LeetCode ❀ 58. Length of last word/ python split() function

topic:

You are given a string s, which consists of several words separated by some space characters before and after the words. Returns the length of the last word in a string.

A word is the largest substring that consists only of letters and does not contain any space characters.

Example 1:

输入：s = "Hello World"
输出：5
解释：最后一个单词是“World”，长度为5。

Example 2:

输入：s = "   fly me   to   the moon  "
输出：4
解释：最后一个单词是“moon”，长度为4。

Example 3:

输入：s = "luffy is still joyboy"
输出：6
解释：最后一个单词是长度为6的“joyboy”。

answer:

As can be seen from Example 2, there may be spaces at the end of the string.

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        i, count = len(s) - 1, 0
        while i >= 0 and s[i] == ' ':
            i -= 1
        while i >= 0:
            if s[i] == ' ':return count
            count += 1
            i -= 1
        return count

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        return len(s.split()[-1])

 # 还有一种方法就是使用 split() 函数
 # split() 通过指定分隔符对字符串进行切片，如果第二个参数 num 有指定值，则分割为 num+1 个子字符串。
 # split("x", 2)则表示以x为分隔符，将字符串分成3个，从前往后分割依次
 # 在此题中，分割完再以[-1]取最后一个字符串再计算长度