## Search an element in a Doubly Linked List

Introduction Learn the most efficient way to search an element in a doubly linked list. The linked list is one of the most important concepts and data structures to learn...

## Find a Number

Concepts Used Binary Search Difficulty Level Easy Problem Statement : Finding a number has always been an interesting puzzle! Well in this problem we are given a sorted array of...

## Play With Brackets

Concepts Used Stack Difficulty Level Easy. Problem Statement : Rashid is given a set of open and closed brackets of each type such as [ , ], ( , )...

## Parallelograming(paid)

CONCEPTS USED: Computational Geometry DIFFICULTY LEVEL: Medium. PROBLEM STATEMENT(SIMPLIFIED): Alex likes parallelograms very much. So one day his sister Alice gave him n numbers and asked him to calculate the...

## Nearest Cell(paid)

CONCEPTS USED: Recursion DIFFICULTY LEVEL: Easy PROBLEM STATEMENT (SIMPLIFIED): Rahul is stuck in a maze world, where the maze is a binary matrix of size NXM (each cell has value...

## Beautiful Bracket String (Paid Article and Add Time Complexity)

Concepts Used: Stack Difficulty Level: Medium. Problem Statement : Find the minimum number of replacements required to make the given string of braces balanced. See original problem statement here Example:...

## Files

Concepts Used Basic operations of stack. Difficulty Level: Hard. Problem Statement : Nikhil now got a job. His task is to evaluate files. His boss comes and puts a file...

## Kth Smallest Number

Concepts Used Heap Difficulty Level Easy Problem Statement : Given an array arr[ ] and a number K where K is smaller than the size of the array, the task...

## Aman and Shopping

Concepts Used Sorting Difficulty Level Easy Problem Statement (Simplified): For a given array A, find the total number of elements you can pick in given capacity X. You can't pick...
Rambo Numbers Concepts Used Mathematics Difficulty Level Hard Problem Statement (Simplified): For given three numbers r,p,q. We have to find the total number of values divisible by r in a...