# ID Title Solved by Difficulty
1 100 The 3n + 1 problem 26485 1
2 102 Ecological Bin Packing 10608 2
3 10071 Back to High School Physics 9554 3
4 10055 Hashmat the Brave Warrior 9432 3
5 272 TEX Quotes 8192 3
6 458 The Decoder 7289 4
7 136 Ugly Numbers 6729 4
8 10038 Jolly Jumpers 6319 4
9 10035 Primary Arithmetic 6268 4
10 10018 Reverse and Add 6061 4
11 108 Maximum Sum 6022 4
12 113 Power of Cryptography 5804 5
13 494 Kindergarten Counting Game 5784 5
14 299 Train Swapping 5752 5
15 10082 WERTYU 5481 5
16 101 The Blocks Problem 5225 5
17 591 Box of Bricks 5113 5
18 10008 What's Cryptanalysis? 4942 5
19 10300 Ecological Premium 4839 5
20 575 Skew Binary 4732 6
21 369 Combinations 4543 6
22 151 Power Crisis 4470 6
23 382 Perfection 4393 6
24 10370 Above Average 4377 6
25 160 Factors and Factorials 4314 6
26 10189 Minesweeper 4303 6
27 579 ClockHands 4293 6
28 264 Count on Cantor 4237 6
29 424 Integer Inquiry 4214 6
30 499 What's The Frequency, Kenneth? 4194 6
31 10110 Light, More Light 4189 6
32 541 Error Correction 4096 6
33 543 Goldbach's Conjecture 4021 7
34 10004 Bicoloring 3939 7
35 10107 What is the Median? 3891 7
36 374 Big Mod 3876 7
37 686 Goldbach's Conjecture (II) 3852 7
38 105 The Skyline Problem 3839 7
39 495 Fibonacci Freeze 3827 7
40 483 Word Scramble 3793 7
41 10041 Vito's Family 3785 7
42 10019 Funny Encryption Method 3773 7
43 256 Quirksome Squares 3713 7
44 138 Street Numbers 3661 7
45 10079 Pizza Cutting 3627 7
46 530 Binomial Showdown 3609 7
47 10696 f91 3552 7
48 111 History Grading 3533 7
49 10340 All in All 3501 8
50 10783 Odd Sum 3500 8
51 476 Points in Figures: Rectangles 3481 8
52 344 Roman Digititis 3443 8
53 673 Parentheses Balance 3436 8
54 10346 Peter's Smoke 3367 8
55 120 Stacks of Flapjacks 3359 8
56 10469 To Carry or not to Carry 3338 8
57 10127 Ones 3329 8
58 492 Pig-Latin 3265 8
59 438 The Circumference of the Circle 3252 8
60 10327 Flip Sort 3214 8
61 401 Palindromes 3212 8
62 10050 Hartals 3211 8
63 103 Stacking Boxes 3207 8
64 324 Factorial Frequencies 3191 8
65 146 ID Codes 3138 8
66 350 Pseudo-Random Numbers 3115 9
67 10106 Product 3083 9
68 10222 Decode the Mad man 3037 9
69 10006 Carmichael Numbers 3036 9
70 568 Just the Facts 3033 9
71 440 Eeny Meeny Moo 3023 9
72 305 Joseph 2986 9
73 10405 Longest Common Subsequence 2954 9
74 583 Prime Factors 2952 9
75 484 The Department of Redundancy Department 2947 9
76 10302 Summation of Polynomials 2934 9
77 477 Points in Figures: Rectangles and Circles 2933 9
78 412 Pi 2898 9
79 446 Kibbles ``n'' Bits ``n'' Bits ``n'' Bits 2890 9
80 406 Prime Cuts 2885 9
81 10260 Soundex 2848 9
82 640 Self Numbers 2846 9
83 572 Oil Deposits 2835 9
84 294 Divisors 2832 9
85 118 Mutant Flatworld Explorers 2816 9
86 107 The Cat in the Hat 2791 9
87 445 Marvelous Mazes 2775 10
88 112 Tree Summing 2755 10
89 694 The Collatz Sequence 2741 10
90 706 LCD Display 2736 10
91 10013 Super long sums 2702 10
92 439 Knight Moves 2699 10
93 443 Humble Numbers 2680 10
94 674 Coin Change 2644 10
95 10812 Beat the Spread! 2596 10
96 371 Ackermann Functions 2573 10
97 834 Continued Fractions 2565 10
98 119 Greedy Gift Givers 2552 10
99 10220 I Love Big Numbers ! 2532 10
100 386 Perfect Cubes 2529 10
101 167 The Sultan's Successors 2484 11
102 444 Encoder and Decoder 2477 11
103 713 Adding Reversed Numbers 2471 11
104 195 Anagram 2464 11
105 392 Polynomial Showdown 2458 11
106 10424 Love Calculator 2453 11
107 190 Circle Through Three Points 2430 11
108 291 The House Of Santa Claus 2425 11
109 10161 Ant on a Chessboard 2410 11
110 489 Hangman Judge 2373 11
111 128 Software CRC 2359 11
112 133 The Dole Queue 2334 11
113 490 Rotating Sentences 2323 11
114 10003 Cutting Sticks 2312 11
115 573 The Snail 2277 12
116 10098 Generating Fast, Sorted Permutation 2266 12
117 488 Triangle Wave 2252 12
118 408 Uniform Generator 2243 12
119 10324 Zeros and Ones 2225 12
120 10235 Simply Emirp 2220 12
121 441 Lotto 2200 12
122 106 Fermat vs. Pythagoras 2196 12
123 414 Machined Surfaces 2181 12
124 623 500! 2174 12
125 10323 Factorial! You Must be Kidding!!! 2141 12
126 576 Haiku Review 2138 12
127 200 Rare Order 2119 12
128 10209 Is This Integration ? 2118 13
129 10252 Common Permutation 2114 13
130 10432 Polygon Inside A Circle 2108 13
131 10062 Tell me the frequencies! 2101 13
132 116 Unidirectional TSP 2076 13
133 536 Tree Recovery 2046 13
134 10473 Simple Base Conversion 2034 13
135 10131 Is Bigger Smarter? 2017 13
136 847 A Multiplication Game 2012 13
137 10699 Count the factors 2010 13
138 104 Arbitrage 2005 13
139 10924 Prime Words 2004 13
140 417 Word Index 1992 13
141 156 Ananagrams 1986 13
142 496 Simply Subsets 1982 13
143 10409 Die Game 1982 13
144 478 Points in Figures: Rectangles, Circles, Triangles 1973 13
145 10530 Guessing Game 1966 13
146 10929 You can say 11 1963 13
147 621 Secret Research 1960 14
148 10195 The Knights Of The Round Table 1960 14
149 10338 Mischievous Children 1954 14
150 10066 The Twin Towers 1935 14
151 130 Roman Roulette 1933 14
152 352 The Seasonal War 1929 14
153 10921 Find the Telephone 1921 14
154 400 Unix ls 1914 14
155 10579 Fibonacci Numbers 1849 14
156 10192 Vacation 1843 14
157 10515 Powers Et Al. 1829 14
158 117 The Postal Worker Rings Once 1827 14
159 10000 Longest Paths 1822 15
160 147 Dollars 1805 15
161 846 Steps 1804 15
162 10550 Combination Lock 1803 15
163 155 All Squares 1797 15
164 191 Intersection 1796 15
165 10104 Euclid Problem 1796 15
166 10499 The Land of Justice 1762 15
167 10591 Happy Number 1744 15
168 10137 The Trip 1733 15
169 122 Trees on the level 1729 15
170 121 Pipe Fitters 1714 15
171 10310 Dog and Gopher 1714 15
172 10193 All You Need Is Love 1691 16
173 10305 Ordering Tasks 1689 16
174 10034 Freckles 1679 16
175 357 Let Me Count The Ways 1653 16
176 389 Basically Speaking 1652 16
177 10334 Ray Through Glasses 1637 16
178 10931 Parity 1634 16
179 10010 Where's Waldorf? 1615 16
180 271 Simply Syntax 1604 17
181 10099 The Tourist Guide 1604 17
182 300 Maya Calendar 1601 17
183 10450 World Cup Noise 1591 17
184 532 Dungeon Master 1590 17
185 562 Dividing coins 1585 17
186 514 Rails 1571 17
187 498 Polly the Polynomial 1569 17
188 612 DNA Sorting 1561 17
189 10105 Polynomial Coefficients 1560 17
190 534 Frogger 1555 17
191 10282 Babelfish 1555 17
192 594 One Little, Two Little, Three Little Endians 1549 17
193 348 Optimal Array Multiplication Sequence 1546 17
194 442 Matrix Chain Multiplication 1539 17
195 336 A Node Too Far 1532 17
196 10015 Joseph's Cousin 1521 17
197 10789 Prime Frequency 1507 18
198 10033 Interpreter 1505 18
199 10168 Summation of Four Primes 1499 18
200 340 Master-Mind Hints 1496 18
201 144 Student Grants 1482 18
202 10042 Smith Numbers 1477 18
203 154 Recycling 1460 18
204 10533 Digit Primes 1456 18
205 10420 List of Conquests 1455 18
206 109 SCUD Busters 1446 18
207 740 Baudot Data Communication Code 1431 19
208 10361 Automatic Poetry 1418 19
209 10394 Twin Primes 1417 19
210 216 Getting in Line 1413 19
211 544 Heavy Cargo 1406 19
212 10183 How Many Fibs? 1396 19
213 378 Intersecting Lines 1395 19
214 10286 Trouble with a Pentagon 1393 19
215 624 CD 1383 19
216 10074 Take the Land 1382 19
217 11000 Bee 1381 19
218 661 Blowing Fuses 1374 19
219 10922 2 the 9s 1374 19
220 10116 Robot Motion 1371 19
221 10608 Friends 1369 19
222 278 Chess 1367 19
223 10295 Hay Points 1365 19
224 10336 Rank the Languages 1359 19
225 537 Artificial Intelligence? 1353 20
226 10221 Satellites 1351 20
227 642 Word Amalgamation 1349 20
228 10191 Longest Nap 1339 20
229 11172 Relational Operator 1334 20
230 10276 Hanoi Tower Troubles Again! 1323 20
231 587 There's treasure everywhere! 1321 20
232 10970 Big Chocolate 1320 20
233 524 Prime Ring Problem 1316 20
234 10219 Find the ways ! 1316 20
235 343 What Base Is This? 1311 20
236 516 Prime Land 1311 20
237 10152 ShellSort 1300 20
238 315 Network 1294 20
239 574 Sum It Up 1292 20
240 567 Risk 1289 21
241 474 Heads / Tails Probability 1287 21
242 355 The Bases Are Loaded 1285 21
243 10049 Self-describing Sequence 1273 21
244 10070 Leap Year or Not Leap Year and ... 1272 21
245 10182 Bee Maja 1267 21
246 10223 How many nodes ? 1262 21
247 636 Squares (III) 1250 21
248 202 Repeating Decimals 1247 21
249 10130 SuperSale 1245 21
250 10196 Check The Check 1243 21
251 10190 Divide, But Not Quite Conquer! 1241 21
252 10198 Counting 1241 21
253 123 Searching Quickly 1239 21
254 729 The Hamming Distance Problem 1207 22
255 10297 Beavergnaw 1206 22
256 10700 Camel trading 1195 22
257 320 Border 1189 22
258 465 Overflow 1187 22
259 497 Strategic Defense Initiative 1187 22
260 153 Permalex 1186 22
261 739 Soundex Indexing 1181 22
262 637 Booklet Printing 1177 23
263 10067 Playing with Wheels 1177 23
264 124 Following Orders 1169 23
265 409 Excuses, Excuses! 1169 23
266 423 MPI Maelstrom 1163 23
267 422 Word-Search Wonder 1156 23
268 459 Graph Connectivity 1153 23
269 486 English-Number Translator 1149 23
270 10026 Shoemaker's Problem 1146 23
271 10611 The Playboy Chimp 1140 23
272 253 Cube painting 1139 23
273 10474 Where is the Marble? 1135 23
274 10701 Pre, in and post 1132 23
275 10048 Audiophobia 1128 23
276 482 Permutation Arrays 1127 24
277 555 Bridge Hands 1121 24
278 10509 R U Kidding Mr. Feynman! 1120 24
279 10077 The Stern-Brocot Number System 1118 24
280 311 Packets 1113 24
281 10784 Diagonal 1113 24
282 10258 Contest Scoreboard 1111 24
283 485 Pascal's Triangle of Death 1109 24
284 748 Exponentiation 1105 24
285 413 Up and Down Sequences 1103 24
286 531 Compromise 1102 24
287 558 Wormholes 1102 24
288 10573 Geometry Paradox 1102 24
289 10945 Mother bear 1102 24
290 145 Gondwanaland Telecom 1094 24
291 10407 Simple division 1094 24
292 10170 The Hotel with Infinite Rooms 1086 24
293 114 Simulation Wizardry 1080 25
294 10025 The ? 1 ? 2 ? ... ? n = k problem 1078 25
295 10242 Fourth Point !! 1078 25
296 201 Squares 1077 25
297 10465 Homer Simpson 1076 25
298 297 Quadtrees 1073 25
299 326 Extrapolation Using a Difference Table 1073 25
300 10102 The path in the colored field 1071 25
301 170 Clock Patience 1063 25
302 10179 Irreducable Basic Fractions 1062 25
303 10162 Last Digit 1061 25
304 161 Traffic Lights 1058 25
305 140 Bandwidth 1053 25
306 10036 Divisibility 1052 25
307 10487 Closest Sums 1049 25
308 356 Square Pegs And Round Holes 1045 25
309 231 Testing the CATCHER 1037 26
310 10622 Perfect P-th Powers 1034 26
311 10678 The Grazing Cow 1028 26
312 784 Maze Exploration 1027 26
313 10009 All Roads Lead Where? 1023 26
314 10285 Longest Run on a Snowboard 1015 26
315 10056 What is the Probability ? 1010 26
316 10139 Factovisors 1010 26
317 10347 Medians 1009 26
318 10489 Boxes of Chocolates 1009 26
319 639 Don't Get Rooked 1007 26
320 615 Is It A Tree? 1006 26
321 836 Largest Submatrix 1006 26
322 10642 Can You Solve It? 1003 26
323 539 The Settlers of Catan 1001 26
324 701 The Archeologists' Dilemma 1001 26
325 10684 The jackpot 1001 26
326 10451 Ancient Village Sports 994 27
327 115 Climbing Trees 993 27
328 10703 Free spots 993 27
329 10427 Naughty Sleepy Boys 984 27
330 10633 Rare Easy Problem 981 27
331 325 Identifying Legal Pascal Real Constants 977 27
332 166 Making Change 973 27
333 455 Periodic Strings 973 27
334 152 Tree's a Crowd 971 27
335 275 Expanding Fractions 970 27
336 507 Jill Rides Again 968 27
337 10408 Farey sequences 967 27
338 10502 Counting Rectangles 967 27
339 10014 Simple calculations 964 27
340 384 Slurpys 962 28
341 10093 An Easy Problem! 961 28
342 125 Numbering Paths 958 28
343 141 The Spot Game 958 28
344 10125 Sumsets 958 28
345 10229 Modular Fibonacci 957 28
346 437 The Tower of Babylon 953 28
347 333 Recognizing Good ISBNs 952 28
348 10878 Decode the tape 949 28
349 10815 Andy's First Dictionary 944 28
350 10188 Automated Judge Script 940 28
351 10267 Graphical Editor 940 28
352 608 Counterfeit Dollar 934 28
353 110 Meta-Loopless Sorts 928 29
354 193 Graph Coloring 924 29
355 10299 Relatives 919 29
356 628 Passwords 916 29
357 10491 Cows and Cars 916 29
358 10365 Blocks 914 29
359 10080 Gopher II 913 29
360 580 Critical Mass 910 29
361 337 Interpreting Control Sequences 907 29
362 10020 Minimal coverage 902 29
363 164 String Computer 900 29
364 10714 Ants 900 29
365 377 Cowculations 899 29
366 10583 Ubiquitous Religions 899 29
367 700 Date Bugs 898 29
368 10176 Ocean Deep ! - Make it shallow !! 896 30
369 450 Little Black Book 890 30
370 436 Arbitrage (II) 885 30
371 10490 Mr. Azad and his Son!!!!! 884 30
372 10281 Average Speed 882 30
373 280 Vertex 879 30
374 10007 Count the Trees 877 30
375 10140 Prime Distance 873 30
376 725 Division 871 30
377 793 Network Connections 871 30
378 10298 Power Strings 869 30
379 10452 Marcus, help! 866 31
380 10404 Bachet's Game 861 31
381 10100 Longest Match 859 31
382 11185 Ternary 859 31
383 619 Numerically Speaking 854 31
384 10205 Stack 'em Up 853 31
385 644 Immediate Decodability 849 31
386 10508 Word Morphing 849 31
387 542 France '98 848 31
388 10673 Play with Floor and Ceil 848 31
389 127 ``Accordian'' Patience 844 31
390 571 Jugs 844 31
391 332 Rational Numbers from Repeating Fractions 841 31
392 10359 Tiling 839 32
393 10078 The Art Gallery 838 32
394 10539 Almost Prime Numbers 832 32
395 696 How Many Knights 831 32
396 10002 Center of Masses 830 32
397 10948 The primary problem 830 32
398 263 Number Chains 824 32
399 353 Pesky Palindromes 821 32
400 712 S-Trees 819 32
401 10656 Maximum Sum (II) 812 33
402 10400 Game Show Math 810 33
403 466 Mirror, Mirror 807 33
404 10115 Automatic Editing 805 33
405 727 Equation 803 33
406 129 Krypton Factor 799 33
407 448 OOPS! 797 33
408 10664 Luggage 796 33
409 232 Crossword Answers 794 33
410 131 The Psychic Poker Player 793 33
411 10129 Play on Words 784 34
412 10194 Football (aka Soccer) 784 34
413 10081 Tight Words 783 34
414 10142 Australian Voting 780 34
415 10363 Tic Tac Toe 780 34
416 10303 How Many Trees? 774 34
417 10397 Connect the Campus 773 34
418 10935 Throwing cards away I 773 34
419 895 Word Problem 772 34
420 10293 Word Length and Frequency 767 35
421 10301 Rings and Glue 764 35
422 679 Dropping Balls 762 35
423 641 Do the Untwist 760 35
424 620 Cellular Structure 755 35
425 10311 Goldbach and Euler 755 35
426 383 Shipping Routes 751 35
427 10790 How Many Points of Intersection? 751 35
428 10954 Add All 746 36
429 126 The Errant Physicist 743 36
430 10800 Not That Kind of Graph 743 36
431 260 Il Gioco dell'X 741 36
432 10415 Eb Alto Saxophone Player 740 36
433 227 Puzzle 739 36
434 10443 Rock, Scissors, Paper 739 36
435 755 487--3279 738 36
436 913 Joana and the Odd Numbers 737 36
437 602 What Day Is It? 734 36
438 10940 Throwing cards away II 734 36
439 681 Convex Hull Finding 730 36
440 301 Transportation 729 36
441 306 Cipher 725 37
442 10112 Myacm Triangles 719 37
443 10341 Solve It 717 37
444 10494 If We Were a Child Again 717 37
445 585 Triangles 716 37
446 750 8 Queens Chess Problem 713 37
447 11044 Searching for Nessy 713 37
448 850 Crypt Kicker II 711 37
449 10315 Poker Hands 705 38
450 10852 Less Prime 705 38
451 10279 Mine Sweeper 704 38
452 394 Mapmaker 702 38
453 10496 Collecting Beepers 700 38
454 10903 Rock-Paper-Scissors Tournament 700 38
455 10283 The Kissing Circles 694 38
456 900 Brick Wall Patterns 691 38
457 460 Overlapping Rectangles 690 38
458 699 The Falling Leaves 687 39
459 402 M*A*S*H 685 39
460 10037 Bridge 684 39
461 10128 Queue 684 39
462 10101 Bangla Numbers 681 39
463 10693 Traffic Volume 679 39
464 825 Walking on the Safe Side 677 39
465 10057 A mid-summer night's dream. 675 39
466 10063 Knuth's Permutation 672 39
467 11059 Maximum Product 672 39
468 10069 Distinct Subsequences 670 40
469 213 Message Decoding 669 40
470 481 What Goes Up 666 40
471 785 Grid Colouring 665 40
472 10344 23 out of 5 664 40
473 10377 Maze Traversal 659 40
474 10551 Basic Remains 658 40
475 11192 Group Reverse 655 40
476 10245 The Closest Pair Problem 654 40
477 10706 Number Sequence 654 40
478 762 We Ship Cheap 651 41
479 10141 Request for Proposal 650 41
480 10600 ACM Contest and Blackout 647 41
481 159 Word Crosses 643 41
482 10810 Ultra-QuickSort 642 41
483 187 Transaction Processing 640 41
484 397 Equation Elation 640 41
485 808 Bee Breeding 640 41
486 861 Little Bishops 640 41
487 188 Perfect Hash 639 41
488 331 Mapping the Swaps 639 41
489 821 Page Hopping 635 42
490 10392 Factoring Large Numbers 633 42
491 469 Wetlands of Florida 632 42
492 839 Not so Mobile 631 42
493 820 Internet Bandwidth 630 42
494 11057 Exact Sum 629 42
495 10054 The Necklace 625 42
496 884 Factorial Factors 618 43
497 10375 Choose and divide 618 43
498 10976 Fractions Again?! 615 43
499 10523 Very Easy !!! 613 43
500 10589 Area 612 43
501 218 Moth Eradication 611 43
502 10519 !! Really Strange !! 608 44
503 10368 Euclid's Game 604 44
504 10918 Tri Tiling 602 44
505 10919 Prerequisites? 601 44
506 134 Loglan-A Logical Language 597 44
507 142 Mouse Clicks 596 44
508 391 Mark-up 594 45
509 10719 Quotient Polynomial 594 45
510 10177 (2/3/4)-D Sqr/Rects/Cubes/Boxes? 593 45
511 10730 Antiarithmetic? 592 45
512 254 Towers of Hanoi 587 45
513 10534 Wavio Sequence 585 45
514 148 Anagram checker 584 45
515 651 Deck 584 45
516 626 Ecosystem 583 45
517 10683 The decadary watch 582 46
518 435 Block Voting 581 46
519 10943 How do you add? 581 46
520 11121 Base -2 581 46
521 630 Anagrams (II) 580 46
522 634 Polygon 579 46
523 10500 Robot maps 579 46
524 737 Gleaming the Cubes 577 46
525 10360 Rat Attack 576 46
526 10287 Gifts in a Hexagonal Box 575 46
527 711 Dividing up 573 46
528 183 Bit Maps 571 46
529 362 18,000 Seconds Remaining 570 46
530 10051 Tower of Cubes 570 46
531 132 Bumpy Objects 569 47
532 10165 Stone Game 568 47
533 10213 How Many Pieces of Land ? 564 47
534 10369 Arctic Network 564 47
535 10916 Factstone Benchmark 564 47
536 10905 Children's Game 562 47
537 416 LED Test 561 47
538 10012 How Big Is It? 561 47
539 10879 Code Refactoring 560 47
540 540 Team Queue 559 47
541 10566 Crossed Ladders 558 47
542 10702 Travelling Salesman 556 48
543 880 Cantor Fractions 554 48
544 429 Word Transformation 553 48
545 10596 Morning Walk 551 48
546 10249 The Grand Dinner 550 48
547 10422 Knights in FEN 550 48
548 535 Globetrotter 548 48
549 10001 Garden of Eden 547 48
550 10326 The Polynomial Equation 547 48
551 703 Triple Ties: The Organizer's Nightmare 546 49
552 184 Laser Lines 544 49
553 10493 Cats, with or without Hats 544 49
554 10393 The One-Handed Typist 542 49
555 11005 Cheapest Base 539 49
556 379 Hi-Q 538 49
557 617 Nonstop Travel 537 49
558 714 Copying Books 536 49
559 10065 Useless Tile Packers 536 49
560 11063 B2-Sequence 536 49
561 10016 Flip-Flop the Squarelotron 534 50
562 10651 Pebble Solitaire 534 50
563 10803 Thunder Mountain 534 50
564 10364 Square 532 50
565 11069 A Graph Problem 532 50
566 601 The PATH 530 50
567 10813 Traditional BINGO 530 50
568 434 Matty's Blocks 529 50
569 10680 LCM 527 50
570 10930 A-Sequence 527 50
571 10653 Bombs! NO they are Mines!! 526 50
572 10210 Romeo and Juliet ! 525 50
573 10926 How Many Dependencies? 525 50
574 11040 Add bricks in the wall 525 50
575 10199 Tourist Guide 523 51
576 10908 Largest Square 523 51
577 550 Multiplying by Rotation 521 51
578 590 Always on the run 516 51
579 208 Firetruck 515 51
580 10374 Election 514 52
581 10667 Largest Block 514 52
582 10200 Prime Time 513 52
583 10330 Power Transmission 512 52
584 10518 How Many Calls? 511 52
585 10147 Highways 510 52
586 273 Jack Straws 508 52
587 347 Run, Run, Runaround Numbers 508 52
588 10910 Marks Distribution 508 52
589 10061 How many zero's and how many digits ? 506 52
590 10088 Trees on My Island 506 52
591 855 Lunch in Grid City 505 52
592 10849 Move the bishop 505 52
593 10507 Waking up brain 502 53
594 10946 You want what filled? 502 53
595 165 Stamps 501 53
596 454 Anagrams 501 53
597 10306 e-Coins 501 53
598 327 Evaluating Simple C Expressions 499 53
599 10171 Meeting Prof. Miguel... 498 53
600 10791 Minimum Sum LCM 497 53
601 10044 Erdos Numbers 496 53
602 10763 Foreign Exchange 495 54
603 688 Mobile Phone Coverage 494 54
604 10739 String to Palindrome 493 54
605 10880 Colin and Ryan 490 54
606 10780 Again Prime? No Time. 489 54
607 10371 Time Zones 488 54
608 843 Crypt Kicker 485 55
609 10620 A Flea on a Chessboard 485 55
610 318 Domino Effect 483 55
611 471 Magic Numbers 482 55
612 10602 Editor Nottobad 481 55
613 11074 Draw Grid 481 55
614 11015 05-2 Rendezvous 479 55
615 186 Trip Routing 478 55
616 10391 Compound Words 477 56
617 10484 Divisibility of Factors 477 56
618 381 Making the Grade 476 56
619 677 All Walks of length ``n'' from the first node 476 56
620 10446 The Marriage Interview :-) 476 56
621 10773 Back to Intermediate Math 476 56
622 255 Correct Move 475 56
623 10527 Persistent Numbers 475 56
624 10202 Pairsumonious Numbers 474 56
625 10497 Sweet Child Makes Trouble 474 56
626 457 Linear Cellular Automata 473 56
627 556 Amazing 473 56
628 741 Burrows Wheeler Decoder 472 56
629 796 Critical Links 472 56
630 10304 Optimal Binary Search Tree 471 56
631 743 The MTM Machine 470 56
632 10689 Yet another Number Sequence 469 56
633 526 String Distance and Transform Process 467 57
634 10268 498-bis 467 57
635 10271 Chopsticks 467 57
636 162 Beggar My Neighbour 465 57
637 10126 Zipf's Law 465 57
638 627 The Net 464 57
639 584 Bowling 462 57
640 10705 The Fun Number System 462 57
641 10522 Height to Area 460 58
642 11001 Necklace 460 58
643 11150 Cola 459 58
644 10738 Riemann vs Mertens 458 58
645 705 Slash Maze 457 58
646 10820 Send a Table 457 58
647 622 Grammar Evaluation 456 58
648 10928 My Dear Neighbours 456 58
649 245 Uncompress 454 58
650 314 Robot 454 58
651 10005 Packing polygons 454 58
652 10617 Again Palindrome 451 59
653 638 Finding Rectangles 450 59
654 704 Colour Hash 450 59
655 10060 A hole to catch a man 450 59
656 10669 Three powers 450 59
657 10920 Spiral Tap 449 59
658 143 Orchard Trees 448 59
659 538 Balancing Bank Accounts 446 59
660 10132 File Fragmentation 444 60
661 10650 Determinate Prime 444 60
662 517 Word 442 60
663 551 Nesting a Bunch of Brackets 442 60
664 588 Video Surveillance 440 60
665 10307 Killing Aliens in Borg Maze 440 60
666 10309 Turn the Lights Off 439 60
667 586 Instant Complexity 438 60
668 10801 Lift Hopping 438 60
669 10090 Marbles 437 61
670 10354 Avoiding Your Boss 436 61
671 10925 Krakovia 436 61
672 168 Theseus and the Minotaur 435 61
673 209 Triangular Vertices 435 61
674 468 Key to Success 434 61
675 547 DDF 433 61
676 10022 Delta-wave 432 61
677 10721 Bar Codes 432 61
678 10337 Flight Planner 431 61
679 10460 Find the Permuted String 431 61
680 10865 Brownie Points 431 61
681 196 Spreadsheet 428 62
682 10233 Dermuba Triangle 428 62
683 10226 Hardwood Species 427 62
684 10871 Primed Subsequence 426 62
685 11039 Building designing 425 62
686 222 Budget Travel 424 62
687 10197 Learning Portuguese 422 63
688 290 Palindroms <---> smordnilaP 420 63
689 10120 Gift?! 420 63
690 756 Biorhythms 419 63
691 654 Ratio 418 63
692 833 Water Falls 418 63
693 10178 Count the Faces. 417 64
694 10503 The dominoes solitaire 417 64
695 11137 Ingenuous Cubrency 417 64
696 10541 Stripe 415 64
697 10154 Weights and Measures 414 64
698 418 Molecules 413 64
699 632 Compression (II) 413 64
700 10227 Forests 412 64
701 647 Chutes and Ladders 411 64
702 462 Bridge Hand Evaluator 410 65
703 296 Safebreaker 409 65
704 380 Call Forwarding 409 65
705 11219 How old are you? 409 65
706 501 Black Box 408 65
707 598 Bundling Newspapers 408 65
708 10896 Known Plaintext Attack 407 65
709 270 Lining Up 403 66
710 10201 Adventures in Moving - Part IV 403 66
711 10308 Roads in the North 403 66
712 10290 {Sum+=i++} to Reach N 402 66
713 10356 Rough Roads 402 66
714 321 The New Villa 401 66
715 10774 Repeated Josephus 400 66
716 10994 Simple Addition 399 66
717 177 Paper Folding 397 67
718 403 Postscript 397 67
719 10554 Calories from Fat 395 67
720 10092 The Problem with the Problem Setter 393 67
721 10325 The Lottery 393 67
722 616 Coconuts, Revisited 392 68
723 763 Fibinary Numbers 390 68
724 393 The Doors 389 68
725 10677 Base Equality 389 68
726 10776 Determine The Combination 389 68
727 815 Flooded! 388 68
728 220 Othello 387 68
729 11152 Colourful Flowers 387 68
730 10254 The Priest Mathematician 386 69
731 157 Route Finding 385 69
732 10284 Chessboard in FEN 385 69
733 10892 LCM Cardinality 384 69
734 139 Telephone Tangles 382 69
735 10453 Make Palindrome 382 69
736 10646 What is the Card? 382 69
737 10717 Mint 382 69
738 10585 Center of symmetry 381 70
739 10440 Ferry Loading II 376 70
740 11078 Open Credit System 374 71
741 10113 Exchange Rates 373 71
742 10312 Expression Bracketing 373 71
743 172 Calculator Language 372 71
744 11089 Fi-binary Number 370 72
745 10029 Edit Step Ladders 369 72
746 10543 Traveling Politician 369 72
747 10610 Gopher and Hawks 369 72
748 313 Intervals 367 72
749 897 Anagrammatic Primes 365 73
750 670 The dog task 364 73
751 10959 The Party, Part I 363 73
752 665 False coin 362 73
753 10625 GNU = GNU'sNotUnix 362 73
754 11105 Semi-prime H-numbers 362 73
755 702 The Vindictive Coach 361 73
756 10150 Doublets 359 74
757 10856 Recover Factorial 359 74
758 10387 Billiard 358 74
759 341 Non-Stop Travel 357 74
760 10603 Fill 357 74
761 10963 The Swallowing Ground 357 74
762 812 Trade on Verweggistan 356 74
763 10851 2D Hieroglyphs decoder 356 74
764 10894 Save Hridoy 355 75
765 10174 Couple-Bachelor-Spinster Numbers. 354 75
766 10313 Pay the Price 354 75
767 11115 Uncle Jack 354 75
768 137 Polygons 353 75
769 345 It's Ir-Resist-Able! 353 75
770 10181 15-Puzzle Problem 353 75
771 10806 Dijkstra, Dijkstra. 353 75
772 11220 Decoding the message. 353 75
773 11068 An Easy Task 352 75
774 181 Hearts 351 75
775 10718 Bit Mask 351 75
776 657 The die is cast 350 76
777 10401 Injured Queen Problem 350 76
778 11076 Add Again 350 76
779 11067 Little Red Riding Hood 348 76
780 10891 Game of Sum 347 76
781 614 Mapping the Route 345 77
782 10637 Coprimes 345 77
783 10679 I Love Strings!! 345 77
784 11173 Grey Codes 345 77
785 493 Rational Spiral 342 77
786 10986 Sending email 342 77
787 10912 Simple Minded Hashing 341 78
788 11056 Formula 1 341 78
789 545 Heads 339 78
790 10212 The Last Non-zero Digit. 339 78
791 10672 Marbles on a tree 339 78
792 10895 Matrix Transpose 339 78
793 548 Tree 338 78
794 871 Counting Cells in a Blob 338 78
795 11085 Back to the 8-Queens 337 79
796 427 FlatLand Piano Movers 336 79
797 710 The Game 336 79
798 11003 Boxes 336 79
799 388 Galactic Import 335 79
800 339 SameGame Simulation 334 79
801 10586 Polynomial Remains 332 80
802 10947 Bear with me, again.. 332 80
803 11151 Longest Palindrome 331 80
804 11054 Wine trading in Gergovia 330 80
805 10616 Divisible Group Sums 328 81
806 349 Transferable Voting (II) 327 81
807 10382 Watering Grass 327 81
808 10576 Y2K Accounting Bug 327 81
809 10742 The New Rule in Euphomia 327 81
810 10047 The Monocycle 326 81
811 10482 The Candyman Can 326 81
812 776 Monkeys in a Regular Forest 325 81
813 10520 Determine it 325 81
814 10578 The Game of 31 325 81
815 668 Parliament 324 82
816 589 Pushing Boxes 323 82
817 732 Anagrams by Stack 323 82
818 10075 Airlines 323 82
819 150 Double Time 322 82
820 135 No Rectangles 320 83
821 10528 Major Scales 320 83
822 10830 A New Function 320 83
823 447 Population Explosion 319 83
824 565 Pizza Anyone? 318 83
825 11064 Number Theory 318 83
826 10670 Work Reduction 317 84
827 10978 Let's Play Magic! 317 84
828 557 Burger 316 84
829 10259 Hippity Hopscotch 316 84
830 10406 Cutting tabletops 316 84
831 10842 Traffic Flow 316 84
832 179 Code Breaking 315 84
833 865 Substitution Cypher 314 84
834 11042 Complex, difficult and complicated 314 84
835 11244 Counting Stars 313 85
836 10911 Forming Quiz Teams 311 85
837 11012 Cosmic Cabbages 311 85
838 302 John's trip 310 85
839 892 Finding words 310 85
840 10532 Combination! Once Again 310 85
841 10536 Game of Euler 310 85
842 10662 The Wedding 310 85
843 10720 Graph Construction 310 85
844 467 Synching Signals 309 86
845 10635 Prince and Princess 309 86
846 10296 Jogging Trails 308 86
847 10991 Region 307 86
848 520 Append 306 87
849 10574 Counting Rectangles 305 87
850 11233 Deli Deli 305 87
851 533 Equation Solver 304 87
852 10058 Jimmi's Riddles 304 87
853 10264 The Most Potent Corner 304 87
854 10333 The Tower of ASCII 304 87
855 10821 Constructing BST 304 87
856 10017 The Never Ending Towers of Hanoi 303 87
857 10261 Ferry Loading 302 88
858 11062 Andy's Second Dictionary 301 88
859 11207 The easiest way 301 88
860 633 A Chess Knight 300 88
861 10250 The Other Two Trees 300 88
862 10681 Teobaldo's Trip 300 88
863 993 Product of digits 299 89
864 10097 The Color Game 299 89
865 10862 Connect the Cable Wires 299 89
866 11045 My T-shirt suits me 298 89
867 10094 Place the Guards 297 89
868 11223 O: dah dah dah! 297 89
869 338 Long Multiplication 296 89
870 521 Gossiping 296 89
871 10167 Birthday Cake 296 89
872 10217 A Dinner with Schwarzenegger!!! 296 89
873 10555 Dead Fraction 296 89
874 10351 Cutting Diamonds 295 90
875 10083 Division 294 90
876 10203 Snow Clearing 294 90
877 171 Car Trialling 292 91
878 10957 So Doku Checker 292 91
879 276 Egyptian Multiplication 289 92
880 10771 Barbarian tribes 289 92
881 242 Stamps and Envelope Size 288 92
882 10164 Number Game 288 92
883 10785 The Mad Numerologist 288 92
884 11222 Only I did it! 288 92
885 10410 Tree Reconstruction 287 92
886 10466 How Far? 287 92
887 346 Getting Chorded 286 93
888 529 Addition Chains 286 93
889 10685 Nature 285 93
890 11086 Composite Prime 285 93
891 185 Roman Numerals 284 93
892 753 A Plug for UNIX 284 93
893 824 Coast Tracker 284 93
894 10158 War 284 93
895 10564 Paths through the Hourglass 283 94
896 10480 Sabotage 282 94
897 428 Swamp County Roofs 280 95
898 662 Fast Food 280 95
899 718 Skyscraper Floors 280 95
900 385 DNA Translation 279 95
901 523 Minimum Transport Cost 279 95
902 10232 Bit-wise Sequence 279 95
903 518 Time 278 95
904 10146 Dictionary 278 95
905 735 Dart-a-Mania 277 96
906 10557 XYZZY 277 96
907 10562 Undraw the Trees 277 96
908 10759 Dice Throwing 276 96
909 410 Station Balance 275 96
910 10187 From Dusk Till Dawn 275 96
911 11058 Encoding 275 96
912 10043 Chainsaw Massacre 274 97
913 10263 Railway 274 97
914 11093 Just Finish it up 274 97
915 452 Project Scheduling 273 97
916 10257 Dick and Jane 273 97
917 10634 Say NO to Memorization 273 97
918 10716 Evil Straw Warts Live 273 97
919 375 Inscribed Circles and Isosceles Triangles 272 97
920 10787 Modular Equations 272 97
921 10792 The Laurel-Hardy Story 272 97
922 10823 Of Circles and Squares 272 97
923 10510 Cactus 271 98
924 10328 Coin Toss 270 98
925 603 Parking Lot 269 98
926 10964 Strange Planet 269 98
927 308 Tin Cutter 268 99
928 604 The Boggle Game 267 99
929 10668 Expanding Rods 267 99
930 178 Shuffling Patience 266 100
931 433 Bank (Not Quite O.C.R.) 266 100
932 10419 Sum-up the Primes 266 100
933 10666 The Eurocup is Here! 266 100
934 10733 The Colored Cubes 266 100
935 10396 Vampire Numbers 265 100
936 10855 Rotated square 265 100
937 211 The Domino Effect 264 100
938 613 Numbers That Count 264 100
939 10495 Conic Distance 264 100
940 10626 Buying Coke 264 100
941 10902 Pick-up Sticks 264 100
942 11110 Equidivisions 264 100
943 198 Peter's Calculator 263 101
944 10917 Walk Through the Forest 263 101
945 592 Island of Logic 262 101
946 10814 Simplifying Fractions 262 101
947 837 Light and Transparencies 261 101
948 10111 Find the Winning Move 261 101
949 10428 The Roots 261 101
950 11029 Leading and Trailing 261 101
951 11221 Magic square palindromes. 261 101
952 10039 Railroads 259 102
953 158 Calendar 258 103
954 852 Deciding victory in Go 258 103
955 10505 Montesco vs Capuleto 258 103
956 10350 Liftless EME 257 103
957 10567 Helping Fill Bates 257 103
958 10816 Travel in Desert 257 103
959 10827 Maximum sum on a torus 257 103
960 10318 Security Panel 256 103
961 11100 The Trip, 2007 256 103
962 599 The Forrest for the Trees 255 104
963 10439 Temple of Dune 254 104
964 230 Borrowers 253 105
965 10804 Gopher Strategy 253 105
966 10898 Combo Deal 253 105
967 395 Board Silly 252 105
968 671 Spell checker 252 105
969 11038 How Many O's? 252 105
970 11055 Homogeneous squares 252 105
971 745 Numeric Puzzles Again! 251 106
972 10874 Segments 251 106
973 948 Fibonaccimal Base 250 106
974 10278 Fire Station 248 107
975 10843 Anne's game 248 107
976 174 Strategy 246 108
977 257 Palinwords 246 108
978 561 Jackpot 246 108
979 845 Gas Station Numbers 245 108
980 10316 Airline Hub 245 108
981 10506 The Ouroboros problem 245 108
982 487 Boggle Blitz 244 109
983 10040 Ouroboros Snake 244 109
984 303 Pipe 243 109
985 307 Sticks 243 109
986 10246 Asterix and Obelix 243 109
987 974 Kaprekar Numbers 242 109
988 10688 The Poor Giant 242 109
989 563 Crimewave 241 110
990 10560 Minimum Weight 241 110
991 11026 A Grouping Problem 241 110
992 759 The Return of the Roman Empire 240 110
993 10504 Hidden squares 240 110
994 11133 Eigensequence 240 110
995 10980 Lowest Price in Town 238 111
996 405 Message Routing 237 112
997 10317 Equating Equations 237 112
998 10357 Playball !!! 237 112
999 10547 Hidden Truth in Recurrence 237 112
1000 707 Robbery 236 112
1001 10218 Let's Dance !!! 235 113
1002 10416 Folding My T-Shirt 235 113
1003 11060 Beverages 235 113
1004 215 Spreadsheet Calculator 234 113
1005 505 Moscow time 234 113
1006 869 Airline Comparison 234 113
1007 10215 The Largest/Smallest Box ... 234 113
1008 192 Synchronous Design 233 114
1009 519 Puzzle (II) 233 114
1010 10944 Nuts for nuts.. 232 114
1011 11002 Towards Zero 232 114
1012 10793 The Orc Attack 231 115
1013 10942 Can of Beans 231 115
1014 10086 Test the Rods 230 115
1015 10722 Super Lucky Numbers 230 115
1016 10745 Dominant Strings 230 115
1017 10483 The Sum Equals the Product 229 116
1018 10901 Ferry Loading III 229 116
1019 652 Eight 228 116
1020 10023 Square root 228 116
1021 10339 Watching Watches 228 116
1022 10389 Subway 228 116
1023 10421 Critical Wave 228 116
1024 10900 So you want to be a 2n-aire? 228 116
1025 10915 War on Weather 228 116
1026 11103 WFF 'N PROOF 228 116
1027 425 Enigmatic Encryption 227 117
1028 10349 Antenna Placement 227 117
1029 10593 Kites 227 117
1030 10425 Mobile Destroyer 226 117
1031 10819 Trouble of 13-Dots 226 117
1032 787 Maximum Sub-sequence Product 225 118
1033 10180 Rope Crisis in Ropeland! 225 118
1034 10288 Coupons 225 118
1035 10655 Contemplation - Algebra 225 118
1036 274 Cat and Mouse 224 118
1037 10243 Fire! Fire!! Fire!!! 224 118
1038 618 Doing Windows 222 119
1039 11049 Basic wall maze 222 119
1040 11108 Tautology 222 119
1041 298 Race Tracks 220 120
1042 10977 Enchanted Forest 220 120
1043 902 Password Search 219 121
1044 10537 The Toll! Revisited 219 121
1045 10710 Chinese Shuffle 219 121
1046 11022 String Factoring 219 121
1047 268 Double Trouble 218 121
1048 672 Gangsters 218 121
1049 10085 The most distant state 218 121
1050 11203 Can you decide it for ME? 218 121
1051 10021 Cube in the labirint 217 122
1052 10390 Bean Counting 217 122
1053 10535 Shooter 217 122
1054 658 It's not a Bug, it's a Feature! 216 123
1055 726 Decode 216 123
1056 10329 Combinatorial Expression 216 123
1057 10462 Is There A Second Way Left? 216 123
1058 10549 Russian Dolls 216 123
1059 10423 Peter Takes a Tramway 215 123
1060 10477 The Hybrid Knight 215 123
1061 415 Sunrise 214 124
1062 432 Modern Art 214 124
1063 10149 Yahtzee 214 124
1064 10320 Cow Trouble! Help Please!! 214 124
1065 182 Bonus Bonds 213 124
1066 10433 Automorphic Numbers 213 124
1067 10449 Traffic 213 124
1068 10459 The Tree Root 213 124
1069 10570 Meeting with Aliens 213 124
1070 10598 Find the Latitude 213 124
1071 10777 God! Save me 213 124
1072 10854 Number of Paths 213 124
1073 11034 Ferry Loading IV 213 124
1074 10024 Curling up the cube 212 125
1075 10471 Can't be too GREEDY 212 125
1076 10990 Another New Function 212 125
1077 914 Jumping Champion 211 126
1078 10540 Flowers of a Beautiful Mind 211 126
1079 11048 Automatic Correction of Misspellings 211 126
1080 387 A Puzzling Problem 210 126
1081 10118 Free Candies 210 126
1082 10378 Complex Numbers 210 126
1083 11231 Black and white painting 210 126
1084 451 Poker Solitaire Evaluator 209 127
1085 10385 Duathlon 209 127
1086 10746 Crime Wave - The Sequel 209 127
1087 10577 Bounding box 208 127
1088 10897 Travelling Distance 208 127
1089 858 Berry Picking 207 128
1090 312 Crosswords (II) 206 129
1091 10277 Boastin' Red Socks 206 129
1092 10445 Make Polygon 206 129
1093 570 Stats 205 129
1094 810 A Dicey Problem 205 129
1095 10342 Always Late 205 129
1096 10517 Wind of Change! 205 129
1097 10769 Pillars 205 129
1098 10958 How Many Solutions? 205 129
1099 11226 Reaching the fix-point. 205 129
1100 10386 Circles in Triangle 204 130
1101 11070 The Good Old Times 204 130
1102 10134 AutoFish 203 130
1103 10157 Expressions 203 130
1104 10475 Help the Leaders 203 130
1105 10545 Maximal Quadrilateral 203 130
1106 656 Optimal Programs 202 131
1107 10436 Cheapest way 201 132
1108 10609 Fractal 201 132
1109 10761 Broken Keyboard 201 132
1110 464 Sentence/Phrase Generator 200 132
1111 10660 Citizen attention offices 200 132
1112 10690 Expression Again 200 132
1113 11004 Changing Roadmap 200 132
1114 10343 Base64 Decoding 199 133
1115 10488 Swimming Gopher 199 133
1116 10938 Flea circus 199 133
1117 11088 End up with More Teams 199 133
1118 719 Glass Beads 198 134
1119 10464 Big Big Real Numbers 198 134
1120 760 DNA Sequencing 197 134
1121 10114 Loansome Car Buyer 197 134
1122 11130 Billiard bounces 197 134
1123 358 Don't Have A Cow, Dude 196 135
1124 607 Scheduling Lectures 196 135
1125 10269 Adventure of Super Mario 196 135
1126 10604 Chemical Reaction 196 135
1127 10734 Triangle Partitioning 196 135
1128 10927 Bright Lights 196 135
1129 10214 Trees in a Wood. 195 136
1130 10444 Multi-peg Towers of Hanoi 195 136
1131 10698 Football Sort 195 136
1132 10858 Unique Factorization 195 136
1133 10247 Complete Tree Labeling 194 137
1134 10933 Volleyball 194 137
1135 10998 Flipping Colors 194 137
1136 10068 The Treasure Hunt 193 137
1137 10348 Submarines 193 137
1138 10913 Walking on a Grid 193 137
1139 11094 Continents 193 137
1140 11155 Be Efficient 193 137
1141 10173 Smallest Bounding Rectangle 192 138
1142 10556 Biometrics 192 138
1143 309 FORCAL 191 139
1144 10160 Servicing Stations 191 139
1145 10992 The Ghost of Programmers 191 139
1146 10175 Sphere 190 139
1147 10934 Dropping water balloons 190 139
1148 247 Calling Circles 189 140
1149 10138 CDVII 189 140
1150 10426 Knights' Nightmare 189 140
1151 10544 Numbering the Paths 189 140
1152 10860 Many a Little makes a Mickle 189 140
1153 10872 Triangles 189 140
1154 11080 Place the Guards 189 140
1155 149 Forests 188 141
1156 782 Contour Painting 188 141
1157 411 Centipede Collisions 187 142
1158 721 Invitation Cards 187 142
1159 10512 A Day in Math-land 187 142
1160 10587 Mayor's posters 187 142
1161 10624 Super Number 187 142
1162 11099 Next Same-Factored 187 142
1163 10032 Tug of War 186 142
1164 10144 Expression 186 142
1165 10529 Dumb Bones 186 142
1166 10999 Crabbles 186 142
1167 11111 Generalized Matrioshkas 186 142
1168 685 Least Path Cost 185 143
1169 11204 Musical instruments 185 143
1170 559 Squares (II) 184 144
1171 653 Gizilch 184 144
1172 967 Circular 184 144
1173 10802 Lex Smallest Drive 184 144
1174 10136 Chocolate Chip Cookies 183 145
1175 10331 The Flyover Construction 183 145
1176 10461 Difference 182 146
1177 10027 Language Cardinality 181 146
1178 10687 Monitoring the Amazon 180 147
1179 10728 Help! 180 147
1180 866 Intersecting Line Segments 179 148
1181 10236 The Fibonacci Primes 179 148
1182 10516 Another Counting Problem 179 148
1183 593 MBone 178 149
1184 659 Reflections 178 149
1185 10169 Urn-ball Probabilities ! 178 149
1186 10238 Throw the Dice 178 149
1187 10275 Guess the Number! 178 149
1188 10563 Least Squares 178 149
1189 10479 The Hendrie Sequence 177 150
1190 10569 Number Theory 177 150
1191 10889 The Lost Gift 177 150
1192 11077 Find the Permutations 177 150
1193 180 Eeny Meeny 176 150
1194 552 Filling the Gaps 176 150
1195 10831 Gerg's Cake 176 150
1196 625 Compression 175 151
1197 10352 Count the eWords 175 151
1198 10514 River Crossing 175 151
1199 194 Triangle 174 152
1200 335 Processing MX Records 174 152
1201 893 Y3K Problem 174 152
1202 10750 Beautiful Points 174 152
1203 10914 Abundance and Perfect Numbers 174 152
1204 366 Cutting Up 173 153
1205 610 Street Directions 173 153
1206 10366 Faucet Flow 173 153
1207 10072 Bob Laptop Woolmer and Eddie Desktop Barlow 172 154
1208 10239 The Book-shelver's Problem 172 154
1209 11132 Dice from pennies 172 154
1210 991 Safe Salutations 171 155
1211 10442 Basic 171 155
1212 11087 Divisibility Testing 171 155
1213 10228 Star not a Tree? 170 156
1214 259 Software Allocation 169 157
1215 10237 Bishops 169 157
1216 10553 Treasure Map 169 157
1217 10950 Bad Code 169 157
1218 811 The Fortified Forest 168 158
1219 10883 Supermean 168 158
1220 684 Integral Determinant 167 159
1221 10649 Danger Point 167 159
1222 10709 Intersection is Not that Easy 167 159
1223 11230 Annoying painting tool 167 159
1224 11241 Humidex 167 159
1225 10868 Bungee Jumping 166 160
1226 10882 Koerner's Pub 166 160
1227 11028 Sum of Product 166 160
1228 635 Clock solitaire 165 161
1229 10731 Test 165 161
1230 11053 Flavius Josephus Reloaded 165 161
1231 11218 KTV 165 161
1232 11236 Grocery store 165 161
1233 173 Network Wars 164 161
1234 10454 Trexpression 164 161
1235 10575 Polylops 164 161
1236 10932 Calculator 164 161
1237 10123 No Tipping 163 162
1238 10441 Catenyms 163 162
1239 10581 Partitioning for fun and profit 163 162
1240 10744 The Optimal Super-Highway 163 162
1241 328 The Finite State Text Processing Machine 162 163
1242 10559 Blocks 162 163
1243 11202 The least possible effort 162 163
1244 11240 Antimonotonicity 162 163
1245 399 Another Puzzling Problem 161 165
1246 10875 Big Math 161 165
1247 407 Gears on a Board 160 166
1248 10658 ReArrange 160 166
1249 10848 Make Palindrome Checker 160 166
1250 334 Identifying Concurrent Events 159 167
1251 10367 Equations 159 167
1252 10694 Combinatorial Summation 159 167
1253 169 Xenosemantics 158 168
1254 10648 Chocolate Box 157 169
1255 10713 Map 157 169
1256 10877 Diceoids 157 169
1257 11254 Consecutive Integers 157 169
1258 10291 Cut the Legs 155 171
1259 10355 Superman 155 171
1260 10542 Hyper-drive 155 171
1261 10870 Recurrences 155 171
1262 10987 Antifloyd 155 171
1263 10091 The Valentine's Day 154 172
1264 10225 Discrete Logging 154 172
1265 10582 ASCII Labyrinth 154 172
1266 10850 The Gossipy Gossipers Gossip Gossips 154 172
1267 10937 Blackbeard the Pirate 154 172
1268 500 Table 153 173
1269 10592 Freedom Fighter 153 173
1270 11008 Antimatter Ray Clearcutting 153 173
1271 11024 Circular Lock 153 173
1272 11148 Moliu Fractions 153 173
1273 11161 Help My Brother (II) 153 173
1274 430 Swamp County Supervisors 152 174
1275 10045 Echo 152 174
1276 10256 The Great Divide 152 174
1277 11101 Mall Mania 152 174
1278 221 Urban Elevations 151 175
1279 10973 Triangle Counting 151 175
1280 11051 Dihedral groups 151 175
1281 11158 Elegant Permuted Sum 151 175
1282 11232 Cylinder 151 175
1283 856 The Vigenère Cipher 150 177
1284 10230 Savage Garden 150 177
1285 10244 First Love !!! 150 177
1286 10413 Crazy Savages 150 177
1287 10606 Opening Doors 150 177
1288 11032 Function Overloading 150 177
1289 11170 Cos(NA) 150 177
1290 645 File Mapping 149 178
1291 10234 Frequent Substrings 149 178
1292 11138 Nuts and Bolts 149 178
1293 11140 Little Ali's Little Brother! 149 178
1294 175 Keywords 148 179
1295 10741 Magic Cube 148 179
1296 10822 Planet of the Rock, Paper and Scissors 148 179
1297 680 Movement of Reading Head 147 180
1298 10373 The Brick Stops Here 147 180
1299 10740 Not the Best 147 180
1300 10982 Troublemakers 147 180
1301 11239 Open Source 147 180
1302 419 Matching Meetings 146 181
1303 11027 Palindromic Permutation 146 181
1304 390 Letter Sequence Analysis 145 183
1305 10659 Fitting Text into Slides 145 183
1306 10707 2D-Nim 145 183
1307 10832 Yoyodyne 145 183
1308 11246 K-Multiple Free set 145 183
1309 163 City Directions 144 184
1310 757 Gone Fishing 144 184
1311 10890 Maze 144 184
1312 11227 The silver bullet. 144 184
1313 11242 Tour de France 144 184
1314 426 Fifth Bank of Swamp County 143 185
1315 716 Commedia dell' arte 143 185
1316 11136 Hoax or what 143 185
1317 11147 KuPellaKeS BST 143 185
1318 924 Spreading The News 142 187
1319 10124 Subway 142 187
1320 10909 Lucky Number 142 187
1321 669 Defragment 141 188
1322 736 Lost in Space 141 188
1323 10294 Arif in Dhaka (First Love Part 2) 141 188
1324 10412 Big Big Trees 141 188
1325 860 Entropy Text Analyzer 140 189
1326 10011 Where Can You Hide? 140 189
1327 10398 The Golden Pentagon 140 189
1328 11112 Babylonian Roulette 140 189
1329 189 Pascal Program Lengths 139 191
1330 361 Cops and Robbers 139 191
1331 453 Intersecting Circles 139 191
1332 10148 Advertisement 139 191
1333 10468 Rigid Circle Packing 139 191
1334 10807 Prim, Prim. 139 191
1335 663 Sorting Slides 138 192
1336 10590 Boxes of Chocolates Again 138 192
1337 11225 Tarot scores. 138 192
1338 560 Magic 137 193
1339 10723 Cyborg Genes 137 193
1340 10732 The Strange Research 137 193
1341 11072 Points 137 193
1342 176 City Navigation 136 195
1343 250 Pattern Matching Prelims 136 195
1344 10084 Hotter Colder 136 195
1345 10372 Leaps Tall Buildings (in a single bound) 136 195
1346 10430 Dear GOD, Pardon Me 136 195
1347 10457 Magic Car 136 195
1348 10511 Councilling 136 195
1349 10619 Advanced Causal Measurements 136 195
1350 11096 Nails 136 195
1351 10251 Min-Max Cake 135 196
1352 10486 Mountain Village 135 196
1353 10548 Find the Right Changes 135 196
1354 10552 Genealogical Research 135 196
1355 11181 Probability|Given 134 198
1356 708 Dreisam Equations 133 199
1357 10319 Manhattan 133 199
1358 10525 New to Bangladesh? 133 199
1359 10724 Road Construction 133 199
1360 10888 Warehouse 133 199
1361 10273 Eat or Not to Eat? 132 201
1362 10571 Products 132 201
1363 11021 Tribles 132 201
1364 11127 Triple-Free Binary Strings 132 201
1365 566 Adam's Genes 131 202
1366 828 Deciphering Messages 131 202
1367 10417 Gift Exchanging 131 202
1368 10644 Floor Tiles 131 202
1369 11083 Zeroes Revisited 131 202
1370 11180 Base i-1 131 202
1371 449 Majoring in Scales 130 204
1372 515 King 130 204
1373 872 Ordering 130 204
1374 10697 Firemen barracks 130 204
1375 11237 Halloween treats 130 204
1376 795 Sandorf's Cipher 129 205
1377 10076 The Bumpy Robot 129 205
1378 10388 Snap 129 205
1379 10643 Facing Problem With Trees 129 205
1380 10989 Bomb, Divide and Conquer 129 205
1381 10156 Sala-ma-Sond, A Nice Little Pond 128 207
1382 697 Jack and Jill 127 209
1383 758 The Same Game 127 209
1384 10652 Board Wrapping 127 209
1385 10715 Cat 127 209
1386 11247 Income Tax 127 209
1387 239 Tempus et mobilius. Time and motion 126 210
1388 554 Caesar Cypher 126 210
1389 10568 n Group k 126 210
1390 10725 Triangular Square 126 210
1391 11129 An antiarithmetic permutation 126 210
1392 11149 Power of Matrix 126 210
1393 835 Square of Primes 125 212
1394 844 Pousse 125 212
1395 10594 Data Flow 125 212
1396 10747 Maximum Subsequence 125 212
1397 10825 Anagram and Multiplication 125 212
1398 10923 Seven Seas 125 212
1399 240 Variable Radix Huffman Encoding 124 214
1400 962 Taxicab Numbers 124 214
1401 10089 Repackaging 124 214
1402 11047 The Scrooge Co Problem 124 214
1403 926 Walking Around Wisely 123 215
1404 11258 String Partition 123 215
1405 258 Mirror Maze 122 217
1406 10476 Spam or Not Spam 122 217
1407 10599 Robots(II) 122 217
1408 11234 Expressions 122 217
1409 553 Simply proportion 121 219
1410 775 Hamiltonian Cycle 121 219
1411 10601 Cubes 121 219
1412 10817 Headmaster's Headache 121 219
1413 11125 Arrange Some Marbles 121 219
1414 11205 The broken pedometer 121 219
1415 751 Triangle War 120 221
1416 10654 The Uxuhul Voting System 120 221
1417 10145 Lock Manager 119 223
1418 10207 The Unreal Tournament 119 223
1419 10663 Non-Powerful Subsets 119 223
1420 10692 Huge Mods 119 223
1421 10748 Knights Roaming 119 223
1422 695 Placing the Ops 118 224
1423 10799 OOPS! They did it Again... 118 224
1424 10887 Concatenation of Languages 118 224
1425 11106 Rectilinear Polygon 118 224
1426 319 Pendulum 117 226
1427 491 Tile Topology 117 226
1428 10186 Euro Cup 2000 117 226
1429 10345 Cricket/Football Goes Down 117 226
1430 10735 Euler Circuit 117 226
1431 660 Going in circles on Alpha Centauri 116 228
1432 10163 Storage Keepers 116 228
1433 10248 The Integer All-time Champ 116 228
1434 10561 Treblecross 116 228
1435 10621 Jack and Jill 116 228
1436 10665 Diatribe against Pigeonholes 116 228
1437 10764 Signed-digit numbers 116 228
1438 10844 Bloques 116 228
1439 11235 Frequent values 116 228
1440 10253 Series-Parallel Networks 115 230
1441 10262 Suffidromes 115 230
1442 10615 Rooks 115 230
1443 10708 Cheetah 115 230
1444 373 Romulan Spelling 114 232
1445 709 Formatting Text 114 232
1446 734 The Programmer's Hex 114 232
1447 765 References 114 232
1448 10028 Demerit Points 114 232
1449 10172 The Lonesome Cargo Distributor 114 232
1450 11092 IIUC HexWorld 114 232
1451 10623 Thinking Backward 113 234
1452 11134 Fabled Rooks 113 234
1453 323 Jury Compromise 112 236
1454 648 Stamps (II) 112 236
1455 830 Shark 112 236
1456 10208 Liar or Not Liar that is the... 112 236
1457 10726 Coco Monkey 112 236
1458 11036 Eventually Periodic Sequence 112 236
1459 577 WIMP 111 239
1460 851 Maze 111 239
1461 10255 The knight's Tour 111 239
1462 10292 The Gossiping System 111 239
1463 10788 Parenthesizing Palindromes 111 239
1464 11011 Numerical Methods! A Satire 111 239
1465 698 Index 110 241
1466 882 The Mailbox Manufacturers Problem 110 241
1467 989 Su Doku 110 241
1468 10053 Envelopes 110 241
1469 10117 Nice Milk 110 241
1470 10953 Stochastic Digit Generator 110 241
1471 11159 Factors and Multiples 110 241
1472 512 Spreadsheet Tracking 109 243
1473 629 Test 109 243
1474 10381 The Rock 109 243
1475 11122 Tri Tri 109 243
1476 527 The partition of a cake 108 245
1477 903 Spiral of Numbers 108 245
1478 10280 Old Wine Into New Bottles 108 245
1479 10384 The Wall Pushers 108 245
1480 10546 The Eagle's Nest 108 245
1481 10765 Doves and bombs 108 245
1482 10782 Send More Money 108 245
1483 754 Treasure Hunt 107 248
1484 911 Multinomial Coefficients 107 248
1485 10558 A Brief Gerrymander 107 248
1486 10595 Knight on the Bee Board 106 250
1487 10906 Strange Integration 106 250
1488 10993 Ignoring Digits 106 250
1489 907 Winterim Backpacking Trip 105 252
1490 10321 Polygon Intersection 105 252
1491 10463 Aztec Knights 105 252
1492 10686 SQF Problems 105 252
1493 10772 Rose windows 105 252
1494 11157 Dynamic Frog 105 252
1495 420 Supercomputer Selection, The Sequel 104 255
1496 838 Worm World 104 255
1497 10211 Divisibility Testing! Wow! 103 257
1498 261 The Window Property 102 260
1499 600 A Duckpin Tournament 102 260
1500 10448 Unique World 102 260
1501 10818 Dora Trip 102 260
1502 11200 Sapitaur's labyrinth 102 260
1503 664 Single-Player Games 101 262
1504 10866 Magic Bitstrings 101 262
1505 11035 Card Hands 101 262
1506 609 Metal Cutting 100 265
1507 682 Whoever-pick-the-last-one-lose 100 265
1508 766 Sum of powers 100 265
1509 10353 Circles in Hexagon :-) 100 265
1510 10376 Snakes 100 265
1511 10838 The Pawn Chess 100 265
1512 10122 Mysterious Mountain 99 268
1513 10647 Optimal House Placement 99 268
1514 10985 Rings'n'Ropes 99 268
1515 11090 Going in Cycle!! 99 268
1516 199 Partial differential equations 98 270
1517 715 Substitution Cipher 98 270
1518 783 Trains 98 270
1519 10661 The Perspectographer 98 270
1520 10881 Piotr's Ants 98 270
1521 814 The Letter Carrier's Rounds 97 273
1522 11191 Square 97 273
1523 197 Cube 96 276
1524 840 Deadlock Detection 96 276
1525 988 Many Paths, One Destination 96 276
1526 10185 Phylogenetic Trees Inherited 96 276
1527 10751 Chessboard 96 276
1528 10805 Cockroach Escape Networks 96 276
1529 10835 Playing with Coins 96 276
1530 11081 Strings 96 276
1531 790 Head Judge Headache 95 279
1532 10811 Up the Ante 95 279
1533 277 Cabinets 94 282
1534 10087 The Tajmahal of ++Y2k 94 282
1535 10265 Toroidal Chess Queens' Problem 94 282
1536 10794 The Deadly Olympic Returns!!! 94 282
1537 10824 Regular Polygon 94 282
1538 10979 How Many Triangles? 94 282
1539 330 Inventory Maintenance 93 285
1540 503 Parallelepiped walk 93 285
1541 10184 Equidistance 93 285
1542 10434 Working With Specific Gravity 93 285
1543 10968 KuPellaKeS 93 285
1544 11020 Efficient Solutions 93 285
1545 11104 Cousins 93 285
1546 316 Stars 92 288
1547 870 Intersecting Rectangles 92 288
1548 10418 Hyper Toy Soldiers 92 288
1549 10755 Garbage Heap 92 288
1550 10166 Travel 91 291
1551 10839 The Curse of Barbosa 91 291
1552 10956 Prime Suspect 91 291
1553 404 Radar Scopes 90 294
1554 606 Keeps Going and Going and ... 90 294
1555 799 Safari Holiday 90 294
1556 10399 Optimus Prime 90 294
1557 10962 Don Giovanni's Last Dinner 90 294
1558 10997 Medals 90 294
1559 502 DEL command 89 298
1560 676 Horse Step Maze 89 298
1561 752 Unscrambling Images 89 298
1562 817 According to Bartjens 89 298
1563 10362 Trains 89 298
1564 10627 Infinite Race 89 298
1565 10768 Planarity 89 298
1566 11082 Matrix Decompressing 89 298
1567 11228 Transportation system. 89 298
1568 11201 The problem of the crazy linguist 88 301
1569 10743 Blocks on Blocks 87 304
1570 11186 Circum Triangle 87 304
1571 398 18-Wheeler Caravans (aka Semigroups) 86 308
1572 10597 Right Words 86 308
1573 317 Hexagon 85 312
1574 421 Polygonal Puzzle 85 312
1575 848 Fmt 85 312
1576 10607 Siege 85 312
1577 10936 Land surveyor's job 85 312
1578 11131 Close Relatives 85 312
1579 722 Lakes 84 315
1580 738 A Logical Problem 84 315
1581 910 TV game 84 315
1582 10231 Matrix World 84 315
1583 10524 Matrix Reloaded 84 315
1584 10704 Traffic! 84 315
1585 288 Arithmetic Operations With Large Integers 83 319
1586 431 Trial of the Millennium 83 319
1587 689 Napoleon's Grumble 83 319
1588 899 Colour Circles 83 319
1589 927 Integer Sequences from Addition of Terms 83 319
1590 10456 Intelligent Cats 83 319
1591 832 Financial Risk 82 323
1592 10216 The Optimal Coffee Shop!! 82 323
1593 10240 The n-Dimensional Cities 82 323
1594 226 MIDI Preprocessing 81 327
1595 857 Quantiser 81 327
1596 10030 Computer Dialogue 81 327
1597 10379 Pit Stop Strategy 81 327
1598 10614 Dreadful Vectors 81 327
1599 10983 Buy one, get the rest free 81 327
1600 11162 Independent Attacking Zones 81 327
1601 11164 Kingdom Division 81 327
1602 11174 Stand in a Line 81 327
1603 310 L--system 80 331
1604 806 Spatial Structures 80 331
1605 10618 Tango Tango Insurrection 80 331
1606 11195 Another n-Queen Problem 80 331
1607 376 More Triangles ... THE AMBIGUOUS CASE 79 335
1608 929 Number Maze 79 335
1609 10133 Audubon's Stormy Arctic Trip 79 335
1610 10270 Bigger Square Please... 79 335
1611 10437 Playing With Fraction 79 335
1612 10645 Menu 79 335
1613 11031 Looking for a Subset 79 335
1614 11182 Zeroes III 79 335
1615 928 Eternal Truths 78 340
1616 10795 A Different Task 78 340
1617 11013 Get Straight 78 340
1618 11052 Economic phone calls 78 340
1619 246 10-20-30 77 344
1620 595 A Major Problem 76 348
1621 920 Sunny Mountains 76 348
1622 10274 Fans and Gems 76 348
1623 10332 The Absent Minded Professor 76 348
1624 10431 Normal Distribution 76 348
1625 10736 Series of PI 76 348
1626 10775 Mystical Matrix 76 348
1627 10826 Hot or Cold? 76 348
1628 10841 Lift Hopping in the Real World 76 348
1629 11184 Joyful Ride 76 348
1630 10526 Intellectual Property 74 358
1631 10779 Collectors Problem 74 358
1632 11043 Fast and Easy Data Compressor 74 358
1633 11166 Power Signs 74 358
1634 10159 Star 73 363
1635 10754 Fantastic Sequence 73 363
1636 229 Scanner 72 368
1637 267 Of(f) Course! 72 368
1638 692 BUT We Need a Diagram 72 368
1639 10380 Shogi Tournament 72 368
1640 10640 Planes around the World 72 368
1641 10873 Splat, Inc. 72 368
1642 10995 Educational Journey 72 368
1643 11019 Matrix Matcher 72 368
1644 11095 Tabriz City 72 368
1645 816 Abbott's Revenge 71 373
1646 10206 Stars 71 373
1647 10521 Continuously Growing Fractions 71 373
1648 10395 Titans in Danger 70 378
1649 10470 Shifted Coefficient Number System 70 378
1650 10767 Barcelona's trams 70 378
1651 10786 Qualify for the Champions League 70 378
1652 10951 Polynomial GCD 70 378
1653 10984 Double NP-hard 70 378
1654 767 Game 69 384
1655 10729 Treequivalence 69 384
1656 10798 Be wary of Roses 69 384
1657 11084 Anagram Division 69 384
1658 11117 Little Quilt 69 384
1659 286 Dead Or Not -- That Is The Question 68 389
1660 506 System Dependencies 68 389
1661 983 Localized Summing for Blurring 68 389
1662 10876 Factory Robot 68 389
1663 10981 String Morphing 68 389
1664 11160 Going Together 68 389
1665 210 Concurrency Simulator 67 395
1666 283 Compress 67 395
1667 731 Numerical Summation of a Series 67 395
1668 10760 Translation or rotation 67 395
1669 11014 Make a Crystal 67 395
1670 11245 Anti-Arithmetic-Sequence 67 395
1671 11264 Coin Collector 67 395
1672 206 Meals on Wheels Routing System 66 401
1673 10580 Ransom Note 66 401
1674 11010 Tic-Tac-Tough 66 401
1675 11116 Babel Towers 66 401
1676 234 Switching Channels 65 407
1677 578 Polygon Puzzler 65 407
1678 881 Points, Polygons and Containers 65 407
1679 10095 Saving the Planet 65 407
1680 11091 How many Knight Placing? 65 407
1681 238 Jill's Bike 64 414
1682 742 Domino Game 64 414
1683 10204 Adventures in Moving - Part V 64 414
1684 10447 Sum-up the Primes (II) 64 414
1685 10613 Mushroom Misery 64 414
1686 10711 Stitching 64 414
1687 10837 A Research Problem 64 414
1688 10904 Structural Equivalence 64 414
1689 818 Cutting Chains 63 420
1690 10472 Fastest Vs Cheapest 63 420
1691 10682 Forró Party 63 420
1692 11224 Let's swim! 63 420
1693 11249 Game 63 420
1694 10272 DDR King 62 427
1695 10358 Matrix 62 427
1696 10501 Simplified Shisen-Sho 62 427
1697 10565 Matrix 62 427
1698 10632 Pyramid 62 427
1699 11073 Euler's Totient Function 62 427
1700 826 Symbolic Numerical System 61 434
1701 10073 Constrained Exchange Sort 61 434
1702 10403 Escape from Tut's Tomb 61 434
1703 10455 Gray Code 61 434
1704 10899 Billiard again 61 434
1705 11061 Playing War 61 434
1706 365 Welfare Reform 60 441
1707 370 Bingo 60 441
1708 631 Microzoft Calendar 60 441
1709 643 Bulk Mailing 60 441
1710 859 Chinese Checkers 60 441
1711 10458 Cricket Ranking 60 441
1712 10467 Parse Tree 60 441
1713 10513 Bangladesh Sequences 60 441
1714 10612 Paper Folding 60 441
1715 10674 Tangents 60 441
1716 10859 Placing Lampposts 60 441
1717 10886 Standard Deviation 60 441
1718 10907 Art Gallery 60 441
1719 11030 Predator II 60 441
1720 11097 Poor My Problem! :-( 60 441
1721 11238 Innoumerous bowling games 60 441
1722 10109 Solving Systems of Linear Equations 59 449
1723 10322 The Four in One Stadium 59 449
1724 10712 Count the Numbers 59 449
1725 10853 Pablito nailed a nail 59 449
1726 11118 Prisoners, Boxes and Pieces of Paper 59 449
1727 11113 Continuous Fractions 58 457
1728 11168 Airport 58 457
1729 11198 Dancing Digits 58 457
1730 667 Fence 57 465
1731 10588 Queuing at the doctors 57 465
1732 10809 Great Circle 57 465
1733 10941 Words adjustment 57 465
1734 11124 Troubles for Modern Days Problemsetters 57 465
1735 11153 Museums 57 465
1736 868 Numerical Maze 56 473
1737 874 2D Representations 56 473
1738 883 Overlapping Rectangles 56 473
1739 10631 Normals 56 473
1740 10996 Go 56 473
1741 11206 Coloring the map, but not anyhow 56 473
1742 11229 Improved tic-tac-toe. 56 473
1743 10638 The Trip II 55 482
1744 10834 The Story of Two Coins 55 482
1745 10836 The Maximum Term 55 482
1746 11260 Odd Root Sum 55 482
1747 11269 Setting Problems 55 482
1748 10052 Inviting Politicians 54 490
1749 10641 Barisal Stadium 54 490
1750 10727 Practice 54 490
1751 10867 Cutting a Polygon 54 490
1752 10869 Brownie Points II 54 490
1753 10960 The Party, Part II 54 490
1754 10965 Khepel's Problem 54 490
1755 11243 Texas Trip 54 490
1756 342 HTML Syntax Checking 53 500
1757 10411 Another Game of Tetris 53 500
1758 10481 The Gift Wrappers of Hollywood 53 500
1759 11018 Mars Buggy 53 500
1760 11178 Morley's Theorem 53 500
1761 11256 Repetitive Multiple 53 500
1762 564 Gaston 52 509
1763 831 Document Validator 52 509
1764 11071 Permutation Representation 52 509
1765 11123 Counting Trapizoid 52 509
1766 957 Popes 51 519
1767 10885 Martin the Gardener 51 519
1768 10961 Chasing After Don Giovanni 51 519
1769 11261 Bishops 51 519
1770 733 Follow the Folding Dot 50 530
1771 908 Re-connecting Computer Sites 50 530
1772 986 How Many? 50 530
1773 10438 Meta Editor 50 530
1774 11120 Very Funny Mr. Feynman 50 530
1775 10335 Ray Inside a Polygon 49 541
1776 10847 Basic Tautologies 49 541
1777 11016 Square Counting 49 541
1778 11259 Coin Changing Again 49 541
1779 918 ASCII Mandelbrot 48 552
1780 972 Horizon Line 48 552
1781 10224 Return of the Jedi 48 552
1782 10498 Happiness 48 552
1783 11109 Rinse 48 552
1784 11262 Weird Fence 48 552
1785 10766 Organising the Organisation 47 564
1786 10939 Ants, Aphids and a Ladybug 47 564
1787 11165 Galactic Travel 47 564
1788 827 Buddy Memory Allocator 46 576
1789 853 DVD Subtitles 46 576
1790 873 Loan (II) 46 576
1791 960 Gaussian Primes 46 576
1792 10864 The Predator 46 576
1793 11190 Series of Powers 46 576
1794 473 Raucous Rockers 45 589
1795 678 Schedule of Taiwan Baseball League 45 589
1796 898 Hole Cutter 45 589
1797 10266 Surveying 45 589
1798 10289 A Square and Equilateral Triangles 45 589
1799 10797 Peaceful Sharing 45 589
1800 367 Halting Factor Replacement Systems 44 602
1801 611 Parallel Deadlock 44 602
1802 802 Lead or Gold 44 602
1803 10064 Travelling in another Dimension 44 602
1804 10531 Maze Statistics 44 602
1805 11107 Life Forms 44 602
1806 11128 Faulty Computer 44 602
1807 11144 S.O.S. 44 602
1808 581 Word Search Wonder 43 616
1809 842 Crossword Puzzles 43 616
1810 944 Happy Numbers 43 616
1811 10828 Back to Kernighan-Ritchie 43 616
1812 10884 Persephone 43 616
1813 11006 Wheel Good 43 616
1814 11176 Winning Streak 43 616
1815 214 Code Generation 42 631
1816 879 Circuit Nets 42 631
1817 985 Round and Round Maze 42 631
1818 10121 Legendary Pokemon 42 631
1819 10241 Semi-triangular and also Square 42 631
1820 10402 Triangle Covering 42 631
1821 10584 Text Formalization 42 631
1822 11066 Aragorn 42 631
1823 282 Rename 41 646
1824 764 Pentominos 41 646
1825 841 Snake 41 646
1826 10478 The Falling Pillars 41 646
1827 10695 Find the Point 41 646
1828 10752 Distant Jumping 41 646
1829 11017 A Greener World 41 646
1830 11175 From D to E and Back 41 646
1831 11253 Fractal 41 646
1832 10429 Mohr's Circle 40 662
1833 10749 Automobile Travelling 40 662
1834 11126 Relaxed Golf 40 662
1835 11167 Monkeys in the Emei Mountain 40 662
1836 265 Dining Diplomats 39 679
1837 546 Image Recognizer 39 679
1838 976 Bridge Building 39 679
1839 10796 Right Hand Rule 39 679
1840 11156 Continuous Drawing 39 679
1841 237 Monitoring Wheelchair Patients 38 697
1842 683 Character Decoding 38 697
1843 744 Triangular Museum 38 697
1844 822 Queue and A 38 697
1845 946 A Pile of Boxes 38 697
1846 947 Master Mind Helper 38 697
1847 11033 Help my Brother 38 697
1848 269 Counting Patterns 37 716
1849 569 Horse Shoe Scoring 37 716
1850 747 Grid Soccer 37 716
1851 804 Petri Net Simulation 37 716
1852 877 Offset Polygons 37 716
1853 990 Diving for Gold 37 716
1854 997 Show the Sequence 37 716
1855 10676 Grid Points 37 716
1856 10893 Creating Sudoku Puzzles 37 716
1857 10967 The Great Escape 37 716
1858 11065 A Gentlemen's Agreement 37 716
1859 11187 Water Crisis 37 716
1860 243 Theseus and the Minotaur (II) 36 736
1861 284 Logic 36 736
1862 655 Scrabble 36 736
1863 878 Rotating Tetris Pieces 36 736
1864 995 Super Divisible Numbers 36 736
1865 10031 Saskatchewan 36 736
1866 11255 Necklace 36 736
1867 262 Transferable Voting 35 757
1868 10671 Grid Speed 35 757
1869 10758 Journey 35 757
1870 10808 Rational Resistors 35 757
1871 10833 Lunar Forest 35 757
1872 10949 Kids in a Grid 35 757
1873 11183 Teen Girl Squad 35 757
1874 809 Bullet Hole 34 779
1875 819 Gifts Large and Small 34 779
1876 10103 Karpovich blocks 34 779
1877 10108 The Mosquito Killer Mosquitos 34 779
1878 10119 Farewell, my friend 34 779
1879 10975 Dueue's Quiz 34 779
1880 11025 Mr. And Mrs. Hamilton 34 779
1881 11210 Chinese Mahjong 34 779
1882 285 Crosswords 33 803
1883 289 A Very Nasty Text Formatter 33 803
1884 925 No more prerequisites, please! 33 803
1885 10135 Herding Frosh 33 803
1886 10414 Denki Blocks 33 803
1887 11212 Editing a Book 33 803
1888 475 Wild Thing 32 828
1889 549 Evaluating an Equations Board 32 828
1890 728 Scatter Point Plot 32 828
1891 906 Rational Neighbor 32 828
1892 10538 Powerful Magic Squares 32 828
1893 11250 Working with Small Numbers 32 828
1894 266 Stamping Out Stamps 31 854
1895 769 Magic of David Copperfield 31 854
1896 823 Stopper Stumper 31 854
1897 10770 Sokoban 31 854
1898 11007 Mini Cube 31 854
1899 11266 Equations 31 854
1900 329 PostScript Emulation 30 883
1901 904 Overlapping Air Traffic Control Zones 30 883
1902 10675 Revenge of Faucet Flow 30 883
1903 11114 Polygon Encoder 30 883
1904 359 Sex Assignments And Breeding Experiments 29 913
1905 915 Stack of Cylinders 29 913
1906 978 Lemmings Battle! 29 913
1907 10605 Mines For Diamonds 29 913
1908 10737 The Difference Engine 29 913
1909 11102 Moonshine 29 913
1910 11214 Guarding the Chessboard 29 913
1911 11252 Take Me Home (To the Place I Belong) 29 913
1912 11268 Reliable Network 29 913
1913 225 Golygons 28 946
1914 293 Bits 28 946
1915 650 Bowl 28 946
1916 890 Maze (II) 28 946
1917 10628 Quadrills 28 946
1918 10691 Subway 28 946
1919 10972 RevolC FaeLoN 28 946
1920 11037 Point of View in Flatland 28 946
1921 251 Nondeterministic Trellis Automata 27 981
1922 396 Top Dog 27 981
1923 10572 Black & White 27 981
1924 10863 Shovelling Snow 27 981
1925 11050 Construct the wall maze 27 981
1926 205 Getting There 26 1019
1927 244 Train Time 26 1019
1928 504 Random number 26 1019
1929 891 Syntrax 26 1019
1930 10153 New Horizons 26 1019
1931 10829 L-Gap Substrings 26 1019
1932 11171 SMS 26 1019
1933 11177 Fighting Against a Polygonal Monster 26 1019
1934 11267 The Hire-a-Coder Business Model 26 1019
1935 295 Fatman 25 1059
1936 979 The Abominable Triangleman 25 1059
1937 11046 Numbers and operations 25 1059
1938 687 Lattice Practices 24 1104
1939 10485 Painting with CSE 24 1104
1940 11169 Deal or No Deal 24 1104
1941 11179 Bit Stream 24 1104
1942 11196 Birthday Cake 24 1104
1943 746 Polygon Visibility 23 1152
1944 982 Cube 23 1152
1945 10435 Compare Directories 23 1152
1946 10969 Sweet Dream 23 1152
1947 11009 Geometry Once Again 23 1152
1948 11215 How Many Numbers? 23 1152
1949 730 Morse Code Generation 22 1204
1950 970 Particles 22 1204
1951 10756 HardNumbers 22 1204
1952 11209 Be Together Again and Forever 22 1204
1953 11257 New Marketing Plan 22 1204
1954 777 Codebreakers 21 1261
1955 813 Robot 21 1261
1956 912 Live From Mars 21 1261
1957 10988 From G to H and back 21 1261
1958 11146 Insurrection 21 1261
1959 212 Use of Hospital Facilities 20 1324
1960 666 Rating 20 1324
1961 10151 Spaghetti 20 1324
1962 10155 Green Eggs and Ham 20 1324
1963 11075 Collage 20 1324
1964 203 Running Lights Visibility Calculator 19 1394
1965 801 Flight Planning 19 1394
1966 905 Tacos Panchita 19 1394
1967 953 The Incredible Pile Machine 19 1394
1968 980 X-Express 19 1394
1969 11098 Battle II 19 1394
1970 11189 A Simple Pendulum 19 1394
1971 11194 Stone Grid 19 1394
1972 322 Ships 18 1471
1973 797 Two Way Traffic 18 1471
1974 807 Towers of Powers 18 1471
1975 854 Worse Code 18 1471
1976 10143 Loan 18 1471
1977 10314 Three Pigs 18 1471
1978 10753 Exponential Function 18 1471
1979 11135 Gopher that walks and swims 18 1471
1980 11251 Fractions 18 1471
1981 204 Robot Crash 17 1558
1982 249 Bang the Drum Slowly 17 1558
1983 304 Department 17 1558
1984 794 Straightest Paths 17 1558
1985 798 Tile Puzzle 17 1558
1986 829 Almost Balanced Trees 17 1558
1987 862 Origami 17 1558
1988 11023 Multisets and Sequences 17 1558
1989 11119 Chemical Attraction 17 1558
1990 11193 Infinix 17 1558
1991 207 PGA Tour Prize Money 16 1655
1992 605 The Rotating Disk 16 1655
1993 646 The Gourmet Club 16 1655
1994 723 Comment Removal 16 1655
1995 886 Named Extension Dialing 16 1655
1996 887 Revolutionary Calendar 16 1655
1997 889 Islands 16 1655
1998 10096 The Richest Man of the Universe 16 1655
1999 10762 Treasure Castle 16 1655
2000 10846 Reading time from a clock 16 1655
2001 10952 Pattern Transformations 16 1655
2002 11041 Quarter-Finals with Brazil!? No!!! 16 1655
2003 11079 What's the Time? 16 1655
2004 11142 MineSweeper II 16 1655
2005 11163 Jaguar King 16 1655
2006 223 Classifying Lots in a Subdivision 15 1766
2007 292 Presentation Error 15 1766
2008 864 Scheme Pretty-Printing 15 1766
2009 909 The BitPack Data Compression Problem 15 1766
2010 921 A Word Puzzle in the Sunny Mountains 15 1766
2011 922 Rectangle by the Ocean 15 1766
2012 10046 Fold-up Patterns 15 1766
2013 10636 Stretching Geometry 15 1766
2014 11141 Sugar Cubes 15 1766
2015 233 Package Pricing 14 1892
2016 720 Hares and Foxes 14 1892
2017 11139 Counting Quadrilaterals 14 1892
2018 996 Find the Sequence 13 2037
2019 10629 Truckin' 13 2037
2020 11197 Counting RNA sequences 13 2037
2021 11265 The Sultan's Problem 13 2037
2022 235 Typesetting 12 2207
2023 281 Rubik's Cube 12 2207
2024 690 Pipeline Scheduling 12 2207
2025 691 Triangle Partition 12 2207
2026 885 Telephone Directory Alphabetization 12 2207
2027 888 Donkey 12 2207
2028 949 Getaway 12 2207
2029 952 Uno game 12 2207
2030 954 Tetravex solver 12 2207
2031 959 Car Rallying 12 2207
2032 981 Systematic Cyclic Redundancy Check Codes 12 2207
2033 987 Maternity 12 2207
2034 10639 Square Puzzle 12 2207
2035 248 Cutting Corners 11 2408
2036 749 Machine Repair Simulation 11 2408
2037 849 Radar Tracking 11 2408
2038 955 Interpreting Old Maps 11 2408
2039 992 Customer Service Cost Evaluation 11 2408
2040 10492 Optimal Mastermind Strategy 11 2408
2041 10861 Security by Ambiguity 11 2408
2042 217 Radio Direction Finder 10 2649
2043 279 Spin 10 2649
2044 525 Milk Bottle Data 10 2649
2045 950 Tweedle Numbers 10 2649
2046 956 The Minimum Slot Machine 10 2649
2047 241 Sail Race 9 2943
2048 354 Crazy Calculator 9 2943
2049 786 Working with Relations 9 2943
2050 923 One Against Many 9 2943
2051 975 Gutenberg Clumsy Helper 9 2943
2052 10857 Easter Eggs 9 2943
2053 463 Polynomial Factorization 8 3311
2054 917 Euro 2004 8 3311
2055 919 Cutting Polyominoes 8 3311
2056 958 A Homer's Holiday 8 3311
2057 984 Finding Haplotypes 8 3311
2058 10383 Queen vs Rook 8 3311
2059 10955 Playfair Cipher 8 3311
2060 894 Juggling Trams 7 3784
2061 964 Custom Language 7 3784
2062 973 The Guessing Game 7 3784
2063 10778 Mathemagicland 7 3784
2064 10840 Multi-stage Compressor 6 4414
2065 11145 AvreniM 6 4414
2066 11154 An Octal World 6 4414
2067 11199 Equations in Disguise 6 4414
2068 219 Department of Redundancy Department 5 5297
2069 951 The Pieces of the Puzzle 5 5297
2070 10630 Millennium Ceremony 5 5297
2071 11143 Subtitles 5 5297
2072 693 Digital Racing Circuit 4 6621
2073 977 Old West Rumours 4 6621
2074 10657 Prince Frog II 4 6621
2075 10974 The Ridiculous Game 4 6621
2076 11211 Digital Logic 4 6621
2077 10971 Building Construction 3 8828
2078 11213 Flipull 3 8828
2079 11248 Frequency Hopping 3 8828
2080 961 Ambiguous or Incomplete Inductive Definitions 2 13243
2081 10059 The Hazard of CSE Department! 2 13243
2082 10757 Interpreting SQL 2 13243
2083 10966 3KP-BASH Project 2 13243
2084 236 VTAS - Vessel Traffic Advisory Service 1 26485
2085 863 Process Scheduling 1 26485
2086 896 Board Game 1 26485
2087 10781 Global Positioning System 1 26485
2088 10845 The crusades 1 26485
2089 11263 Nested Rectangles 1 26485
2090 224 Kissin' Cousins 0 Impossible
2091 228 Resource Allocation 0 Impossible
2092 252 Trucking 0 Impossible
2093 287 Text Comparsion 0 Impossible
2094 351 ``Cheapest'' Scores 0 Impossible
2095 360 Don't Get Hives From This One! 0 Impossible
2096 363 Approximate Matches 0 Impossible
2097 364 Constitutional Computing 0 Impossible
2098 368 Indexing Web Pages 0 Impossible
2099 372 WhatFix Notation 0 Impossible
2100 456 Robotic Stacker 0 Impossible
2101 461 The Reservation Maker 0 Impossible
2102 470 Nasty Virus 0 Impossible
2103 472 Simultaneous Equations 0 Impossible
2104 479 Irrigation Flow Rates 0 Impossible
2105 480 Tempus Fugit 0 Impossible
2106 508 Morse Mismatches 0 Impossible
2107 509 RAID! 0 Impossible
2108 510 Optimal Routing 0 Impossible
2109 511 Do You Know the Way to San Jose? 0 Impossible
2110 513 Window Frames 0 Impossible
2111 522 Schedule Problem 0 Impossible
2112 528 The Problem of Train Setout 0 Impossible
2113 582 Randomly Wired Neural Nets 0 Impossible
2114 596 The Incredible Hull 0 Impossible
2115 597 Last Name First, Please 0 Impossible
2116 649 You Who? 0 Impossible
2117 675 Convex Hull of the Polygon 0 Impossible
2118 717 Calculating Expressions on Turing Machine 0 Impossible
2119 724 Reverse 0 Impossible
2120 761 Transform those strings 0 Impossible
2121 768 Crossword 0 Impossible
2122 770 Puncher 0 Impossible
2123 771 Flying Stars 0 Impossible
2124 772 Divide et unita 0 Impossible
2125 773 The JustaPox Language 0 Impossible
2126 774 Driving in City Squares 0 Impossible
2127 778 Recording a tape 0 Impossible
2128 779 Wily Hacker's Problem 0 Impossible
2129 780 Sentence Generator 0 Impossible
2130 781 Optimisation 0 Impossible
2131 788 One Day Tours 0 Impossible
2132 789 Indexing 0 Impossible
2133 791 Term Reductions 0 Impossible
2134 792 Program Modules 0 Impossible
2135 800 Crystal Clear 0 Impossible
2136 803 Page Selection by Keyword Matching 0 Impossible
2137 805 Polygon Intersections 0 Impossible
2138 867 Storing Images in a Sequence 0 Impossible
2139 875 Monopoly 0 Impossible
2140 876 Balanced Expressions 0 Impossible
2141 901 From Databases to XML 0 Impossible
2142 916 Dividing Land 0 Impossible
2143 930 Polynomial Roots 0 Impossible
2144 931 The Probable n-Ascendants 0 Impossible
2145 932 Checking the N-Queens Problem 0 Impossible
2146 933 Water Flow 0 Impossible
2147 934 Overlapping Areas 0 Impossible
2148 935 Smart Strategy 0 Impossible
2149 936 Mars for Sale 0 Impossible
2150 937 Kriss Kross Puzzle 0 Impossible
2151 938 Gilix 0 Impossible
2152 939 Genes 0 Impossible
2153 940 Autobiographical Numbers 0 Impossible
2154 941 Permutations 0 Impossible
2155 942 Cyclic Numbers 0 Impossible
2156 943 Number Format Translator 0 Impossible
2157 945 Loading a Cargo Ship 0 Impossible
2158 963 Spelling Corrector 0 Impossible
2159 965 Police Road Blocks 0 Impossible
2160 966 Lost Inheritances 0 Impossible
2161 968 Constellations 0 Impossible
2162 969 AlienAlgebra 0 Impossible
2163 971 Towers 0 Impossible
2164 994 POP 0 Impossible
2165 998 Dendogram 0 Impossible
2166 999 Book signatures 0 Impossible
2167 11188 A Strange Opera House 0 Impossible
2168 11208 Airplane Scheduling 0 Impossible
2169 11216 Irrigation 0 Impossible
2170 11217 Jewel Magnetizer 0 Impossible
↑TOP
http://www.cnblogs.com/devymex/archive/2010/08/26/1808716.html
![leetcode_17.Letter Combinations of a Phone Number[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)