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Submission #887786

# Submission time Handle Problem Language Result Execution time Memory
887786 2023-12-15T08:24:06 Z stdfloat Star triangles (IZhO11_triangle) C++17
100 / 100
 382 ms 25440 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);

    int n;
    cin >> n;

    map<int, int> my;
    map<int, set<int>> mx;
    for (int i = 0; i < n; i++) {
        int x, y;
        cin >> x >> y;

        my[y]++;
        mx[x].insert(y);
    }

    int ans = 0;
    for (auto i : mx) {
        vector<int> p;
        for (auto j : i.second) p.push_back((p.empty() ? 0 : p.back()) + my[j] - 1);

        int x = -1;
        for (auto j : i.second) ans += (x == -1 ? 0 : p[x]) + p.back() - p[++x];
    }

    cout << ans;
}

Compilation message

triangle.cpp: In function 'int main()':
triangle.cpp:28:76: warning: operation on 'x' may be undefined [-Wsequence-point]
   28 |         for (auto j : i.second) ans += (x == -1 ? 0 : p[x]) + p.back() - p[++x];
      |                                                                            ^~~
triangle.cpp:28:19: warning: unused variable 'j' [-Wunused-variable]
   28 |         for (auto j : i.second) ans += (x == -1 ? 0 : p[x]) + p.back() - p[++x];
      |                   ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 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 360 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Correct 7 ms 1372 KB Output is correct
13 Correct 6 ms 1884 KB Output is correct
14 Correct 9 ms 2140 KB Output is correct
15 Correct 102 ms 11668 KB Output is correct
16 Correct 122 ms 12116 KB Output is correct
17 Correct 97 ms 11692 KB Output is correct
18 Correct 98 ms 11604 KB Output is correct
19 Correct 302 ms 24060 KB Output is correct
20 Correct 221 ms 18892 KB Output is correct
21 Correct 329 ms 25428 KB Output is correct
22 Correct 382 ms 25440 KB Output is correct