/usr/bin/ld: /tmp/cc2KUm5f.o: in function `query()':
grader.cpp:(.text+0x440): multiple definition of `query()'; /tmp/ccLtHKde.o:Xoractive.cpp:(.text+0x440): first defined here
/usr/bin/ld: /tmp/cc2KUm5f.o: in function `ask(int)':
grader.cpp:(.text+0x470): multiple definition of `ask(int)'; /tmp/ccLtHKde.o:Xoractive.cpp:(.text+0x470): first defined here
/usr/bin/ld: /tmp/cc2KUm5f.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccLtHKde.o:Xoractive.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc2KUm5f.o: in function `get_pairwise_xor(std::vector<int, std::allocator<int> >)':
grader.cpp:(.text+0x4d0): multiple definition of `get_pairwise_xor(std::vector<int, std::allocator<int> >)'; /tmp/ccLtHKde.o:Xoractive.cpp:(.text+0x5e0): first defined here
collect2: error: ld returned 1 exit status