Submission #1590375

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Source Code Expand

#include <iostream>
#include <vector>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> a(N+1);
    a[0] = 0;
    for(int i=1; i<=N; i++) cin >> a[i];

    int cnt = 0;
    for(int i=1; i<=N-1; i++) {
        int like = a[i];
        if(like > i && a[like] == i) cnt++;
    }
    cout << cnt;
}

Submission Info

Judge Result