DS Algorithm

 Data Structures & Algorithms (DSA)

DSA means Data Structures and Algorithms.

It is used to store data efficiently and solve problems step-by-step in programming.

Think like this:

🗂️ Data Structure → How you store data

🧠 Algorithm → How you solve the problem

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🔹 What is a Data Structure?

A way to organize data so it can be used easily.

Types of Data Structures

1️⃣ Linear Data Structures

Data stored in a sequence.

Array

Linked List

Stack

Queue

2️⃣ Non-Linear Data Structures

Data stored in hierarchical form.

Tree

Graph

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🔹 Important Data Structures

📌 Array

Stores elements in continuous memory. Example:

[10, 20, 30, 40]

📌 Stack (LIFO)

Last In First Out

Example: Plates stack 🍽️

Push → Add

Pop → Remove

📌 Queue (FIFO)

First In First Out

Example: Line at billing counter 🧾

📌 Linked List

Elements connected using pointers.

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🔹 What is an Algorithm?

An algorithm is a step-by-step method to solve a problem.

Example: Find largest number in array

Steps:

1. Assume first number is largest

2. Compare with next numbers

3. Update largest

4. Print result

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🔹 Important Algorithms

🔹 Searching

Linear Search

Binary Search

🔹 Sorting

Bubble Sort

Selection Sort

Insertion Sort

Merge Sort

Quick Sort

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🔹 Why DSA is Important?

Helps in placements 💼

Improves problem solving

Used in companies like Google, Amazon, etc.

Makes code faster and efficient