Submission #890714

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define fo(i,a,b) for (int i = (a); i < (b); i++)
#define pb push_back
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
#define N 1234567

int n, a[N];
int main() {
	scanf("%d", &n);
	fo(i,0,n) scanf("%d", a+i), a[i]--;
	int ans = 0;
	fo(i,0,n) if (a[a[i]] == i) ans++;
	printf("%d\n", ans/2);

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:13:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  fo(i,0,n) scanf("%d", a+i), a[i]--;
                                    ^

Judge Result