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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. static const int dx[8] = {1, 1, 1, 0, 0, -1, -1, -1};
  11. static const int dy[8] = {1, 0, -1, 1, -1, 1, 0, -1};
  12.  
  13. int n;
  14. vector<vector<char>> grid;
  15. vector<vector<bool>> vis;
  16.  
  17. bool valid(int x, int y) {
  18.     return (x >= 0 && x < n && y >= 0 && y < n);
  19. }
  20.  
  21. void dfs(int x, int y) {
  22.     if (!valid(x, y) || vis[x][y] || grid[x][y] == '0')
  23.         return;
  24.     vis[x][y] = true;
  25.     for (int i = 0; i < 8; i++) {
  26.         dfs(x + dx[i], y + dy[i]);
  27.     }
  28. }
  29.  
  30. int count_war_eagles() {
  31.     int cnt = 0;
  32.     for (int i = 0; i < n; i++) {
  33.         for (int j = 0; j < n; j++) {
  34.             if (grid[i][j] == '1' && !vis[i][j]) {
  35.                 cnt++;
  36.                 dfs(i, j);
  37.             }
  38.         }
  39.     }
  40.     return cnt;
  41. }
  42.  
  43. void solve() {
  44.     int t = 1;
  45.     while (cin >> n) {
  46.         grid.assign(n, vector<char>(n));
  47.         vis.assign(n, vector<bool>(n, false));
  48.         for (int i = 0; i < n; i++) {
  49.             string line;
  50.             cin >> line;
  51.             for (int j = 0; j < n; j++)
  52.                 grid[i][j] = line[j];
  53.         }
  54.         cout << "Image number " << t++ << " contains " << count_war_eagles() << " war eagles.\n";
  55.     }
  56. }
  57.  
  58. int main() {
  59.     #ifndef ONLINE_JUDGE
  60.     freopen("Bumble.in", "r", stdin);
  61.     #endif
  62.     fastio();
  63.     solve();
  64.     return 0;
  65. }
  66.  
Success #stdin #stdout 0.01s 5260KB
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https://ideone.com/39Ukq6
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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