foo.cc: In function 'int unite(int, int)':
foo.cc:26:1: warning: no return statement in function returning non-void [-Wreturn-type]
   26 | }
      | ^
foo.cc: In function 'bool cmp(Edge, Edge)':
foo.cc:30:1: warning: control reaches end of non-void function [-Wreturn-type]
   30 | }
      | ^

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