1def encode(strs):2    encoded = ""34    for s in strs:5        encoded += f"{len(s)}:{s}"67    return encoded89def decode(s):10    res = []11    i = 01213    while i < len(s):14        j = i15        while s[j] != ":":16            j += 117        length = int(s[i:j])18        i = j + 119        j = i + length20        res.append(s[i:j])21        i = j2223    return res