Submission #1005375

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005375		tvladm2009	Star triangles (IZhO11_triangle)	C++17	100 / 100	238 ms	12176 KiB

triangle

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

const int N = 3e5 + 7;

int n, x[N], y[N];
map<int, int> cntX, cntY;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        cin >> x[i] >> y[i];
        cntX[x[i]]++;
        cntY[y[i]]++;
    }
    ll ans = 0;
    for (int i = 1; i <= n; ++i) {
        ans += 1LL * (cntX[x[i]] - 1) * (cntY[y[i]] - 1);
    }
    cout << ans  << "\n";
    return 0;
}

• Subtask 1: 100 / 100