Submission #890839


Source Code Expand

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define fbo find_by_order
#define ook order_of_key

typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<int> vi;
typedef long double ld; 
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;
typedef set<int>::iterator sit;
typedef map<int,int>::iterator mit;
typedef vector<int>::iterator vit;

int a[100001];

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n; cin >> n;
	for(int i = 0; i < n; i++)
	{
		cin >> a[i]; a[i]--;
	}
	ll ans = 0;
	for(int i = 0; i < n; i++)
	{
		if(a[a[i]] == i) ans++;
	}
	ans>>=1;
	cout<<ans<<'\n';
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User zscoder
Language C++14 (GCC 5.4.1)
Score 200
Code Size 867 Byte
Status AC
Exec Time 11 ms
Memory 640 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 200 / 200
Status
AC × 3
AC × 15
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt
Case Name Status Exec Time Memory
0_00.txt AC 3 ms 256 KB
0_01.txt AC 3 ms 256 KB
0_02.txt AC 2 ms 256 KB
1_00.txt AC 2 ms 256 KB
1_01.txt AC 11 ms 640 KB
1_02.txt AC 11 ms 640 KB
1_03.txt AC 11 ms 640 KB
1_04.txt AC 11 ms 640 KB
1_05.txt AC 11 ms 640 KB
1_06.txt AC 11 ms 640 KB
1_07.txt AC 11 ms 640 KB
1_08.txt AC 6 ms 384 KB
1_09.txt AC 9 ms 640 KB
1_10.txt AC 8 ms 512 KB
1_11.txt AC 4 ms 384 KB