foo.cc: In function 'void solve(std::vector<int>&, int)':
foo.cc:9:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |                 for(int i=0;i<v.size();i++)
      |                             ~^~~~~~~~~
foo.cc:15:22: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   15 |                 if((k+j)%2==1)
      |                    ~~^~~
foo.cc:15:22: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]

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