foo.cc: In function 'int Search(std::vector<int>&, int)':
foo.cc:13:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |  for (int i = 0 ; i < v.size () ; i ++ )
      |                   ~~^~~~~~~~~~~
foo.cc: In function 'void Output(std::vector<int>&)':
foo.cc:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i = 0 ; i < a.size () ; i ++ )
      |                     ~~^~~~~~~~~~~
foo.cc: In function 'void Div(int, int)':
foo.cc:48:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  for ( ; i < ys.size () ; i ++ )
      |          ~~^~~~~~~~~~~~

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