Compute IO time only for read/write operation, exclude open/close file
Merge branch 'master' of github.com:howardxu/odd_even
Merge branch 'master' of github.com:howardxu/odd_even
Merge branch 'master' of github.com:howardxu/odd_even
Merge branch 'master' of github.com:howardxu/odd_even

Conflicts:
	advanced/HW1_101061536_advanced.cpp