43. Multiply Strings

1. 问题描述

Given two numbers represented as strings, return multiplication of the numbers as a string.
Note:
The numbers can be arbitrarily large and are non-negative.
Converting the input string to integer is NOT allowed.
You should NOT use internal library such as BigInteger.
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Tags: Math String
Similar Problems: (M) Add Two Numbers (E) Plus One (E) Add Binary

2. 解答思路
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4. 反思