Submission #890918

---

Source Code Expand

#include <stdio.h>
int n;
int a[100000];
int main() {
  int i;
  scanf("%d", &n);
  for(i = 0; i < n; i++) {
    scanf("%d", a+i);
    a[i]--;
  }
  int res = 0;
  for(i = 0; i < n; i++) {
    if(a[a[i]] == i) res++;
  }
  printf("%d\n", res / 2);
  return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:6:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ^
./Main.c:8:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", a+i);
     ^

Judge Result