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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int long long
  4. #define pii pair <int, int>
  5. #define fi first
  6. #define se second
  7. const int MAXN=  1e3+5;
  8. int dx[] = {0,-1,1,0};
  9. int dy[] = {1,0,0,-1};
  10.  
  11. char g[MAXN][MAXN];
  12. queue <pii> q;
  13. int n, m, a1, b1, c1, d1;
  14.  
  15. void bfs(int x1, int y1){
  16.     q.push({x1, y1});
  17.     while(!q.empty()){
  18.         pii t = q.front();
  19.         q.pop();
  20.         for (int i =0; i <4; i++){
  21.             int a = t.first + dx[i], b = t.second +dy[i];
  22.             if (a== c1 && b == d1 && g[a][b] == 'X'){
  23.                 cout << "YES" << endl;
  24.                 exit(0);
  25.  
  26.             }
  27.             if ( a >= 1 && a <= n && b >= 1 && b <= m && g[a][b] == '.'){
  28.                 g[a][b] = 'X';
  29.                 q.push({a, b});
  30.             }
  31.         }
  32.     }
  33.     cout << "NO" << endl;
  34.     exit(0);
  35. }
  36. signed main(){
  37.     cin >> n >> m;
  38.     for (int i =1; i <= n; i++){
  39.         for (int j =1; j <= m; j++){
  40.             cin >> g[i][j];
  41.         }
  42.     }
  43.     cin >> a1 >> b1 >> c1 >> d1;
  44.     bfs(a1,b1);
  45.     return 0;
  46. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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4 6
X...XX
...XX.
.X..X.
......
1 6
2 2
stdout
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YES
https://ideone.com/sKX5Tz
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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