*(leetcode_string) Length of Last Word

Length of Last Word

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Question Solution 

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(const char *s) {        int j = strlen(s)-1;        int count=0;        while(j>=0&&s[j]==' ')            j--;        while(j>=0&&s[j--]!=' ')            count++;        return count;    }};