Submission #552665

#	Time	Username	Problem	Language	Result	Execution time	Memory
552665		KN200711	Star triangles (IZhO11_triangle)	C++14	100 / 100	546 ms	12232 KiB

triangle

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

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

• Subtask 1: 100 / 100