/in/foo.cc: In function 'int main()':
/in/foo.cc:20:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(long long int i=0,j=0;i<v1.size()&&j<v2.size();)
                               ~^~~~~~~~~~
/in/foo.cc:20:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(long long int i=0,j=0;i<v1.size()&&j<v2.size();)
                                            ~^~~~~~~~~~
/in/foo.cc:37:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(long long int i=0;i<v3.size();i++)
                           ~^~~~~~~~~~