leetcode989

class Solution:
    def addToArrayForm(self, A, K):
        i = len(A) - 1
        while i >= 0 and K > 0:
            A[i] += K
            K = A[i] // 10
            if A[i] >= 10:
                A[i] %= 10
                if i == 0:
                    A = [0] + A
                    i += 1
            i -= 1
        return A
        

 上面这个是参考别人的解决方案，思路不好理解，我又从新写了一个啰嗦的：

class Solution:
    def addToArrayForm(self, A: 'List[int]', K: 'int') -> 'List[int]':
        lenA = len(A)
        KS = str(K)
        lenB = len(KS)
        B = list()
        maxlen = 0
        if lenA > lenB:
            maxlen = lenA
            dis = lenA - lenB
            for i in range(dis):
                B.append(0)
        elif lenA < lenB:
            maxlen = lenB
            dis = lenB - lenA
            for i in range(dis):
                A.insert(0,0)
        else:
            maxlen = lenA
            
        for i in range(lenB):
            B.append(int(KS[i]))

        I = 0
        R = list()
        maxpotion = maxlen - 1
        while maxpotion >= 0:
            C = A[maxpotion] + B[maxpotion] + I
            if C >= 10:
                I = 1
                C = C % 10
            else:
                I = 0
            R.insert(0,C)
            maxpotion -= 1

        if I == 1:
            R.insert(0,1)
        return R