I really like this problem, but I'm confused by one of the test cases. It asserts that num_count(2,2) is 90. If I'm reading that correctly, that means the number of two digit numbers without two successive zeros should be 90. But I can only think of one two digit number with two successive zeros: 00. Am I misinterpreting something?
num_count(2,2) == [10 : 99]
so total 2 digit numbers 'without' 2 successive zeros = 90 [since from 10 to 99, none of them contains 2 successive zeros].
now, '00' is not considered as a two digit number. similarly '023' is not considered as a 3 digit number.
I've considered the integer sequence here.
Am I wrong or is the problem actually requesting at least d-number of sucessive zeros? Having exactly d-number of sucessive zeros, and having at least d-number of sucessive zeros are two different cases. And the problem should specify which is the case required.
Stuff the Board
Number of Even Elements in Fibonacci Sequence
generate nth pentatope number
check whether a number is a pentatope number
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