Submission #314785

#	Time	Username	Problem	Language	Result	Execution time	Memory
314785		jovan_b	Star triangles (IZhO11_triangle)	C++17	100 / 100	455 ms	13304 KiB

triangle

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

typedef long long ll;
typedef long double ld;

map <int, ll> kx;
map <int, ll> ky;
int x[300005];
int y[300005];

int main(){
    ios_base::sync_with_stdio(false), cin.tie(0);
    cout.precision(10);
    cout << fixed;

    int n;
    cin >> n;
    for(int i=1; i<=n; i++){
        cin >> x[i] >> y[i];
        kx[x[i]]++, ky[y[i]]++;
    }
    ll res = 0;
    for(int i=1; i<=n; i++){
        res += (kx[x[i]]-1)*(ky[y[i]]-1);
    }
    cout << res;
    return 0;
}

• Subtask 1: 100 / 100