Submission #890889

---

Source Code Expand

//If your experiment needs statistics, 
//you ought to have done a better experiment.
#include<bits/stdc++.h>
using namespace std;
typedef long long int uli;
const int mx=1e5+10;
int a[mx];
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++){
    int j=a[i];
    if(a[j]==i)ans++;
  }
  assert(ans%2==0);
  printf("%d\n",ans/2);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:10:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
                 ^
./Main.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",a+i);
                    ^

Judge Result