Submission #890885

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int n;
int a[100010];

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

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:8:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d", &n);
                ^
./Main.cpp:9:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 for(int i = 1; i <= n; i++) scanf("%d", a + i);
                                               ^

Judge Result