#include<iostream> using namespace std; #define max 100001 int main() { int n,data1[max],data2[max],i,flag; while(scanf("%d",&n)!=EOF) { if(n==0) break; for(i=1;i<=n;i++) { scanf("%d",&data1[i]); data2[data1[i]]=i; } flag=0; for(i=1;i<=n;i++) { if(data1[i]!=data2[i]) { flag=1; break; } } if(flag) printf("not ambiguous\n"); else printf("ambiguous\n"); } return 0; }

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