Submission #890929


Source Code Expand

#include<bits/stdc++.h>

#define REP(i,s,n) for(int i=s;i<n;i++)
#define rep(i,n) REP(i,0,n)

using namespace std;

int main(){
  int n;
  cin >> n;
  vector<int> vec(n);
  rep(i,n) {
    cin>> vec[i];
    --vec[i];
  }
  int cnt = 0;
  rep(i,n) {
    if( i == vec[vec[i]] ) {
      ++cnt;
    }
  }
  cout << (int)(cnt)/2 << endl;
  return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User ChiyomiAnzai
Language C++14 (GCC 5.4.1)
Score 200
Code Size 370 Byte
Status AC
Exec Time 31 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 3 ms 384 KB
1_01.txt AC 31 ms 640 KB
1_02.txt AC 30 ms 640 KB
1_03.txt AC 30 ms 640 KB
1_04.txt AC 30 ms 640 KB
1_05.txt AC 30 ms 640 KB
1_06.txt AC 30 ms 640 KB
1_07.txt AC 30 ms 640 KB
1_08.txt AC 13 ms 384 KB
1_09.txt AC 25 ms 512 KB
1_10.txt AC 22 ms 512 KB
1_11.txt AC 7 ms 256 KB