```
public class Solution
extends Object
```
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.

public String addStrings(String num1,
                         String num2)

Class Solution