Submission #891285

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Source Code Expand

#include <cstdio>
using namespace std;

const int MAXN = 100005;

int N;
int a[MAXN];

int main() {
	scanf("%d", &N);
	for (int i = 1; i <= N; i++)
		scanf("%d", a + i);
	
	int sol = 0;
	for (int i = 1; i <= N; i++)
		sol += a[a[i]] == i;
	
	printf("%d\n", sol / 2);
	
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
./Main.cpp:12:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", a + i);
                     ^

Judge Result