With countNumberUsage you gotta be careful and check for edge cases. Here you might also want to make sure that the total number usage is 2, as something like 5(10)2000 will also give you a right answer.
With countNumberUsage you gotta be careful and check for edge cases. Here you might also want to make sure that the total number usage is 2, as something like 5(10)2000 will also give you a right answer.