/in/foo.cc: In function 'int main()':
/in/foo.cc:88:23: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
   printf("%d",v.size());
                       ^
/in/foo.cc:89:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<v.size();i++){
           ~^~~~~~~~~