LeetCode - 58. Length of Last Word

58. Length of Last Word

class Solution(object):
    def lengthOfLastWord(self, s):
        """
        :type s: str
        :rtype: int
        """
        arr = s.split(" ")
        res = 0
        for ch in arr:
            if len(ch):
                res = len(ch)
        return res

class Solution(object):
    def lengthOfLastWord(self, s):
        """
        :type s: str
        :rtype: int
        """
        length = 0
        res = 0
        s += " "
        for ch in s:
            if ch==" ":
                if length != 0:
                    res = length
                length = 0
            else:
                length += 1
        return res

class Solution(object):
    def lengthOfLastWord(self, s):
        """
        :type s: str
        :rtype: int
        """
        n = len(s)-1
        res = 0
        while(n>=0 and s[n]==" "): n -= 1
        while(n>=0 and s[n]!=" "):
            n -= 1
            res += 1
        return res