Submission #1674417

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Source Code Expand

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main(void){
    int n=0,m=0;
    int a[100000];
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    for(int  i=0;i<n;i++){
        if(i+1==a[a[i]-1]) m+=1;
    }
cout<<m/2<<endl;
return 0;
}

Submission Info

Judge Result