oj.uz

Submission #963152

# Submission time Handle Problem Language Result Execution time Memory
963152 2024-04-14T15:17:04 Z biank Star triangles (IZhO11_triangle) C++14
100 / 100
 154 ms 10432 KB 
#include <bits/stdc++.h>

using namespace std;

#define sz(x) int(x.size())
#define all(x) begin(x), end(x)

using ll = long long;

int compress(vector<int> &v) {
    vector<int> vals(all(v));
    sort(all(vals));
    vals.erase(unique(all(vals)), end(vals));
    for (int &x : v) x = int(lower_bound(all(vals), x) - begin(vals));
    return sz(vals);
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    int n;
    cin >> n;
    vector<int> x(n), y(n);
    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
    }
    int cantX = compress(x), cantY = compress(y);
    vector<int> freqX(cantX, 0), freqY(cantY, 0);
    for (int i = 0; i < n; i++) {
        freqX[x[i]]++, freqY[y[i]]++;
    }
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        ans += (freqX[x[i]] - 1LL) * (freqY[y[i]] - 1LL);
    }
    cout << ans << '\n';
    
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 544 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 4 ms 604 KB Output is correct
13 Correct 4 ms 648 KB Output is correct
14 Correct 4 ms 600 KB Output is correct
15 Correct 52 ms 3780 KB Output is correct
16 Correct 57 ms 4008 KB Output is correct
17 Correct 47 ms 3776 KB Output is correct
18 Correct 49 ms 4032 KB Output is correct
19 Correct 134 ms 9552 KB Output is correct
20 Correct 103 ms 7008 KB Output is correct
21 Correct 141 ms 10432 KB Output is correct
22 Correct 154 ms 10396 KB Output is correct