/usr/bin/ld: /tmp/ccE5kJTV.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccwdcYkU.o:answer.code:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccE5kJTV.o: in function `main':
grader.cpp:(.text.startup+0x744): undefined reference to `process(std::vector<std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::allocator<std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >, int, int, int, int)'
collect2: error: ld returned 1 exit status