Submission #1218062

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Source Code Expand

#include <iostream>
using namespace std;

int a[100010] = {};

int main(void){
    // Here your code !
    int n,result = 0;
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> a[i];
    
    for(int i = 1; i <= n; i++){
        if(i == a[a[i]]){
            result++;
        }
    }
    
    cout << result / 2 << endl;
    
}

Submission Info

Judge Result