Leetcode 43 String multiplication (2022.02.12)

  Given two non negative integers in the form of strings num1 and num2, return num1 and num2 The product of the , Their product is also represented as a string .

Be careful ： You cannot use any built-in BigInteger Library or directly convert the input to an integer .

Example 1:

Input : num1 = “2”, num2 = “3”
Output : “6”

Example 2:

Input : num1 = “123”, num2 = “456”
Output : “56088”

Tips ：

1 <= num1.length, num2.length <= 200
num1 and num2 It can only consist of numbers .
num1 and num2 It doesn't contain any leading zeros , In addition to digital 0 In itself .

source ： Power button （LeetCode）
link ：https://leetcode-cn.com/problems/multiply-strings

Method 1 ： Call the type conversion function

Python3 Submission ：

class Solution:
    def multiply(self, num1: str, num2: str) -> str:
        return str(int(num1) * int(num2))