AVL Trees | Self-Balancing Trees | Everything You need To know
02 October 2021
AVL trees named after three inventors Adelson-Velsky-and Landis, is a type of self balancing binary search tree.
Balanced Trees & Introduction to Self Balancing Trees | Trees | Data Structures Simplified
28 September 2021
A balanced binary tree or a height-balanced tree is a tree in which the height of the left and right subtree at any node does not differ by more than one. Not just the root node, at any node. Mathematically...
Trie - Data Structure | Strings | Everything you need to know
21 September 2021
Trie, also known as prefix tree or digital tree, is an advanced tree data structure that makes data retrieval operations more efficient.
Adding SSH Keys for Multiple GitHub Accounts on the Same System | Complete Guide
29 June 2021
If you have different personal and work GitHub accounts and are trying to use SSH-based authentication for both of them chances are you will face some errors. In this article, I will show you how to do...
Hidden Web | Everything You Need To Know | Dark Web | TOR
18 May 2021
We live in an age when we are surrounded by technology and ads and tons of internet content. But even in this age there exist a part of the internet, a part of the society rather, that remains hidden from...
Everything you need to know about Server | Cloud | Data Center
02 April 2021
A server is just a computer. It is nothing different than the computer you use in terms of definition though it might differ in terms of the task it performs and the amount of power it has. A server is...
Finding a Cycle in a Linked List | Floyd's Tortoise and Hare Algorithm
22 March 2021
The Floyd's tortoise and hare algorithm is used to detect a cycle in a linked list. LL cycle can be found using a hash set but tortoise and hare algorithm is better in terms of space complexity.
Internet - How the Internet works | Ultimate guide | Everything you need
19 March 2021
You have an internet connection. But what is an “internet connection” anyway? What is mobile data? What are WiFi, LAN, DNS, IP address, ISP, and lots of other jargon that you use or just ignore when you...
What is a captcha? | reCAPTCHA | Why do websites ask [I am not a robot]
16 March 2021
What is a captcha? Why do websites use them? What do websites ask me if I am a robot?CAPTCHA is a type of challenge-response test used....
Multitasking | Operating system
12 March 2021
Multitasking, in an operating system, is allowing a user to perform more than one task at a time. Multitasking is achieved by the CPU by switching between the tasks so fast that appear to be running simultaneously.
Maximum Frequency Stack | February Leetcoding Challenge 2021 | Day 28
28 February 2021
implement FreqStack, a class which simulates the operation of a stack-like data structure.FreqStack has two functions:push(int x), which pushes an integer x onto the stack.pop(), which removes and returns...
Divide Two Integers | February Leetcoding challenge 2021 | Day 27
27 February 2021
Given two integers dividend and divisor, divide two integers without using multiplication, division, and mod operator. Return the quotient after dividing dividend by divisor. The integer division should...
Validate Stack Sequences | February Leetcoding challenge 2021 | Day 26
26 February 2021
Given two sequences pushed and popped with distinct values, return true if and only if this could have been the result of a sequence of push and pop operations on an initially empty stack.
Shortest Unsorted Continuous Subarray | February Leetcoding Challenge 2021 | Day 25
25 February 2021
Given an integer array nums, you need to find one continuous subarray that if you only sort this subarray in ascending order, then the whole array will be sorted in ascending order. Return the shortest...
Score of Parentheses | February Leetcoding Challenge 2021 | Day 24
25 February 2021
Given a balanced parentheses string S, compute the score of the string based on the following rule: () has score 1 AB has score A + B, where A and B are balanced parentheses strings. (A) has score 2 *...
Search a 2D Matrix II | February Leetcoding challenge 2021 | Day 23
23 February 2021
Write an efficient algorithm that searches for a target value in an m x n integer matrix. The matrix has the following properties: Integers in each row are sorted in ascending from left to right. Integers...
Longest Word in Dictionary through Deleting | February Leetcoding Challenge 2021 | Day 22
22 February 2021
Given a string and a string dictionary, find the longest string in the dictionary that can be formed by deleting some characters of the given string. If there are more than one possible results, return...
Broken Calculator | February Leetcoding Challenge 2021 | Day 21
21 February 2021
On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number on the display by 2, or; Decrement: Subtract 1 from the number on the display. Initially,...
Roman To Integer | February LeetCoding Challenge 2021 | Day20
20 February 2021
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.Given a roman numeral, convert it to an integer.
Minimum Remove to Make Valid Parentheses | February Leetcoding challenge 2021 | Day 19
19 February 2021
Given a string s of '(' , ')' and lowercase English characters. Your task is to remove the minimum number of parentheses ( '(' or ')', in any positions ) so that the resulting parentheses string is valid...
Arithmetic Slices | February Leetcoding Challenge 2021 | Day 18
18 February 2021
A zero-indexed array A consisting of N numbers is given. A slice of that array is any pair of integers (P, Q) such that 0
Container with most water | February LeetCoding Challenge 2021 | Day 17
17 February 2021
Given n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of the line i is at (i, ai) and (i, 0). Find...
Letter Case Permutation | February Leetcoding challenge 2021 | Day 16
16 February 2021
Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string.
The K Weakest Rows in a Matrix | February Leetcoding challenge 2021 | Day 15
15 February 2021
Given a m * n matrix mat of ones (representing soldiers) and zeros (representing civilians), return the indexes of the k weakest rows in the matrix ordered from the weakest to the strongest.
Is Graph Bipartite? | February Leetcoding Challenge 2021 | Day 14
14 February 2021
There is an undirected graph with n nodes, where each node is numbered between 0 and n - 1. You are given a 2D array graph, where graph[u] is an array of nodes that node u is adjacent to. More formally,...
Shortest Path in Binary Matrix | February Leetcoding Challenge 2021 | Day 13
13 February 2021
In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-right has length k if and only if it is composed of cells C_1, C_2, ..., C_k such that:...
Number of Steps to Reduce a Number to Zero | February Leetcoding Challenge 2021 | Day 12
12 February 2021
Given a non-negative integer num, return the number of steps to reduce it to zero. If the current number is even, you have to divide it by 2, otherwise, you have to subtract 1 from it.
Valid Anagram | February Leetcoding Challenge 2021 | Day 11
11 February 2021
Given two strings s and t , write a function to determine if t is an anagram of s.
Copy List with Random Pointer | February Leetcoding challenge 2021 | Day 10
10 February 2021
A linked list of length n is given such that each node contains an additional random pointer, which could point to any node in the list, or null.Construct a deep copy of ...
Convert BST to Greater Tree | February Leetcoding Challenge 2021 | Day 9
09 February 2021
Given the root of a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus sum of all keys greater than the original key in BST.
Peeking Iterator | February LeetCoding Challenge 2021 | Day 8
08 February 2021
Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that supports the peek() operation -- it essentially peek() at the element that will be returned...
Shortest Distance to a Character | February challenge 2021 | Day 7
07 February 2021
Given a string s and a character c that occurs in s, return an array of integers answer where answer.length == s.length and answer[i] is the shortest distance from s[i] to the character c in s.
Binary Tree Right Side View | February Leetcoding Challenge 2021| Day 6
05 February 2021
Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom.
Simplify path | February LeetCode Challenge 2021 | Day 5
05 February 2021
Given a string path, which is an absolute path (starting with a slash '/') to a file or directory in a Unix-style file system, convert it to the simplified canonical path.
SQL with python - complete guide
21 January 2021
SQL WITH PYTHON - THE COMPLETE GUIDE | FOR UBUNTU USERS​
Genetic Algorithm-Everything You Need To Know
25 September 2020
You must have heard about Darwin’s theory of evolution and natural selection. Genetic Algorithms are basically an effort to imitate the same, artificially. A genetic algorithm is a randomized search that...
6 Important STL Functions Every Programmer Should Know.
06 September 2020
The C++ STL (Standard Template Library) is a powerful set of C++ template classes to provide general-purpose functions with templates that implement many popular and commonly used algorithms.
Computer Science Fundamentals Beginner Programmer Should Know Before Starting Programming
30 July 2020
8 computer science concepts a beginner programmer must know to bridge the gap between having absolutely no idea and being a beginner in coding.