Length of Last Word

Total Accepted: 74498 Total Submissions: 265241 Difficulty: Easy

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.

大清早，先水一题

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

 

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