15算法课程 58. Length of Last Word

获取字符串最后一个单词长度

原创于 2017-10-05 20:37:15 发布 · 292 阅读

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#算法

本文介绍了一种通过C++实现的方法来找到一个给定字符串中最后一个单词的长度。该方法首先去除字符串末尾的空白字符，然后计算从最后一个空格到字符串末尾的字符数作为单词长度。

Given a string s consists of upper/lower-case alphabets and empty space characters' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example,
Given s = "Hello World",
return 5.

solution:

注意末尾空格

code:

class Solution {
public:
    int lengthOfLastWord(string s) {
        while(s[s.size()-1] == ' ') s.erase(s.size()-1);
        return s.size() - s.rfind(' ') -1;
    }
};