Submission #333888

#	Time	Username	Problem	Language	Result	Execution time	Memory
333888		BY_KUTBILIM	Star triangles (IZhO11_triangle)	C++14	100 / 100	375 ms	6252 KiB

triangle

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

#define ff first
#define ss second
#define pb push_back
#define ll long long

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

    int n;
    cin >> n;
    int x[n], y[n];
    map<int,int> ox, oy;
    for(int i = 0; i < n; i++){
        cin >> x[i] >> y[i];
        ox[x[i]]++;
        oy[y[i]]++;
    }
    ll ans = 0;
    for(int i = 0; i < n; i++){
        ans += 1LL * (ox[x[i]] - 1) * (oy[y[i]] - 1);
    }
    cout << ans << endl;
    
    return 0;
}

• Subtask 1: 100 / 100