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  1. #include <bits/stdc++.h>
  2. #define pi pair<int, int>
  3. #define x first
  4. #define y second
  5.  
  6. using namespace std;
  7.  
  8. int main()
  9. {
  10.     int t;
  11.     cin>>t;
  12.     std::vector<string> re;
  13.     for(int i=0;i<t;i++){
  14.         int n,m;
  15.         cin>>n>>m;
  16.         char ar[n][m];
  17.         bool v[n][m];
  18.         int numG,numB;
  19.  
  20.         for(int j=0;j<n;j++){
  21.           for(int k=0;k<m;k++){
  22.               v[j][k] = false;
  23.               cin>>ar[j][k];
  24.               if(ar[j][k]=='G') numG++;
  25.               else if(ar[j][k]=='B') numB++;
  26.               else if(ar[j][k]=='#')  v[j][k] = true;
  27.  
  28.           }  
  29.         }
  30.  
  31.         // cout<<"\n-----------------------------------------------------\n";
  32.         // for(int j=0;j<n;j++){
  33.         //     cout<<"\n";
  34.         //   for(int k=0;k<m;k++){
  35.         //      cout<<" "<<ar[j][k];
  36.  
  37.         //   }  
  38.         // }
  39.  
  40.         bool needBreak = false;
  41.         if(numG==0) {
  42.             re.push_back("Yes");
  43.             needBreak = true;
  44.             continue;
  45.         }
  46.  
  47.         int dx[] = {0,0,1,-1};
  48.         int dy[] = {1,-1,0,0};
  49.  
  50.  
  51.  
  52.         for(int j=0;j<n;j++){
  53.           for(int k=0;k<m;k++){
  54.               if(ar[j][k]=='B'){
  55.                   if(needBreak) break;
  56.                   v[j][k] = true;
  57.                   for(int h=0;h<4;h++){
  58.                       //cout<<"\n j "<<j<<" k "<<k <<" h "<<h;
  59.                       int x = j+dx[h];
  60.                       int y = k+dy[h];
  61.                       if(x<0 || y<0||x>=n||y>=m) continue;
  62.                       //cout<<"\n --> x "<<x<<" y "<<y;
  63.                       if(ar[x][y]=='G') {
  64.                           needBreak = true;
  65.                           re.push_back("No");
  66.                           //cout<<"\n -->break: x "<<x<<" y "<<y;
  67.                           break;
  68.                       } else if(ar[x][y]=='.') {
  69.                           ar[x][y]='#';
  70.                           v[x][y] = true;
  71.                       }
  72.  
  73.                   }
  74.  
  75.               }
  76.           }  
  77.         }
  78.  
  79.         if(needBreak) continue;
  80.         else {
  81.             if(ar[n-1][m-1]=='#'){
  82.                 re.push_back("No");
  83.                 continue;
  84.             }
  85.             int count = 0;
  86.             std::queue<pi> q ;
  87.             q.push({n-1, m-1});
  88.             v[n-1][m-1] = true;
  89.             while(!q.empty()){
  90.                 pi top = q.front();
  91.                 q.pop();
  92.  
  93.                 for(int h=0;h<4;h++){
  94.                       //cout<<"\n j "<<j<<" k "<<k <<" h "<<h;
  95.                       int x = top.x+dx[h];
  96.                       int y = top.y+dy[h];
  97.                       if(x<0 || y<0||x>=n||y>=m || v[x][y]) continue;
  98.                       //cout<<"\n --> x "<<x<<" y "<<y;
  99.                       q.push({x,y});
  100.                       v[x][y] = true;
  101.                       if(ar[x][y]=='G') {
  102.                           count++;
  103.                           //cout<<"\n -->break: x "<<x<<" y "<<y;
  104.                       } 
  105.  
  106.                  }
  107.             }
  108.             if(count>=numG) re.push_back("Yes");
  109.             else re.push_back("No");
  110.  
  111.         }
  112.  
  113.     }
  114.  
  115.     for(auto s:re){
  116.         cout<<s<<"\n";
  117.     }
  118.  
  119.     return 0;
  120. }
Success #stdin #stdout 0.01s 5276KB
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https://ideone.com/6uNiYQ
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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