Submission #890788

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

int a[1234567];

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%d", a + i);
    a[i]--;
  }
  int ans = 0;
  for (int i = 0; i < n; i++) {
    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:9:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
                  ^
./Main.cpp:11:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", a + i);
                       ^

Judge Result