# [58. Length of Last Word](https://leetcode-cn.com/problems/length-of-last-word/)

## 题目

Given a string s consisting of some words separated by some number of spaces, return the length of the last word in the string.

A word is a maximal substring consisting of non-space characters only.

Example 1:

```
Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.
```

Example 2:

```
Input: s = "   fly me   to   the moon  "
Output: 4
Explanation: The last word is "moon" with length 4.
```

Example 3:

```
Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.
```

## 题目大意

给你一个字符串 s，由若干单词组成，单词前后用一些空格字符隔开。返回字符串中最后一个单词的长度。

单词 是指仅由字母组成、不包含任何空格字符的最大子字符串。

## 解题思路

- 先从后过滤掉空格找到单词尾部，再从尾部向前遍历，找到单词头部，最后两者相减，即为单词的长度