Submission #1032023

#	Time	Username	Problem	Language	Result	Execution time	Memory
1032023		phoenix	Red-blue table (IZhO19_stones)	C++17	100 / 100	31 ms	2388 KiB

stones

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#define cerr cout
#else 
#define cerr if (false) cout
#endif

void solve() {
    int n, m;
    cin >> n >> m;
    int ra = 0, rb = m;
    for (int a = 1; a <= n; a++) {
        int l = 0, r = m + 1;
        while (r - l > 1) {
            int b = (l + r) / 2;
            int k = max(0, m / 2 + 1 - m + b);
            if ((n - n / 2 - 1) * b >= k * a)
                l = b;
            else 
                r = b;
        }
        if (a + l > ra + rb)
            ra = a, rb = l;
    }
    cerr << ra << ' ' << rb << '\n';
    char arr[n][m];
    for (int i = 0; i < n; i++) for (int j = 0; j < m; j++)
        arr[i][j] = '-';
    for (int i = 0; i < ra; i++)
        for (int j = rb; j < m; j++)
            arr[i][j] = '+';
    int k = max(0, m / 2 + 1 - m + rb);
    int l = 0;
    for (int i = 0; i < ra; i++) {
        for (int j = 0; j < k; j++) {
            arr[i][l] = '+';
            l = (l + 1) % rb;
        }
    }
    cout << ra + rb << '\n';
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++)
            cout << arr[i][j];
        cout << '\n';
    }
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int number_of_tests;
    cin >> number_of_tests;
    for (int current_test = 0; current_test < number_of_tests; current_test++) {
        cerr << "++++++++++++ #" << current_test << " ++++++++++++++++\n";
        solve();
        cerr << "++++++++++++++++++++++++++++++++\n\n";
    }
}

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 31 / 31