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.

Example:

Input: "Hello World"
Output: 5

既然是找最后一个单词的从字符串的结尾开始寻找。

class Solution {
public:
    int lengthOfLastWord(string s) {
        if(s.length() == 0)
            return 0;
        int cnt = 0;
        int leg = s.length();
        int i = leg-1;
        
        while(s[i]==' '){
            i--;
        }
        while(i>=0){
            if(s[i]!=' '){
                cnt++;
                i--;
            }else
                break;
                
        }
        return cnt;
    }
};