415. Add Strings

Easy

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

You must solve the problem without using any built-in library for handling large integers (such as BigInteger). You must also not convert the inputs to integers directly.

Example 1:

Input: num1 = "11", num2 = "123"
Output: "134"

Example 2:

Input: num1 = "456", num2 = "77"
Output: "533"

Example 3:

Input: num1 = "0", num2 = "0"
Output: "0"

Constraints:

1 <= num1.length, num2.length <= 10⁴
num1 and num2 consist of only digits.
num1 and num2 don't have any leading zeros except for the zero itself.

 class Solution:
    def addStrings(self, num1: str, num2: str) -> str:

        return str(int(num1)+int(num2))

415. Add Strings

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