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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void fastio() {
  5.     ios_base::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.     cout.tie(nullptr);
  8. }
  9.  
  10. int n;
  11. vector<vector<char>> grid;
  12. vector<vector<bool>> vis;
  13.  
  14. bool valid(int x, int y) {
  15.     return (x >= 0 && x < n && y >= 0 && y < n);
  16. }
  17.  
  18. int count_x = 0;
  19. void dfs(int x, int y) {
  20.     if (!valid(x, y) || grid[x][y] == '.' || vis[x][y])
  21.         return;
  22.  
  23.     vis[x][y] = true;
  24.     if (grid[x][y] == 'x')
  25.         count_x++;
  26.  
  27.     dfs(x + 1, y);
  28.     dfs(x - 1, y);
  29.     dfs(x, y + 1);
  30.     dfs(x, y - 1);
  31. }
  32.  
  33. int count_ships() {
  34.     int cnt = 0;
  35.     for (int i = 0; i < n; i++) {
  36.         for (int j = 0; j < n; j++) {
  37.             if ((grid[i][j] == 'x' || grid[i][j] == '@') && !vis[i][j]) {
  38.                 count_x = 0;
  39.                 dfs(i, j);
  40.                 if (count_x > 0)
  41.                     cnt++;
  42.             }
  43.         }
  44.     }
  45.     return cnt;
  46. }
  47.  
  48. void solve(int t) {
  49.     cin >> n;
  50.  
  51.     grid.resize(n, vector<char>(n));
  52.     vis.assign(n, vector<bool>(n, false));
  53.     for (int i = 0; i < n; ++i)
  54.         for (int j = 0; j < n; ++j)
  55.             cin >> grid[i][j];
  56.  
  57.     count_x = 0;
  58.     cout << "Case " << t << ": " << count_ships() << '\n';
  59.  
  60.     grid.clear();
  61.     vis.clear();
  62. }
  63.  
  64. int main() {
  65.     fastio();
  66.     int t = 1;
  67.     cin >> t;
  68.     for (int i = 1; i <= t; ++i)
  69.         solve(i);
  70.     return 0;
  71. }
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
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Case 1: 0
https://ideone.com/x3AWke
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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