Submission #675752

#	Time	Username	Problem	Language	Result	Execution time	Memory
675752		QwertyPi	Star triangles (IZhO11_triangle)	C++14	100 / 100	458 ms	13348 KiB

triangle

#include <bits/stdc++.h>

using namespace std;

struct point{
	int x, y;
};

vector<point> P;

map<int, int> X, Y;
int main(){
	int n; cin >> n;
	for(int i = 0; i < n; i++){
		int x, y; cin >> x >> y;
		P.push_back({x, y});
		X[x]++; Y[y]++;
	}
	int ans = 0;
	for(int i = 0; i < n; i++){
		ans += (X[P[i].x] - 1) * (Y[P[i].y] - 1);
	}
	cout << ans << endl;
}

• Subtask 1: 100 / 100