molecules.cpp: In function 'std::vector<long int> find_subset(long int, long int, std::vector<long long int>)':
molecules.cpp:9:19: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
9 | for(long i=0;i<w.size();i++){
| ~^~~~~~~~~
molecules.cpp:16:19: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
16 | for(long i=0;i<w.size();i++){
| ~^~~~~~~~~
molecules.cpp:31:21: warning: comparison of integer expressions of different signedness: 'long int' and 'std::vector<std::pair<long long int, long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
31 | for(long i=now;i<v.size();i++){
| ~^~~~~~~~~
/tmp/ccU68WMr.o: In function `main':
grader.cpp:(.text.startup+0x12b): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status