Submission #1609358

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Source Code Expand

#include<iostream>
using namespace std;
int main(void) {
  int N;
  cin>>N;
  int count;
  int a[N];
  for(int i=0;i<N;i++){
    cin>>a[i];
  }
  for(int i=0;i<N;i++){
    if(a[a[i]]==i){
      count+=1;
    }
  }
  cout<<count<<endl;
  return 0;
}

Submission Info

Judge Result