[LeetCode] Length of Last Word

最新推荐文章于 2025-08-14 09:56:16 发布

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最新推荐文章于 2025-08-14 09:56:16 发布

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文章标签：开发工具

原文链接：http://www.cnblogs.com/jcliBlogger/p/4605703.html

本文介绍了一种使用C++来确定给定字符串中最后一个单词长度的方法。该方法从字符串末尾开始向前查找，跳过所有空格，并计算最后一个非空格单词的字符数。

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Well, the basic idea is very simple. Start from the tail of s and move backwards to find the first non-space character. Then from this character, move backwards and count the number of non-space characters until we pass over the head of s or meet a space character. The count will then be the length of the last word.

 1 class Solution {
 2 public:
 3     int lengthOfLastWord(string s) { 
 4         int len = 0, tail = s.length() - 1;
 5         while (tail >= 0 && s[tail] == ' ') tail--;
 6         while (tail >= 0 && s[tail] != ' ') {
 7             len++;
 8             tail--;
 9         }
10         return len;
11     }
12 };