poj 2470 Ambiguous permutations

#include<iostream>#include<stdio.h>using namespace std;int a[100001];int main(){int i;int n;while(scanf("%d",&n)!=EOF&&n){for(i=1;i<=n;i++)scanf("%d",&a[i]);for(i=1;i<=n;i++){if(a[a[i]]!=i){printf("not ambiguousn");break;}}if(i>n)printf("ambiguousn");}return 0;}