[LeetCode] 58. Length of Last Word

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.

class Solution {public:    int lengthOfLastWord(string s) {        while (!s.empty() && s.back() == ' ') s.pop_back();        int i = (int)s.size() - 1;        while (i >= 0 && s[i] != ' ') i--;        return (int)s.size() - i - 1;    }};