Submission #1152718


Source Code Expand

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

#define ll long long
#define pb push_back
#define mp make_pair
#define ff first
#define ss second

typedef pair<int,int>pii;

const int maxn=1e5+55;
int a;
int main() {
	// freopen("Task.in","r",stdin);freopen("Task.out","w",stdout);
	int n;
	cin>>n;
	map<int,set<int> >mpp;
	for(int i=1 ; i<=n ; i++) {
		cin>>a;

		mpp[i].insert(a);
	}
	int cnt=0;
	for(map<int, set<int> >::iterator it=mpp.begin() ; it!=mpp.end() ; it++) {
		int u=it->ff;
		for(set<int>::iterator it2=it->ss.begin() ; it2!=it->ss.end() ; it2++) {
			int v=*it2;
			if(mpp[v].find(u)!=mpp[v].end()) {	
				++cnt;
				mpp[v].erase(u);
				mpp[u].erase(v);
			}
		} 
	}
	
	/*for (int i=1 ; i<=n ; i++) {
		if(a[a[i]]==i)
			cnt++;
	}*/
	// cnt/=2;
	cout<<cnt<<endl;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User killjee
Language C++14 (GCC 5.4.1)
Score 200
Code Size 822 Byte
Status AC
Exec Time 114 ms
Memory 14336 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 1 ms 256 KB
0_01.txt AC 1 ms 256 KB
0_02.txt AC 1 ms 256 KB
1_00.txt AC 1 ms 256 KB
1_01.txt AC 103 ms 14336 KB
1_02.txt AC 113 ms 14336 KB
1_03.txt AC 114 ms 14336 KB
1_04.txt AC 114 ms 14336 KB
1_05.txt AC 113 ms 14336 KB
1_06.txt AC 114 ms 14336 KB
1_07.txt AC 114 ms 14336 KB
1_08.txt AC 37 ms 5504 KB
1_09.txt AC 90 ms 11776 KB
1_10.txt AC 74 ms 9984 KB
1_11.txt AC 15 ms 2560 KB