molecules.cpp: In function 'long long int* find_subset(long long int, long long int, std::vector<long long int>)':
molecules.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(ll i = 0;i < w.size();i++){
~~^~~~~~~~~~
molecules.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(ll j = i;j < w.size();j++){
~~^~~~~~~~~~
molecules.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(j == w.size()-1){
~~^~~~~~~~~~~~~
/tmp/ccYJdqMm.o: In function `main':
grader.cpp:(.text.startup+0x152): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status