foo.cc:13:10: error: ISO C++ forbids declaration of 'Initial' with no type [-fpermissive]
   13 |  Initial(){ for(int i = 0;i<10000;i++) v.push_back(0); }
      |          ^
foo.cc: In member function 'int BigInt::Initial()':
foo.cc:13:56: warning: no return statement in function returning non-void [-Wreturn-type]
   13 |  Initial(){ for(int i = 0;i<10000;i++) v.push_back(0); }
      |                                                        ^

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