Submission #531775

#	Time	Username	Problem	Language	Result	Execution time	Memory
531775		makanhulia	Star triangles (IZhO11_triangle)	C++17	100 / 100	578 ms	6872 KiB

triangle

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    int n; cin >> n;
    pair<int, int>pii[n];
    map<int, ll>cntX, cntY;

    for(int i = 0; i < n; i++){
        auto &[x, y] = pii[i];
        cin >> x >> y;
        cntX[x]++;
        cntY[y]++;
    }

    ll ans = 0;

    for(int i = 0; i < n; i++){
        auto &[x, y] = pii[i];
        ans += max(0LL, (cntX[x] - 1)*(cntY[y] - 1));
    }

    cout << ans << endl;

    return 0;
}

• Subtask 1: 100 / 100