Submission #891283


Source Code Expand

#include <cstdio>
#include <cstring>
#include <string>
#include <cmath>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <bitset>
using namespace std;

#define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,n) repl(i,0,n)
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
#define all(x) (x).begin(),(x).end()
#define dbg(x) cout<<#x"="<<x<<endl
#define fi first
#define se second

#define INF 2147483600

int main(){
  int n;
  cin>>n;
  vector<int> vec(n);
  rep(i,n) scanf("%d", &vec[i]);
  rep(i,n) vec[i]--;

  int res=0;
  rep(i,n){
    if(vec[vec[i]]==i) res++;
  }

  cout<<res/2<<endl;
  return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User tossy
Language C++14 (GCC 5.4.1)
Score 200
Code Size 773 Byte
Status AC
Exec Time 13 ms
Memory 640 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:31:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   rep(i,n) scanf("%d", &vec[i]);
                                ^

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 3 ms 256 KB
1_00.txt AC 3 ms 256 KB
1_01.txt AC 13 ms 640 KB
1_02.txt AC 13 ms 640 KB
1_03.txt AC 12 ms 640 KB
1_04.txt AC 13 ms 640 KB
1_05.txt AC 13 ms 640 KB
1_06.txt AC 13 ms 640 KB
1_07.txt AC 13 ms 640 KB
1_08.txt AC 6 ms 384 KB
1_09.txt AC 11 ms 512 KB
1_10.txt AC 10 ms 512 KB
1_11.txt AC 4 ms 256 KB