LeetCode 58 Length of Last Word
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题目:
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
.
题意:
给一个字符串,由字母和空格组成,问最后一个单词的长度,一个字母也可为一个单词。
从后向前找第一个字母,之后再找到连续字母的长度,即为所要求的长度。
代码如下;
class Solution {public: int lengthOfLastWord(string s) { int cur = s.length() - 1; while (cur >= 0 && !isalpha(s[cur])) { cur --; } int len = 0; while (cur - len >= 0 && isalpha(s[cur - len])) { len ++; } return len; }};
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