/usr/bin/ld: /tmp/ccqht1iX.o: in function `main':
grader_encoder.cpp:(.text.startup+0xd1): undefined reference to `Encode(int, int*, int*)'
collect2: error: ld returned 1 exit status
/usr/bin/ld: /tmp/ccTBqjIK.o: in function `main':
grader_device.cpp:(.text.startup+0xf8): undefined reference to `InitDevice()'
/usr/bin/ld: grader_device.cpp:(.text.startup+0x19b): undefined reference to `Answer(long long, long long)'
collect2: error: ld returned 1 exit status