Submission #890769


Source Code Expand

#include<bits/stdc++.h>

using namespace std;

struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}init;

typedef long long LL;

template<typename T>void chmin(T &a,T b){a=min(a,b);}
template<typename T>void chmax(T &a,T b){a=max(a,b);}
template<typename T>
istream& operator>>(istream &is,vector<T> &v){
    for(auto &it:v)is>>it;
    return is;
}

int main(){
    int N;cin>>N;
    vector<int> a(N);
    cin>>a;
    int res=0;
    for(int i=0;i<N;i++)
        if(a[a[i]-1]-1==i)res++;
    cout<<res/2<<endl;
    return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User btk15049
Language C++14 (GCC 5.4.1)
Score 200
Code Size 558 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 2 ms 256 KB
0_02.txt AC 2 ms 256 KB
1_00.txt AC 3 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