Submission #1698193

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Source Code Expand

#include <iostream>
using namespace std;
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; ++i){
    cin >> a[i];
  }
  int count = 0;
  int b;
  for (int i = 0; i < n; ++i){
    b = a[i]-1;
    if(a[b]-1 == i) count++;
  }
  cout << count/2 << endl;
}

Submission Info

Judge Result