ALGORITHMS (Click on the question to open)

ARTICLE

VIDEO

STL

STL Introduction

First Unique Character In A String

Kth Largest Element

One Integer

Maximum Score From Removing Stones

Find K Closest Elements

Distinct Candies

Bulls And Cows

Smallest Range Covering Elements From K Lists

HASHING

Hashing Introduction

Two Sum III - Data Structure Design

Find Subsequence of Length K With the Largest Sum

Find Longest Awesome Substring

Avoid Flood in The City

Count Good Meals

Ugly Number II

Word Ladder II

Word Break II

Jump Game IV

LFU Cache

BIT MANIPULATION

All about Bit Manipulation

Power Of Two

Power Of Four

Decode XORed Array

Count Bits

Sort Integers By The Number Of 1 Bits

Longest Consecutive Run Of 1s in Binary

Hamming Distance

Unique Number II

Unique Number III

Find Subsets

Maximum Score Words Formed By Letters

Triples with Bitwise AND Equal To Zero

Bitwise AND of Numbers Range

Total Hamming Distance

Travelling Salesman Problem

Decode XORed Permutation

Find the Shortest Superstring

LARGE NUMBERS

Big Integers Introduction

Big Addition

Big Multiplication

Big Factorials

Big Integer Challenge - Julka

RECURRENCE

Analysis of Algorithms (Solving Recurrences)

Matrix Exponentiation Introduction

Pow(x, n) - Binary Exponentiation

Maximize Number of Nice Divisors - Modular Binary Exponentiation

Open The Lock

Fibonacci Number - Fast Matrix Multiplication

Strange Function

N-th Tribonacci Number

PIGEONHOLE

Pigeonhole Principle Introduction

Maximum Gap

DIVSUB

Array With Elements Not Equal to Average of Neighbors

The Gray-Similar Code

HOLI - Holiday Accommodation

Subarray Sums Divisible by K

PROBABILITY

Probability Theory Introduction

Linearity Of Expectation

Expected Throws - One Head

Expected Throws - Two Consecutive Heads

Expected Throws - N Consecutive Heads

Bernoulli's Trial

Coupon Collector

Bob and Pallindromes

Second Player

INCLUSION-EXCLUSION

Inclusion-Exclusion Principle

Count Number of Divisors till N

Divisibility Rule

PRIME NUMBERS

Prime Sieve

Prime Queries

Prime Factorisation - O(N)

Prime Factorisation - O(√N)

Prime Factorisation - O(LogN)

Count Primes

Prime Arrangements - Segmented Sieve

Alice and Candies

Prime Sum

Closest Divisors

EUCLIDEAN

Greatest Common Divisor

Extended Euclidean Algorithm (Base + Extended)

Modular Multiplicative Inverse

Linear Diophantine Equation

Co-prime divisor of a Number

Nastya Studies Informatics

Row GCD

NUMBER THEORY

Modular Arithmetic

Fermat's Theorem

Count (N!) % P -------> (N factorial Modulo P)

Count (nCr) % P -------> (r Combinations of n Modulo P)

Check If Array Is Good

Remainder's Game

COMBINATORICS

Combinatorics Basics

Binomial Coefficients

Selection of Personnel

The World is a Theatre

Permutations & Combinations Formulas

Birthday Paradox

Catalan Numbers

The Skyline Problem

Count the Arrays

Beautiful Numbers

RECURSION

Basics Of Recursion

Check if Array is Sorted

Ways to Tile a Floor

Count Strings

Friend's Pairing Problem

BACKTRACKING

Find Subsets

Letter Combinations of a Phone Number

Permutations using Backtracking

Print Combinations Of Balanced Paranthesis

N-Queens

Target Sum

Sudoku Solver

Palindrome Partitioning

Check if Number is a Sum of Powers of Three

BINARY SEARCH

Lower Bound & Upper Bound using Binary Search

Place K elements such that Minimum distance is maximized

Game of Greed

Valid Perfect Square

Koko Eating Bananas

Reorder Data in Log Files

Closest Room

Noor and his Pond

BINARY SEARCH

Merge Sort

Quick Sort

Quick Select

Global and Local Inversions

Sam Height

Reverse Pairs

Ternary Search

GREEDY ALGORITHM

Greedy Algorithms Basic

Bulbs

Minimum Number of Taps to Open to Water a Garden

Make It Equal

Too Many Segments

Segment Intersections

MEET IN THE MIDDLE

Meet in the Middle basics

Subsums

Range Queries Intro

SEGMENT TREE

Segment Trees Intro & Implementation

Range XOR Queries

Range Minimum Queries

Xenia and Bit Operations

Petya and Array

Array Stabilization

LAZY PROPAGATION

Lazy Propagation in Segment Tree

Flipping Coins

XOR on Segment

FENWICK TREE

Fenwick Tree Intro

Inversion Count using Fenwick Tree

Range Update Queries

Count of Smaller Numbers After Self

Range Set Query

Longest Increasing Subsequence using Fenwick Tree

SQRT DECOMPOSITION

Square Root Decomposition Introduction

Range Minimum Query using Square Root Decomposition

DQUERY SPOJ using MO's Algorithm

Sorting Queries using MO's Algorithm

Little Elephant and Array

Powerful Array

GAME THEORY

Combinatorial Games Introduction

Take Away Games

Game of Nim

Divisor Game

Sprague-Grundy

Lucky Number Game

Maximum Number of Coins

GAME OF NIM

Game of Bullets

Nim Game II

Stair Game

GRAPH THEORY

Graphs Introduction

Breadth-First Search

Depth-First Search

Astronaut Pairs

Reconstruct Itinerary

Shortest path faster algorithm

Board Game

Message Route

Word Ladder

Valid BFS?

TREE

Tree Introduction

DFS on Trees

Subtree of another Tree

Cut 'em all!

DFS Trees and Backedges

Lowest Common Ancestor Introduction

LCA using Binary Lifting

LCA of a Binary Tree Problem

Distance Queries

Path XOR

Maximum Path

ADVANCED GRAPHS

Topological Sort

Restricted Permutation

Game Routes

Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree

Minimum Number of Days to Disconnect Island

Condensed Component Graph

Maximum Number of Non-Overlapping Substrings - Kosaraju

Connecting Cities with Minimum Cost

GCD on Directed Graph

DISJOINT SET UNION

DSU Introduction

Union-Find

Number of Operations to Make Network Connected

Union By Rank & Path Compression

Make Palindrome

Sum of Maximum Weights

GCD Sort of an Array

Special Paths

SPANNING TREE

Prim's Algorithm

Kruskal's Algorithm

Minimum Spanning Tree Cost

Union-Find

Make It Connected

Build Roads

Ring Minimum Spanning Tree

SHORTEST PATH

Dijkstra's Algorithm

Network Delay Time

Bellman Ford Algorithm

Floyd Warshall Agorithm

Cheapest Flights Within K Stops

Travel by Car

Break Up

DYNAMIC PROGRAMMING

Dynamic Programming Introduction

N-K Ladders

Minimum Jumps

Longest Increasing Subsequence

Maximum Height by Stacking Cuboids

Perfect Squares

Maximum Product Subarray

Find Two Non-overlapping Sub-arrays Each With Target Sum

Path with Maximum Gold

Best Time to Buy and Sell Stock

Boredom

Sleeping Schedule

Palindrome Partitioning

Count All Possible Routes

Modulo Sum

Cherry Pickup

Barcode

Maximum Number of Events That Can Be Attended

Number of Ways to Wear Different Hats to Each Other

Minimum XOR Sum of Two Arrays

Numbers With Repeated Digits

Classy Numbers

Tree with Maximum Cost

Minimum Cost to Reach Destination in Time

Maximum White Subtree

Frog I

Frog II

Maximum Vacation Days

Knapsack 1

Knapsack 2

Target Sum

Longest Common Subsequence

Longest Path

Grid I

Grid II

Coins

Sushi

Stones

Deque

Candies

Slimes

Matching

Independent Set

Flowers

Walk

Digit Sum

Permutation

PATTERN MATCHING

Naive Method for Pattern Matching

Trie Introduction

Pattern Matching using Trie

Word Search

String Hashing - Polynomial Hash Function

Rolling Hash Rabin Karp Algorithm

Longest Common Subpath

Find and Replace Pattern

GEOMETRY

Orientation of 3 ordered points

Graham's Scan Algorithm

Polygons

INTERACTIVE PROBLEMS

Guess the Number

Lost Numbers

XOR Guessing

RANDOMIZATION

Set of Randomized Algorithms

Policy-Based Data Structures

Policy-Based Data Structures Introduction

Inversion Count using Policy-Based Data Structures