string-encode-and-decode

String Encode and Decode (on NeetCode):

string Encode and Decode MEDIUM
Solved 
Design an algorithm to encode a list of strings to a single string. The encoded string is then decoded back to the original list of strings.

Please implement encode and decode

Example 1:

Input: ["neet","code","love","you"]

Output:["neet","code","love","you"]
Example 2:

Input: ["we","say",":","yes"]

Output: ["we","say",":","yes"]
Constraints:

0 <= strs.length < 100
0 <= strs[i].length < 200
strs[i] contains only UTF-8 characters.



My Sol:

class Solution:
    def encode(self, strs: List[str]) -> str:
        res = ""
        for s in strs:
            res += str(len(s)) + '#' + s
        return res
    
    def decode(self, s: str) -> List[str]:
        res, i = [], 0
        while i < len(s):
            j = i
            while s[j] != "#":
                j += 1
            length = int(s[i:j])
            res.append(s[j+1 : j+1+length])
            i = j+1+length
        return res