# Add Binary Strings InterviewBit Solution

**Problem:** __Add Binary Strings __

**Problem Description:**

Given two binary strings, return their sum (also a binary string).

**Example:**

```
a = "100" -> 4 in decimal
b = "11" -> 3 in decimal
Return a + b =
```**“****111****”** -> 7 in decimal

## Solution Approach:

How will you add two binary numbers on paper? Just try implementing that approach.

## Time Complexity:

O(N), where N is the size of input string.