Submission #1401260

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Source Code Expand

#include<cstdio>
int a[100005];
int main(){
  int n;scanf("%d",&n);
  for(int i=1;i<=n;++i)scanf("%d",a+i);
  int ans=0;
  for(int i=1;i<=n;++i)ans+=(a[a[i]]==i);
  printf("%d\n",ans/2);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:4:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int n;scanf("%d",&n);
                       ^
./Main.cpp:5:39: 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