leetcode 58. Length of Last Word

Seawolf

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

class Solution {
    public int lengthOfLastWord(String s) {
        
        s = s.replaceAll(" +"," ");
        
        if(s.equals(" ")){
            
            return 0;
        }
        
        String[] result = s.split(" ");
        
        return result[result.length-1].length();
        
    }
}

利用split方法，效率有点低，继续改进。

class Solution {
    public int lengthOfLastWord(String s) {
        
        s = s.trim();
        
        return s.length() - (s.lastIndexOf(" ") +1) ;
    }
}