molecules.cpp: In function 'int main()':
molecules.cpp:15:8: warning: unused variable 'd' [-Wunused-variable]
15 | ll d=0;
| ^
/usr/bin/ld: /tmp/ccRIq0oR.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccDNFDGP.o:molecules.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccRIq0oR.o: in function `main':
grader.cpp:(.text.startup+0x18d): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status