The length of the last word in leetcode

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This article mainly records leetcode The length of the last word

subject

 Given a space that contains only uppercase and lowercase letters  ' '  String  s, Returns the length of its last word . If the string scrolls from left to right , So the last word is the last word .

 If there is no last word , Please return  0 .

 explain ： A word is made up of only letters 、 Without any space characters   Maximum substring .

 

 Example :

 Input : "Hello World"
 Output : 5

 source ： Power button （LeetCode）
 link ：https://leetcode-cn.com/problems/length-of-last-word
 Copyright belongs to the network . For commercial reprint, please contact the official authority , Non-commercial reprint please indicate the source .

Answer key

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

Summary

Here we traverse the string array from back to front , Cumulative length of non space encountered , In case of space, judge whether the result is 0, Not for 0 Returns the result .

doc

• Length of last word