foo.cc: In function ‘void solve_1139(std::vector<std::vector<int> >&)’:
foo.cc:97:18: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   97 |     for(int i=0;i<min_path.size();i++) {
      |                 ~^~~~~~~~~~~~~~~~