A
https://atcoder.jp/contests/abc177/tasks/abc177_c?lang=en
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B
https://atcoder.jp/contests/abc177/tasks/abc177_d?lang=en
C
https://atcoder.jp/contests/abc183/tasks/abc183_c?lang=en
D
https://atcoder.jp/contests/abc183/tasks/abc183_d?lang=en
E
https://atcoder.jp/contests/abc182/tasks/abc182_c?lang=en
F
https://atcoder.jp/contests/abc182/tasks/abc182_d?lang=en
G
https://atcoder.jp/contests/abc180/tasks/abc180_c?lang=en
H
https://atcoder.jp/contests/abc170/tasks/abc170_d?lang=en