Submission #1572380

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Source Code Expand

#include<iostream>
using namespace std;

int main(){
int N,a[100001];
cin>>N;
for(int i=1;i<N+1;i++){
  cin>>a[i];
}

int count,b;
for(int i=1;i<N+1;i++){
   b=a[i];
   if(i==a[b]){count++;}
}
cout<<count/2;



return 0;
}

Submission Info

Judge Result