Submission #6876789

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Source Code Expand

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
	int num, i, ans = 0;
	cin >> num;
	vector<int> d(num + 1);
	for (i = 1; i <= num; i++)
		scanf("%d", &d[i]);
	for (i = 1; i <= num; i++) {
		if (d[d[i]] == i)
			ans++;
	}
	ans >>= 1;
	cout << ans << "\n";
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:11:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &d[i]);
                     ^

Judge Result