zoj 1538 Cipher

#include<cstdio>using namespace std;enum {    SIZ = 61200,};int tree[SIZ];int N, start;void readIn(){    for(int i=0;i<N;i++){        scanf("%d ", &tree[i]);    }}int fun(){    start = 0;    for(int i=0;i<N;i++){        start += tree[start];        start %= N;    }    return tree[start];}int main(){    while( scanf("%d ", &N) > 0){        readIn();        printf("%dn", fun());    }return 0;}