Submission #503300

#	Time	Username	Problem	Language	Result	Execution time	Memory
503300		Pety	Red-blue table (IZhO19_stones)	C++14	100 / 100	32 ms	2236 KiB

stones

#include <bits/stdc++.h>

#define ll long long
#define ld long double

using namespace std;

const ll MOD = 1e9 + 7;
const ll INF = 1e9;
const int N = 1e5 + 2;

int t, n, m;
char a[1002][1002];


int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    cin >> n >> m;
    int ans = 0, lin = 0, col = 0;
    for (int i = 0; i <= n; i++)
      for (int j =0; j <= m; j++) {
        if (m / 2 + 1 <= m - j || n / 2 + 1 <= n - i) {
          if (ans < i + j) {
            ans = i + j;
            lin = i;
            col = j;
          }
        }
        else {
          int l = m / 2 + 1 - (m - j);
          int c = n / 2 + 1 - (n - i);
          int nr = (j + l * i - 1) / j;
          if (c <= i - nr && ans < i + j) {
            ans = i + j;
            lin = i;
            col = j;
          }
        }
      } 
    cout << ans <<  "\n";
    for (int i = 0; i < lin; i++)
      for (int j = m - 1; j >= col; j--)
        a[i][j] = '+';
    for (int j = 0; j < col; j++)
      for (int i = n - 1; i >= 0; i--)
        a[i][j] = '-';
    if (m / 2 + 1 > m - col) {
      int c = m / 2 + 1 - (m - col);
      int k = 0;
      for (int i = 0; i < lin; i++) {
        for (int j = 0; j < c; j++) {
          a[i][k] = '+';
          k = (k + 1) % col;
        }
      }
    }
    for (int i = lin; i < n; i++)
      for (int j = col; j < m; j++)
        a[i][j] = '-';
    for (int i = 0; i < n; i++, cout << "\n")
      for (int j = 0; j < m; j++)
        cout << a[i][j];
    
  }
  return 0;
}

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