Submission #990407

#	Time	Username	Problem	Language	Result	Execution time	Memory
990407		tch1cherin	Red-blue table (IZhO19_stones)	C++17	43 / 100	17 ms	1368 KiB

stones

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int T;
  cin >> T;
  while (T--) {
    int N, M;
    cin >> N >> M;
    int H = N - 2 + N % 2, W = M - 2 + M % 2;
    if (H + W < max(N, M)) {
      if (N > M) {
        cout << N << "\n";
        for (int i = 0; i < N; i++) {
          cout << string(M, '+') << "\n";
        }
      } else {
        cout << M << "\n";
        for (int i = 0; i < N; i++) {
          cout << string(M, '-') << "\n";
        }
      }
    } else if (N == 4 && M == 3) {
      cout << "5\n+-+\n+-+\n+-+\n+-+\n";
    } else if (N == 3 && M == 4) {
      cout << "5\n----\n++++\n----\n";
    } else if (N == 4 && M == 4) {
      cout << "5\n+++-\n+++-\n+++-\n+++-\n";
    } else if (N == 6 && M == 6) {
      cout << "9\n++++--\n+++-+-\n+++--+\n++++--\n+++-+-\n+++--+\n";
    } else {
      cout << H + W << "\n";
      for (int i = 0; i < N; i++) {
        for (int j = 0; j < M; j++) {
          if (i < H && j < W) {
            cout << "+-"[(i + j) % 2];
          } else if (i < H) {
            cout << "+";
          } else {
            cout << "-";
          }
        }
        cout << "\n";
      }
    }
  }
}

• Subtask 1: 17 / 17
• Subtask 2: 0 / 10
• Subtask 3: 0 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 0 / 31