58. Length of Last Word

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

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.

빈값으로 split해서 a에 담는다.
그 다음 빈값이 아닌 것들만 골라서 ans에 담는다.
왜냐면 Example 3와 같이 빈값이 있으면 오답이 나오기 때문이다.
그리고 ans의 마지막 요소의 길이를 리턴하면 끝!

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        a = s.split(" ")
        ans = [item for item in a if item != '']
        return len(ans[-1])