/in/foo.cc: In function 'int main()':
/in/foo.cc:47:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |                 for(int i=0;i<vec.size();i++){
      |                             ~^~~~~~~~~~~
/in/foo.cc:48:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |                         for(int j=i+1;j<vec.size();j++){
      |                                       ~^~~~~~~~~~~