[LeetCode 415] Add Strings

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

Note:

• 1. The length of both num1 and num2 is < 5100.
• 1. Both num1 and num2 contains only digits 0-9.
• 1. Both num1 and num2 does not contain any leading zero.
• 1. You must not use any built-in BigInteger library or convert the inputs to integer directly.

Diffculty
Easy

Similar Problems
[LeetCode 2] Add Two Numbers Medium [LeetCode 43] Multiply Strings Medium

Analysis