Submission #890981

---

Source Code Expand

#include <cstdio>

using namespace std;

int n;
int a[111111];

int main(void) {
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d", a+i);

  int res = 0;
  for (int i = 0; i < n; i++) {
    if (i == a[a[i]-1]-1) res += 1;
  }
  printf("%d\n", res/2);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:9:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
                  ^
./Main.cpp:10:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   for (int i = 0; i < n; i++) scanf("%d", a+i);
                                               ^

Judge Result