394 字符串解码class Solution: def decodeString(self, s: str) - str: stack[] res k0 for c in s: if c.isalpha():resc if c.isdigit():k10*kint(c) if c[: stack.append((res,k)) k0 res if c]: sub_resres res,kstack.pop() resresk*sub_res k0 return res