problem0043

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43. Multiply Strings

题目

Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2.

Note:

1. The length of both num1 and num2 is < 110.
2. Both num1 and num2 contains only digits 0-9.
3. Both num1 and num2 does not contain any leading zero.
4. You must not use any built-in BigInteger library or convert the inputs to integer directly.

解题思路

1. 利用[]int{}记录中间计算过程，此时不考虑进位，例如，"123" 和 "65" 的记录为 []int{6,17,28,15}
2. 统一处理进位，记录变为[]int{7,9,9,5}
3. 转换为string，返回

细节见程序注释。

总结