/in/foo.cc: In function 'int Depth(char (*)[2], int)':
/in/foo.cc:6:24: warning: unused variable 'm' [-Wunused-variable]
  int depth = 2, k = 0, m = 0, s[30];
                        ^
/in/foo.cc:14:15: warning: 's[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int max = s[0];
               ^