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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define all(n) n.begin(), n.end()
  5. #define el '\n'
  6. const int dx[] = {0, 0, 1, -1};
  7. const int dy[] = {1, -1, 0, 0};
  8. const int N = 1e6 + 5;
  9.  
  10. int main()
  11. {
  12.     ios::sync_with_stdio(false);
  13.     cin.tie(nullptr);
  14.  
  15.     int t;
  16.     cin >> t;
  17.  
  18.     while (t--)
  19.     {
  20.         int n, m;
  21.         cin >> n >> m;
  22.         vector<string> arr(n);
  23.         for (int i = 0; i < n; i++)
  24.         {
  25.             cin >> arr[i];
  26.         }
  27.         bool con = true;
  28.         for (int i = 0; i < n && con; i++)
  29.         {
  30.             for (int j = 0; j < m; j++)
  31.             {
  32.                 if (arr[i][j] == '1')
  33.                 {
  34.                     if (j == 0 || (i == 0 && j >= 0 && j < m))
  35.                     {
  36.                         continue;
  37.                     }
  38.                     else if (i - 1 >= 0 && j - 1 >= 0)
  39.                     {
  40.                         if (arr[i - 1][j] != '1' && arr[i][j - 1] != '1')
  41.                         {
  42.                             con = false;
  43.                             break;
  44.                         }
  45.                     }
  46.                     else
  47.                     {
  48.                         con = false;
  49.                         break;
  50.                     }
  51.                 }
  52.             }
  53.         }
  54.         if (con)
  55.             cout << "YES\n";
  56.         else
  57.             cout << "NO\n";
  58.     }
  59. }
  60.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/jUUTTt
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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