ZZUOJ - 1195 - OS Job Scheduling

郑州大学第七届ACM大学生程序设计竞赛

OJ Job Scheduling

Description

OS(Operating System) is to help user solve the problem, such as run job(task).A multitasking OS is one that can simultaneously interleave execution of more than one job .It means that, at the same time, more than one job waiting for being processed by the OS. But now that the OS is only one processor, a processor can only execute one job at the same time. So the OS will be decided at a time which one job be processed. Each job has three property: time(the time submit to the system), priority (Perform high priority) and length(the running time of job). In order to improve the throughput(the number of unit time processing jobs) about OS, there are several basic algorithms to solve this problem. They were explained in the following:

FCFS: first come first service

The jobs are executed on first come, first serve basis. It is easy to understand and implement, but it is poor in performance as average wait time is high.

SJF: Shortest job first.

It is the best approach to minimize waiting time, but impossible to implement. The processor should know in advance how much time process will take.

PBS: Priority based scheduling

Each process is assigned a priority. Process with highest priority is to be executed first and so on. Processes with same priority are executed on first come first serve basis.

Today, Chris’s teacher gave him a homework: given n jobs and the time of each job submission to the system, use the method of FCFS(The first submit is executed first),to decide the order of the operation is performed.

Chris get confused with this problem thoroughly, so he ask you for help. Please help him to solve this problem.

Input

There are multiple input data groups, for each input data group:

The first line of input an integer n (1≤n≤1000),the number of the job should to be handled. The next line contains n space-separated integer numbers. The i-th number ti (1≤i≤1000, 1≤ti≤1000)denotes the time of i-th job be submitted. It is essential that ti≠tj(1≤i , j≤1000 && i≠j )

Output

For each input data group, print n space-separated integer numbers, the i-th number represents the i-th run jobs.

Sample Input

5

1 2 3 4 5

5

5 4 3 2 1

5

3 2 4 1 5

Sample Output

1 2 3 4 5

5 4 3 2 1

4 2 1 3 5

第七届校赛时我大一，当时的我真是水水的（现在依旧水水的），没给A出来，回过头来看挺简单的，当时为啥就是不会呢

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;

struct node{
    int job_i;
    int job_time;
}job[];

bool cmp(node a, node b){
    return a.job_time < b.job_time;     //根据time降序对结构体排序
}

int main() {
    int n;
    while(scanf("%d", &n)!=EOF){
        for(int i = ; i < n; i++){
            scanf("%d", &job[i].job_time);
            job[i].job_i = i+;
        }

        sort(job, job+n, cmp);

        for(int i = ; i < n; i++){
            if(i)   printf(" ");          //注意输出格式
            printf("%d", job[i].job_i);   //注意输出的是原始的序号
        }
        printf("\n");
    }
    return ;
}