LC58 Length of Last Word

solution1

class Solution:
    # time O(N) space O(N) 
    def lengthOfLastWord(self, s: str) -> int:
        l = 0
        r = len(s)-1
        # get the right space 
        while r>=0 and s[r] == ' ':
            r -= 1
        # count the last word (devided by space) by increamenting l
        while r>= 0 and s[r] != ' ':
            l += 1
            r -= 1
        return l 

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f11e408483b696119d803ad8c6b1f8ec5efa0e1a solution2

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        # case1 : check if empty  
        strip = s.strip()
        if strip == '':
            return 0
        # case2: check "a  "  will return several "" entry in the list 
        l = s.split(' ')
        while len(l[-1])==0:
            l.pop()
        return len(l[-1]) 
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test 1st ======= ``` f11e408483b696119d803ad8c6b1f8ec5efa0e1a