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.

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class Solution {public:    int lengthOfLastWord(string s) {      istringstream s1(string(s.rbegin(),s.rend()));      return s1>>s?s.size():0;    }};