Submission #336951

#	Time	Username	Problem	Language	Result	Execution time	Memory
336951		kutbilim_one	Star triangles (IZhO11_triangle)	C++14	100 / 100	423 ms	9708 KiB

triangle

/** @kutbilimone **/
#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define all(x) x.begin(),x.end()
#define int long long

signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	int x[n], y[n];
	map<int, int> cntx, cnty;
	for(int i = 0; i < n; i++){
		cin >> x[i] >> y[i];
		cntx[x[i]]++, cnty[y[i]]++;
	}

	int res = 0;
	for(int i = 0; i < n; i++){	
		res += (cntx[x[i]]-1) * (cnty[y[i]]-1);		
	}

	cout << res << endl;

	return 0;
}

• Subtask 1: 100 / 100