/in/foo.cc: In function 'int main()':
/in/foo.cc:17:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         for(int j=0;j<num.size();j++)
      |                     ~^~~~~~~~~~~
/in/foo.cc:10:13: warning: unused variable 'ci' [-Wunused-variable]
   10 |         int ci,ei;
      |             ^~
/in/foo.cc:10:16: warning: unused variable 'ei' [-Wunused-variable]
   10 |         int ci,ei;
      |                ^~