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Practice Coding Interview Problems

Try some of the most popular interview questions

Coin Change: Find number of ways of representing n cents

Dynamic Programming

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Designing a scalable URL Shortener like Tiny URL

System Design - Nlogn

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Reverse a linked list in Linear Time without using extra space

Linked List

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Insert, Search and Delete Operation in Binary Search Tree

Tree Data Structure

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Latest blog post at Nlogn

System Design Tutorial

SQL vs NoSQL Databases

A database is an organized collection of data, generally stored and accessed from a computer system. There are two major types of databases available: SQL and...
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Practice Programming

Count the number of islands

Given a binary 2D matrix, containing the combination of 1's and 0's, where 0's represents the water and 1's represent the land. Our...
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CPP

Call by value and call by reference in C++

There are two ways to pass arguments to a function in CPP: Call by Value or Call by Reference. The Call by Value...
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System Design Tutorial

What are Long Polling, WebSockets, and Server-Sent Events

Before understanding Long Polling, WebSockets, Server-Sent Events lets understand how the basic communication over the internet using HTTP request happens. HTTP is the...
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System Design Tutorial

Designing Instagram Architecture – System Design

The prerequisite for learning the Instagram architecture design is, how to design a URL Shortner Service like a tiny URL. Please read it...
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Practice Programming

Count all possible paths between two vertices of a directed graph

Given a directed graph G, and two vertices: start s & end e, count all possible way of reaching the vertex e from...
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