Leetcode #58. Length of Last Word 末尾词长 解题报告

1 解题思想

这道题就是找到最后一个词的长度，每个次之间就是用空格分隔。。

所以我们就找到最后一个空格，然后计数就可以了

2 原题

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.

3 AC解

public class Solution {
    public int lengthOfLastWord(String s) {
        char[] chars=s.toCharArray();
        int i=s.length()-1;
        int count=0;
        while(i>=0 && chars[i]==' '){
            i--;
        }
        while(i>=0 && chars[i--]!=' '){
         count++;
        }
        return count;

    }
}