/usr/bin/ld: /tmp/ccWIftkA.o: in function `main': grader.cpp:(.text.startup+0x3bd): undefined reference to `init(int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)' /usr/bin/ld: grader.cpp:(.text.startup+0x440): undefined reference to `simulate(int, int)' collect2: error: ld returned 1 exit status
