foo.cc:9:9: error: expected unqualified-id before '{' token
    9 |         {
      |         ^
foo.cc:76:15: error: expected ';' at end of member declaration
   76 |         HZBDS()
      |               ^
      |                ;
foo.cc: In member function 'int HZBDS::pop()':
foo.cc:20:28: error: 't' was not declared in this scope; did you mean 'tm'?
   20 |                 char x = a[t];
      |                            ^
      |                            tm

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