/usr/bin/ld: /tmp/cc5vXzke.o: in function `query()':
grader.cpp:(.text+0x440): multiple definition of `query()'; /tmp/ccOFut1e.o:Xoractive.cpp:(.text+0x610): first defined here
/usr/bin/ld: /tmp/cc5vXzke.o: in function `ask(int)':
grader.cpp:(.text+0x470): multiple definition of `ask(int)'; /tmp/ccOFut1e.o:Xoractive.cpp:(.text+0x640): first defined here
/usr/bin/ld: /tmp/cc5vXzke.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccOFut1e.o:Xoractive.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc5vXzke.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/ccOFut1e.o:Xoractive.cpp:(.text+0x6a0): first defined here
collect2: error: ld returned 1 exit status