Submission #1500127

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Source Code Expand

#include<iostream>
#include<cstdio>
#include<string>
#include<algorithm>
#define REP(i,n) for(int i=0;i<(n);i++)
using namespace std;
int main(){
	int n,a[100000],ans=0;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(i+1==a[j] && i!=j && j+1==a[i]){
				ans++;
			}
		}
	}
	cout<<ans/2<<std::endl;
	return 0;
}

Submission Info

Judge Result