/usr/bin/ld: /tmp/cco7f6cP.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccr2ktoO.o:koala.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cco7f6cP.o: in function `runGame(int)':
grader.cpp:(.text+0x157): undefined reference to `minValue(int, int)'
/usr/bin/ld: grader.cpp:(.text+0x191): undefined reference to `allValues(int, int, int*)'
/usr/bin/ld: grader.cpp:(.text+0x1d7): undefined reference to `maxValue(int, int)'
collect2: error: ld returned 1 exit status