Submission #890807

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Source Code Expand

#include <cstdio>
using namespace std;

const int N = 100500;
int to[N];

int main() {
    int n;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        int a;
        scanf("%d", &a);
        --a;
        to[i] = a;
    }
    int ans = 0;
    for (int i = 0; i < n; i++) {
        int j = to[i];
        if (to[j] == i && j < i)
            ans++;
    }
    printf("%d\n", ans);
}

Submission Info

Judge Result