Practice Add Strings
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
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.
Source: Add Strings on LeetCode. Use the original task for its coding environment and submissions.
Examples
# 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 <= 10^4
num1 and num2 consist of only digits.
num1 and num2 don't have any leading zeros except for the zero itself.
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