Submission #976934

#	Time	Username	Problem	Language	Result	Execution time	Memory
976934		ArgoCahaya	Star triangles (IZhO11_triangle)	C++14	100 / 100	277 ms	17152 KiB

triangle

#include<bits/stdc++.h>
#define ll long long
#define endl "\n"
#define fi first
#define se second
#define pb push_back
#define pll pair<long long, long long>
using namespace std;


void solve(){
	ll n;
	cin >> n;
	map<ll,ll> x;
	map<ll,ll> y;
	vector<pll> v;
	for(int i=1;i<=n;i++){
		ll a,b;
		cin >> a >> b;
		x[a]++;
		y[b]++;
		v.pb({a,b});
	}
	ll ans = 0;
	for(auto i:v){
		ans += (x[i.fi]-1) * (y[i.se]-1);
	}
	cout << ans << endl;
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int tc = 1;
//	cin >> tc;
	while(tc--){
	   solve();
	}
}

• Subtask 1: 100 / 100