Submission #1702706

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Source Code Expand

#include <iostream>
using namespace std;
 
int a[100002];
int b[100002];
int n;
 
int main() {
	cin >> n;
	for(int i = 1; i <= n; i++)
		b[i] = 0;
	for(int i = 1; i <= n; i++)
		scanf("%d", &a[i]);
 
	int cnt = 0;
	for(int i = 1; i <= n; i++) {
		if(b[i] == 1) continue;
		if(a[a[i]] == i) {
			cnt++;
			b[a[i]] = 1;
		}
	}
 
	printf("%d", cnt);
 
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:13:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
                     ^

Judge Result