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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. using ll = long long;
  4.  
  5. int n, m;
  6. vector<vector<int>> a;
  7. vector<vector<char>> visited;
  8. static const int dr[4] = {1, -1, 0, 0};
  9. static const int dc[4] = {0, 0, 1, -1};
  10.  
  11. ll dfs(int r, int c)
  12. {
  13.     visited[r][c] = 1;
  14.     ll sum = a[r][c];
  15.     for (int i = 0; i < 4; i++)
  16.     {
  17.         int nr = r + dr[i], nc = c + dc[i];
  18.         if (nr >= 0 && nr < n && nc >= 0 && nc < m && a[nr][nc] > 0 && !visited[nr][nc])
  19.         {
  20.             sum += dfs(nr, nc);
  21.         }
  22.     }
  23.     return sum;
  24. }
  25.  
  26. int main()
  27. {
  28.     ios::sync_with_stdio(false);
  29.     cin.tie(nullptr);
  30.  
  31.     int t;
  32.     cin >> t;
  33.     while (t--)
  34.     {
  35.         cin >> n >> m;
  36.         a.assign(n, vector<int>(m));
  37.         visited.assign(n, vector<char>(m, 0));
  38.  
  39.         for (int i = 0; i < n; i++)
  40.             for (int j = 0; j < m; j++)
  41.                 cin >> a[i][j];
  42.  
  43.         ll best = 0;
  44.         for (int i = 0; i < n; i++)
  45.         {
  46.             for (int j = 0; j < m; j++)
  47.             {
  48.                 if (a[i][j] > 0 && !visited[i][j])
  49.                 {
  50.                     best = max(best, dfs(i, j));
  51.                 }
  52.             }
  53.         }
  54.  
  55.         cout << best << endl;
  56.     }
  57.     return 0;
  58. }
Success #stdin #stdout 0.05s 5312KB
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https://ideone.com/sOX2yR
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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