oj.uz

Submission #891142

# Submission time Handle Problem Language Result Execution time Memory
891142 2023-12-22T08:41:41 Z JAVA_FF Star triangles (IZhO11_triangle) C++14
100 / 100
 201 ms 13412 KB 
#include "bits/stdc++.h"

using namespace std;

int countRightTriangles(vector<pair<int, int>>& stars) {
    unordered_map<int, int> xFreq, yFreq;

    for (const auto& star : stars) {
        xFreq[star.first]++;
        yFreq[star.second]++;
    }

    int count = 0;

    for (const auto& star : stars) {
        count += (xFreq[star.first] - 1) * (yFreq[star.second] - 1);
    }

    return count;
}

int main() {
    int N;
    cin >> N;

    vector<pair<int, int>> stars;
    for (int i = 0; i < N; ++i) {
        int x, y;
        cin >> x >> y;
        stars.emplace_back(x, y);
    }

    int result = countRightTriangles(stars);
    cout << result << endl;

    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 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 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 600 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 6 ms 824 KB Output is correct
13 Correct 7 ms 1368 KB Output is correct
14 Correct 8 ms 1372 KB Output is correct
15 Correct 71 ms 5884 KB Output is correct
16 Correct 75 ms 6084 KB Output is correct
17 Correct 70 ms 5828 KB Output is correct
18 Correct 69 ms 5876 KB Output is correct
19 Correct 184 ms 12220 KB Output is correct
20 Correct 133 ms 8900 KB Output is correct
21 Correct 194 ms 13412 KB Output is correct
22 Correct 201 ms 12412 KB Output is correct