Submission #890903

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Source Code Expand

#include <stdio.h>
#include <string.h>
#include <algorithm>

int arr[100010];

int main()
{
	int n, r = 0, i;
	scanf("%d", &n);
	for(i = 1; i<=n; i++)
		scanf("%d", &arr[i]);
	for(i = 1; i<=n; i++)
	{
		if(arr[arr[i]]==i)
			r++;
	}
	printf("%d", r);
	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:12:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &arr[i]);
                       ^

Judge Result