foo.cc: In function 'void dfs1(int, int)':
foo.cc:23:30: error: expected ')' before '!' token
   23 |          if(map[y+i][x-chang]!
      |            ~                 ^
      |                              )
foo.cc:10:19: warning: unused variable 'k' [-Wunused-variable]
   10 |     int chang=1,i,k;
      |                   ^
foo.cc: In function 'void dfs2(int, int)':
foo.cc:40:30: error: expected ')' before '!' token
   40 |          if(map[y-chang][x-i]!
      |            ~                 ^
      |                              )
foo.cc:46:32: error: expected ')' before '!' token
   46 |          if(map[y+i+1][x-chang]!
      |            ~                   ^
      |                                )
foo.cc:36:19: warning: unused variable 'k' [-Wunused-variable]
   36 |     int chang=1,i,k;
      |                   ^

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