Submission #890755


Source Code Expand

#include <bits/stdc++.h>
using namespace std;


map< pair<int,int> , int> memo;

void solve(long long N, vector<long long> A){
	for(int i = 0 ; i < N ; i++){	
		A[i]--;
		int a = A[i];
		int b = i;
		if( a < b ) swap(a,b);
		memo[{a,b}]++;
	}
	int ans = 0;
	for( auto p : memo ){
		if( p.second == 2 ) ans++;
	}	
	cout << ans << endl;
}



int main(){	
	ios::sync_with_stdio(false);
	long long N;
	cin >> N;
	vector<long long> a(N-1+1);
	for(int i = 0 ; i <= N-1 ; i++){
		cin >> a[i];
	}
	solve(N, a);
	return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User kyuridenamida
Language C++14 (GCC 5.4.1)
Score 200
Code Size 550 Byte
Status AC
Exec Time 40 ms
Memory 8064 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 2 ms 256 KB
0_01.txt AC 2 ms 256 KB
0_02.txt AC 2 ms 256 KB
1_00.txt AC 2 ms 256 KB
1_01.txt AC 32 ms 4992 KB
1_02.txt AC 40 ms 8064 KB
1_03.txt AC 39 ms 7680 KB
1_04.txt AC 40 ms 8064 KB
1_05.txt AC 40 ms 8064 KB
1_06.txt AC 40 ms 8064 KB
1_07.txt AC 40 ms 8064 KB
1_08.txt AC 16 ms 3200 KB
1_09.txt AC 33 ms 6656 KB
1_10.txt AC 28 ms 5760 KB
1_11.txt AC 8 ms 1536 KB