Submission #990471

#	Time	Username	Problem	Language	Result	Execution time	Memory
990471		tch1cherin	Red-blue table (IZhO19_stones)	C++17	26 / 100	16 ms	1372 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;
    if (N == 4 && M == 3) {
      cout << "5\n++-\n++-\n++-\n++-\n";
    } else if (N == 3 && M == 4) {
      cout << "5\n---\n---\n---\n+++\n";
    } else if (N <= 2 || M <= 2) {
      cout << max(N, M) << "\n";
      for (int i = 0; i < N; i++, cout << "\n") {
        for (int j = 0; j < M; j++) {
          cout << "-+"[N > M];
        }
      }
    } else if (N % 2 == 0 && M % 2 == 0 && min(N, M) * 2 <= max(N, M) + 6) {
      cout << N + M - 3 << "\n";
      if (N > M) {
        string rot(M - 3, '+');
        fill(rot.begin(), rot.begin() + M / 2 - 1, '-');
        for (int i = 0; i < N; i++) {
          cout << "+++" << rot << "\n";
          rotate(rot.begin(), rot.begin() + M / 2 - 1, rot.end());
        }
      } else {
        string rot(N - 3, '-');
        fill(rot.begin(), rot.begin() + N / 2 - 1, '+');
        vector<string> s(N, string(M, 0));
        for (int j = 0; j < M; j++) {
          s[0][j] = s[1][j] = s[2][j] = '-';
          for (int i = 3; i < N; i++) {
            s[i][j] = rot[i - 3];
          }
          rotate(rot.begin(), rot.begin() + N / 2 - 1, rot.end());
        }
        for (int i = 0; i < N; i++) {
          cout << s[i] << "\n";
        }
      }
    } else {
      int H = N - (2 - N % 2), W = M - (2 - M % 2);
      cout << H + W << "\n";
      for (int i = 0; i < N; i++, cout << "\n") {
        for (int j = 0; j < M; j++) {
          cout << "-+"[i < H && (j >= W || (i + j) % 2)];
        }
      }
    }
  }
}

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