Submission #899210

#	Time	Username	Problem	Language	Result	Execution time	Memory
899210		pcc	Star triangles (IZhO11_triangle)	C++14	100 / 100	254 ms	5980 KiB

triangle

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

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>


const int mxn = 3e5+10;
map<int,int> xcnt,ycnt;
pii arr[mxn];

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n;
	cin>>n;
	for(int i = 0;i<n;i++){
		cin>>arr[i].fs>>arr[i].sc;
		xcnt[arr[i].fs]++;
		ycnt[arr[i].sc]++;
	}
	ll ans = 0;
	for(int i = 0;i<n;i++){
		ans += 1ll*(xcnt[arr[i].fs]-1)*(ycnt[arr[i].sc]-1);
	}
	cout<<ans;
}

• Subtask 1: 100 / 100