Submission #891776

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    scanf("%d", &n);
    vector<int> a(n);

    for (int i = 0; i < n; i++)
    {
        scanf("%d", &a[i]);
        a[i]--;
    }

    int p = 0;
    for (int i = 0; i < n; i++)
        if (a[a[i]] == i)
            p++;

    printf("%d\n", p / 2);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:8:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:13:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
                           ^

Judge Result