Submission #891789

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Source Code Expand

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <iomanip>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;

int list[100020];
bool check[100020];
int a[100020];
int N;
int ans;

int main(void){

	scanf("%d",&N);

	for (int i = 1; i <= N; ++i)
	{
		scanf("%d",a+i);
	}

	for (int i = 1; i <= N; ++i)
	{
		list[i]=a[i];
	}

	for (int i = 1; i <= N; ++i)
	{
		if(i==list[a[i]]&&!check[i]){
			ans++;
			check[a[i]]=true;
		}
	}

	printf("%d\n", ans);

	return 0;

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&N);
                ^
./Main.cpp:24:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",a+i);
                  ^

Judge Result