foo.cc: In function 'int main()':
foo.cc:21:19: error: 'x' was not declared in this scope
   21 |                 a[x][y]='#';
      |                   ^
foo.cc:21:22: error: 'y' was not declared in this scope; did you mean 'yn'?
   21 |                 a[x][y]='#';
      |                      ^
      |                      yn
foo.cc:30:40: error: 'ny' was not declared in this scope; did you mean 'nx'?
   30 |                         if(nx<1||nx>m||ny<1||ny>n||a[nx][ny]=='#')continue;
      |                                        ^~
      |                                        nx
foo.cc:31:48: error: 'ny' was not declared in this scope; did you mean 'nx'?
   31 |                         r++;q[r][0]=nx;q[r][1]=ny;q[r][2]=q[f][2]+1;a[nx][ny]='#';
      |                                                ^~
      |                                                nx

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