Submission #887221

#	Time	Username	Problem	Language	Result	Execution time	Memory
887221		viwlesxq	Star triangles (IZhO11_triangle)	C++17	100 / 100	240 ms	6052 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
using ll = int64_t;
#define all(x) x.begin(), x.end()
#define size(x) (int)x.size()

template<class S, class T> 
bool chmin(S &a, const T &b) {
    return (a > b ? (a = b) == b : false);
}
template<class S, class T> 
bool chmax(S &a, const T &b) {
    return (a < b ? (a = b) == b : false);
}
const ll inf = 1e9;
const int mod = 1e9 + 7;

signed main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    int n;
    cin >> n;
    map<int, int> mp_x, mp_y;
    ll res = 0;
    int x[n], y[n];
    for (int i = 0; i < n; ++i) {
        cin >> x[i] >> y[i];
        mp_x[x[i]]++, mp_y[y[i]]++;
    }
    for (int i = 0; i < n; ++i) {
        res += (ll)(mp_x[x[i]] - 1) * (mp_y[y[i]] - 1);
    }
    cout << res;
}

• Subtask 1: 100 / 100