Excluding spaces and hyphens, how many letters are there in a given number between 1 and 1000 (inclusive)? How can I make my algorithm more efficient?
dig_lens = [4,3,3,5,4,4,3,5,5,4]
tens_lens = [0,3,6,6,6,5,5,7,6,6]
teens_lens = [0,6,6,8,8,7,7,9,8,8]
def num_letters(n):
nlist = []...