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Multiply Strings Leetcode Solution

In this tutorial, we are going to solve a leetcode problem Add Two Numbers in Python.

Task:

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

Note: You must not use any built-in BigInteger library or convert the inputs to integer directly.

Example 1:

Input: num1 = "2", num2 = "3"
Output: "6"

Example 2:

Input: num1 = "123", num2 = "456"
Output: "56088"

Constraints:

  • 1 <= num1.length, num2.length <= 200
  • num1 and num2 consist of digits only.
  • Both num1 and num2 do not contain any leading zero, except the number 0 itself. 

Solution:

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

Steps:

step1: As we are solving this problem in python so we'll be going to use some advantages of using python i.e. built-in functions

step2: we simply write the return statement and inside it we use the typecasting which will convert the integer multiplication into a string.