题解 | #把数字翻译成字符串#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 解码
# @param nums string字符串 数字串
# @return int整型
#

class Solution:
    def solve(self , nums: str) -> int:
        # write code here
        if not nums or nums[0]=='0':
            return 0
        a = 1
        if len(nums)==1:
            return a
        b = 0
        if nums[1]!='0':
            b += 1
        if int(nums[:2])<27:
            b += 1
        for i in range(2,len(nums)):
            c = 0
            if nums[i]!='0':
                c += b
            if int(nums[i-1]+nums[i])<27 and int(nums[i-1]+nums[i])>9:
                c += a
            a,b = b,c
        return b