58. Length of last word

January 13, 2024

https://leetcode.com/problems/length-of-last-word/description/

Given a string s consisting of words and spaces, return the length of the last word in the string. A word is a maximal substring

consisting of non-space characters only.

Example 1: Input: s = “Hello World” Output: 5 Explanation: The last word is “World” with length 5. Example 2: Input: s = " fly me to the moon " Output: 4 Explanation: The last word is “moon” with length 4. Example 3: Input: s = “luffy is still joyboy” Output: 6 Explanation: The last word is “joyboy” with length 6.

Constraints:

1 <= s.length <= 104 	
s consists of only English letters and spaces ' '. 	
There will be at least one word in s.

code

class Solution {
    public int lengthOfLastWord(String s) {
        s = s.trim();  // trim the trailing spaces in the string
        return s.length() - s.lastIndexOf(" ") - 1;
    }
}

code

class Solution {
    public int lengthOfLastWord(String s) {
        int p = s.length() - 1;
        int res = 0;
        while (p >= 0){
            if (s.charAt(p) != ' '){
                res++;
            }else if (res > 0){
                return res;
            }
            p--;
        }
        return res;
    }
}

code

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        return len(s.split()[-1])

code

class Solution {
    public int lengthOfLastWord(String s) {
        String[] l = s.split(" ");
        return l[l.length - 1].length();
    }
}