<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022255536/1793a61a-ddd6-4454-a710-5593c9e2c996.png" alt class="image--center mx-auto" /></p>
<h2 id="heading-recursion"><strong>Recursion</strong></h2>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022360536/8fd23a3b-dbe3-4353-a780-bf0ab30d517f.png" alt class="image--center mx-auto" /></p>
<h3 id="heading-two-pointer-first-and-last-element-swap"><strong>Two Pointer</strong>: First and Last Element, Swap</h3>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022219455/6feec73d-9c6a-45a8-85ad-5ba09502b82f.png" alt class="image--center mx-auto" /></p>
<h2 id="heading-stack">Stack</h2>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022527212/d55f52a2-edc4-4a3d-9603-270e8a55cb82.png" alt class="image--center mx-auto" /></p>
<h2 id="heading-java-stringbuilder-built-in-function">Java StringBuilder Built In Function</h2>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022226878/119f683c-797e-43b1-8e58-083635b46e49.png" alt class="image--center mx-auto" /></p>
<h2 id="heading-javascript-built-in-functions">JavaScript Built In Functions</h2>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022235014/116b04e9-1c6b-465d-ab52-bbb2bb08701c.png" alt class="image--center mx-auto" /></p>
<h2 id="heading-python-built-in-function">Python Built In Function</h2>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1709022239352/f04148a6-d9b8-49f2-b87d-9044e004fbe4.png" alt class="image--center mx-auto" /></p>


![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022255536/1793a61a-ddd6-4454-a710-5593c9e2c996.png align="center")

## **Recursion**

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022360536/8fd23a3b-dbe3-4353-a780-bf0ab30d517f.png align="center")

### **Two Pointer**: First and Last Element, Swap

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022219455/6feec73d-9c6a-45a8-85ad-5ba09502b82f.png align="center")

## Stack

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022527212/d55f52a2-edc4-4a3d-9603-270e8a55cb82.png align="center")

## Java StringBuilder Built In Function

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022226878/119f683c-797e-43b1-8e58-083635b46e49.png align="center")

## JavaScript Built In Functions

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022235014/116b04e9-1c6b-465d-ab52-bbb2bb08701c.png align="center")

## Python Built In Function

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1709022239352/f04148a6-d9b8-49f2-b87d-9044e004fbe4.png align="center")

Using
- Two Pointer
- Recursion
- Stack
- Built In Function

DSA PROBLEM: Reverse String

Problem: Reverse String

Recursion

Problem: Reverse String

Table of contents

Recursion

Two Pointer: First and Last Element, Swap

Stack

Java StringBuilder Built In Function

JavaScript Built In Functions

Python Built In Function