一个关于密码的问题，地址：http://acm.pku.edu.cn/JudgeOnline/problem?id=1026
#include "stdio.h"
int num[205];
int len[205];
int chang[205][205];
char temp[205];
int main()
{
    int n,k;
    int addr,i,j,t;
    char ch;
    while(1)
    {
        scanf("%d",&n);
        if(n==0)break;
        for(i=0;i<n;i++){scanf("%d",&num[i]);len[i]=1;}
        for(i=0;i<n;i++)
        {
            chang[i][0]=i;
            for(j=1;j<n;j++)
            {
                t=chang[i][j-1];
                if(num[t]-1==i)break;
                chang[i][j]=num[t]-1;
                len[i]++;
            }
        }
        while(1)
        {
            scanf("%d",&k);
            if(k==0){printf("\n");break;}
            addr=0;
            ch=getchar();
            for(i=0;i<n;i++)temp[i]=' ';
            while((ch=getchar())!='\n')temp[chang[addr++][k%len[addr]]]=ch;
            for(i=0;i<n;i++)printf("%c",temp[i]);
            printf("\n");
        }
    }
    return 0;
}