Submission #838650

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
838650	2023-08-27 14:07:06	fanwen	Star triangles (IZhO11_triangle)	C++17	100 / 100	268 ms	12176 KiB

triangle

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/**
 *      author : pham van sam 
 *      created : 27 August 2023 (Sunday)
 **/
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 3e5 + 5;
int N, x[MAXN], y[MAXN];
map <int, int> cnt_x, cnt_y;
void you_make_it(void) {
    cin >> N;
    for (int i = 1; i <= N; ++i) {
      cin >> x[i] >> y[i];
      cnt_x[x[i]]++, cnt_y[y[i]]++;
    }
    long long ans = 0;
    for (int i = 1; i <= N; ++i) {
      ans += 1LL * (cnt_x[x[i]] - 1) * (cnt_y[y[i]] - 1);
    }
    cout << ans;
}
signed main() {
#ifdef LOCAL
 
 
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• Subtask 1: 100 / 100