Submission #891255

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Source Code Expand

/* ***********************************************
Author        :axp
Created Time  :2016/9/24 20:07:59
TASK		  :B.cpp
LANG          :C++
************************************************ */

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <cmath>
#include <cstdlib>
#include <ctime>
using namespace std;

typedef long long ll;
const int inf = 1<<30;
const int md = 1e9+7;
const int N = 1e5+10;
int n,m;
int T;
int ar[N];

int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    cin>>n;
	int ans=0;
	for(int i=1;i<=n;i++)
	{
		int x;
		cin>>x;
		ar[i]=x;
		if(ar[x]==i)
			ans++;
	}
	cout<<ans<<endl;
    return 0;
}

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