foo.cc: In function 'void dfs1(int, int)':
foo.cc:21:30: error: expected ')' before '!' token
   21 |          if(map[y+i][x-chang]!
      |            ~                 ^
      |                              )
foo.cc:8:19: warning: unused variable 'k' [-Wunused-variable]
    8 |     int chang=1,i,k;
      |                   ^
foo.cc: In function 'void dfs2(int, int)':
foo.cc:38:30: error: expected ')' before '!' token
   38 |          if(map[y-chang][x-i]!
      |            ~                 ^
      |                              )
foo.cc:44:32: error: expected ')' before '!' token
   44 |          if(map[y+i+1][x-chang]!
      |            ~                   ^
      |                                )
foo.cc:34:19: warning: unused variable 'k' [-Wunused-variable]
   34 |     int chang=1,i,k;
      |                   ^

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