Submission #891798


Source Code Expand

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <string>
#include <numeric>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

int main() {
    int N;
    vector<int> a;
    
    cin >> N;
    a.push_back(0);
    for (int i = 1; i <= N; i++) {
        int v;
        cin >> v;
        a.push_back(v);
    }
    
    int num_pair = 0;
    for (int i = 1; i <= N; i++) {
        int j = a[i];
        if (i < j && a[j] == i) num_pair++;
    }
    cout << num_pair << endl;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User iihi49
Language C++14 (GCC 5.4.1)
Score 200
Code Size 616 Byte
Status AC
Exec Time 31 ms
Memory 1020 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 3 ms 256 KB
1_01.txt AC 31 ms 892 KB
1_02.txt AC 31 ms 892 KB
1_03.txt AC 31 ms 892 KB
1_04.txt AC 31 ms 892 KB
1_05.txt AC 31 ms 892 KB
1_06.txt AC 31 ms 892 KB
1_07.txt AC 31 ms 892 KB
1_08.txt AC 13 ms 640 KB
1_09.txt AC 26 ms 1020 KB
1_10.txt AC 22 ms 892 KB
1_11.txt AC 7 ms 384 KB