/tmp/cclVtoID.o: In function `Report(int)':
tutorial3.cpp:(.text+0x0): multiple definition of `Report(int)'
/tmp/ccMzBiwS.o:grader.cpp:(.text+0x0): first defined here
/tmp/cclVtoID.o:(.bss+0x0): multiple definition of `result_n'
/tmp/ccMzBiwS.o:(.bss+0x0): first defined here
/tmp/cclVtoID.o: In function `main':
tutorial3.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccMzBiwS.o:grader.cpp:(.text.startup+0x0): first defined here
/tmp/ccMzBiwS.o: In function `main':
grader.cpp:(.text.startup+0xa3): undefined reference to `sort_even(int, int*)'
/tmp/cclVtoID.o: In function `main':
tutorial3.cpp:(.text.startup+0x73): undefined reference to `sort_even(int, int*)'
collect2: error: ld returned 1 exit status