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0_0_39516856_12052.cpp: In function 'void dfs(int, int, int, int)':
0_0_39516856_12052.cpp:18:21: error: 'x' was not declared in this scope; did you mean 'xx'?
   18 |         if(cnt==2&&(x-x2)!=0&&(y-y2)!=0) return ;
      |                     ^
      |                     xx
0_0_39516856_12052.cpp:18:32: error: 'y' was not declared in this scope; did you mean 'yy'?
   18 |         if(cnt==2&&(x-x2)!=0&&(y-y2)!=0) return ;
      |                                ^
      |                                yy