foo.cc: In function 'void Output(std::vector<int>&)':
foo.cc:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for(int i=0; i<a.size(); i++)
      |                      ~^~~~~~~~~
foo.cc: In function 'int GetLIS(int*, int)':
foo.cc:35:13: warning: unused variable 'imax' [-Wunused-variable]
   35 |         int imax = it- len.begin();
      |             ^~~~

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