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Submission #935112

# Submission time Handle Problem Language Result Execution time Memory
935112 2024-02-28T16:47:17 Z ind1v Star triangles (IZhO11_triangle) C++11
100 / 100
 220 ms 14400 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 3e5 + 5;

int n;
int x[N], y[N];
int cx[N], cy[N];

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> x[i] >> y[i];
  }
  vector<int> vx;
  copy(x + 1, x + n + 1, back_inserter(vx));
  sort(vx.begin(), vx.end());
  vx.erase(unique(vx.begin(), vx.end()), vx.end());
  vector<int> vy;
  copy(y + 1, y + n + 1, back_inserter(vy));
  sort(vy.begin(), vy.end());
  vy.erase(unique(vy.begin(), vy.end()), vy.end());
  for (int i = 1; i <= n; i++) {
    cx[lower_bound(vx.begin(), vx.end(), x[i]) - vx.begin()]++;
    cy[lower_bound(vy.begin(), vy.end(), y[i]) - vy.begin()]++;
  }
  long long ans = 0;
  for (int i = 1; i <= n; i++) {
    ans += (cx[lower_bound(vx.begin(), vx.end(), x[i]) - vx.begin()] - 1) * (cy[lower_bound(vy.begin(), vy.end(), y[i]) - vy.begin()] - 1);
  }
  cout << ans << '\n';
  return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4440 KB Output is correct
4 Correct 2 ms 4440 KB Output is correct
5 Correct 1 ms 4560 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 5 ms 4700 KB Output is correct
13 Correct 5 ms 4700 KB Output is correct
14 Correct 7 ms 4776 KB Output is correct
15 Correct 66 ms 7756 KB Output is correct
16 Correct 70 ms 8024 KB Output is correct
17 Correct 65 ms 7756 KB Output is correct
18 Correct 71 ms 7644 KB Output is correct
19 Correct 192 ms 13384 KB Output is correct
20 Correct 134 ms 10724 KB Output is correct
21 Correct 220 ms 13900 KB Output is correct
22 Correct 210 ms 14400 KB Output is correct