1

Implement Stack using Arrays

2

Implement Queue using Arrays

3

Implement Stack using Queue

4

Implement Queue using Stack

5

Implement stack using Linkedlist

6

Implement queue using Linkedlist

7

Check for balanced paranthesis

8

Implement Min Stack

1

Infix to Postfix Conversion using Stack

2

Prefix to Infix Conversion

3

Prefix to Postfix Conversion

4

Postfix to Prefix Conversion

5

Postfix to Infix

6

Convert Infix To Prefix Notation

1

Next Greater Element

2

Next Greater Element 2

3

Next Smaller Element

4

Number of NGEs to the right

5

Trapping Rainwater

6

Sum of subarray minimum

8

Asteroid Collision

9

Sum of subarray ranges

10

Remove k Digits

11

Largest rectangle in a histogram

12

Maximal Rectangles

1

Sliding Window maximum

2

Stock span problem

3

The Celebrity Problem

5

LRU cache (IMPORTANT)

6

LFU cache