Easy

Quiz

#415 Add Strings

APPROACH

You are given two non-negative integers as strings num1 and num2. Add them together and return the result as a string. You may not cast either string to an integer type directly, nor use any big-integer library.

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"

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What is the optimal approach for this problem?