Submission #2714761

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
                                                                                   

int main(){
                                                                     

    int n, i;

    int k = 0;

    
    cin >> n;

    vector<int> a(n + 1);


    for( i = 1 ; i <= n ; i = i + 1 ){

         cin >> a.at(i);

         }


    for( i = 1 ; i <= n ; i = i + 1 ){

         if( a.at( a.at(i) ) == i ) k += 1;

         }


    cout << k / 2 << endl;


    return 0;

    }

Submission Info

Judge Result