/in/foo.cc: In function 'void poto()':
/in/foo.cc:18:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |                 for(int j=0;j<ve[i].size();j++){
      |                             ~^~~~~~~~~~~~~
/in/foo.cc:6:9: warning: unused variable 'ans' [-Wunused-variable]
    6 |     int ans=0,k=0;
      |         ^~~