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Practice: 

Transform the Expression, Factorial, Small factorials, Enormous Input Test, ATM, Life, the Universe, and Everything, Odd, Place the balloon, Cooling Pies, Choosing Cook Off Problems, N Knights Problem, Newspaper Puzzle, Place-name game, Sum3, Palindrome Palindrome, Grouping Chefs, Wireless Network, Socializing Game around Pizza, Coloring in Hypercube, Large Kitchen, Sines Sum Queries, Longest Arithmetic Progressions, Mean Mean Medians, Longest Weird Subsequence, Rotate the String, Cosine Partition Function, Last Digit Sum, Lame Queen Game, Lucky Number, Ciel and Quiz Game, Ciel and Random Walk, Parallel Computing, Free Shuttle Service, Rubiks cube, Moving between Floors, Enumeration again, An unfortunate incident, No to corruption, Authentication Failed, Careful Calculation, Home Delivery, Spoon in Matrix, Combination Generator, Little Elephant and Swapping, Ciel and a new island, Crease Painting, Gifts at Olympics, Alien Chefs, Triangular Queries, Final Battle of Chef, Level Of Difference, A Relation on Numbers, Printing Sheets, Another Factorial Problem, Chocolates, Crazy Teacher, Corrupt Horse Racing, Call me, Maybe, The Empire Strikes Back, Find the sum, Internet Dating, Save the princess, The Jedi Battalion, Assignments at IITK, The Triwizard Tournament, Operating Systems, Winter is coming, Counting Subtrees, Andrew and the Balls, XOR Sum, Chef and Segments, Very Long Suffix Array, Number of Factors, Transfiguring Trees, Sereja and Graph, Chef and The Recursive Algorithm, Chef and The Colored Grid, Counting D-sets, Tree, Queries With Points, The K-th Path, ForbiddenSum, Dead Mans Chest, Chef and Substrings, Chef and Strange Graph, Chef and the Cake II, Chef and the Orders, Coprime Pairs, Give Away, Chef of The Ancient, The Incredible Machine, Fibonacci Returns, Copy and Paste, Bomberman and the attack of Emperor Terrorin, Power Tower, Break the Password, Crazy Boy, Lottery!, Princess Polynomial, Solve the Puzzle, Final Battle, Distant Relatives, Saying Hello, Substrings and Repetitions, Book Game with Chef, Chef and Tree Game, Count Substrings, Minion Circle, Build the Tree, Divisible Subset, Roots of a Tree, Brand New Game, Rectangle Query, Present for Andrii, Dragonstone, Special Shortest Walk, Random Number Generator, Common Strings, Fibonacci Wars II, Palindromeness, Weird World Cup, Saving a gift of love, Painting the Boxes, Chef Anup, No Unpaired Chefs, How to Repaint a Fence, Shil and Suffix Palindromes, Counting on a directed graph, Dining, Chefs and Voting for best friend, Devu, his sister and Rangoli, Chef and Trees, Chef and Bitwise OR Operation, Attack of the Bugs, Chef and the Cards, Chef and the Number Sequence, Gaming Inversion, Many Lists, Factorial to Square, Chef And A Complete Graph, Chef And Fibonacci Tree, Chef and LCS, Chef and Vectors, Animesh decides to settle down, Superman and the 5th-Dimension, Bit Twister on a Tree, Akhil Recovers The Lost Array, Akhil And Pending Homework, Maze, Akhil And Random String, Right-hand Rule, Alliances, Counting Games, Provinces of ChefLand, Rain vs City, Weird Queries, Chef and Array, Alice, Product of Diameters, Chef and Tree, Find The Point, Sherlock Counts Ways, Sherlock and Smallest Window, FastFood Combos, The Counties, Chef and Numbers, Bear and Segments, Closest points queries, Sticks, Waiting in a Queue, Four Points, Black Nodes in Subgraphs, Matrix Sum, Hull Sum, Chef and Isomorphic Array, Shooting on the array, Meth Cooking, Traffic in Chefland, Sandy the foodie, Queries with GCD, Induced Subgraph, Chef and Chefness, Chef and Line, Replace and Substring Queries, Couples sit next to each other, Queries on Tree, Run Direction, Chef Goro, Picnic with Chef, Exact Walks, Train Journey, Byteland Fest, Ada Function, Elephants in a Pond, Drawing Lines, Maximize the NOSS, Unknown Directory, Gajjo and his Playground, Create Permutation, The New King, Points and Convex Hulls, Our Enemy does not Tire, Nice Subsets, Minimum and Maximum, Equal Median, Gotta Catch Em All, Palindromes Machine, Apples and Oranges, Recipe for Philosopher Stone, Invincible Shield, Stick and polygon, The Evil Professor, Frequency Function, Ordering Cars, The Gifting Problem, Safety in Treeland, Perry learns Binary, Phineas and Marks, Chefina and Strange Tree, Chef and Modular Sequence, Chef and his Ex Girlfriends, Balancing Game, Minimum Insertions, Set Queries, Communication Channel, TWO SACKS OF HAPPINESS, Is this a game theory problem, Guess the row, Sorter Prodigy, AND of Maximums

The November CookOff: 

One Dimensional Game of Life, Cutting Recipes

The December 2010 Cook-Off: 

Preparing Dishes, The Morning Commute, Pairing Chefs

The January 2011 Cook-Off: 

Holes in the text, Chef team, Whole submatrix, Time of collisions

February Cook - Off Challenge: 

Integer Sequences, Breaking Into Atoms, Three Way Communications, Dance Floor Energy

IEM - Kolkata - FESTRONIX - Encoded: 

Developer or Tester, Prime Challenge, On The Floor, Ice-Cream Mania, Jumping Game, Mobius Multiplications, Virus

Conscientia - TGPA 2011: 

The Route, The Key, The Mother-ship

March Cook-off Challenge: 

Money Transformation, Snake Snaky

The DreamSpark Contest - Microsoft Software & Technology Club India: 

The Colors of Corruption

April Cook-Off Challenge: 

The Grand Cook Off, A Prime Conjecture, Internet Media Types

May Cook-off 2011: 

Popular Rice Recipe, Packing the Golden Triangles, Distribute idlis Equally

June Cook-off: 

Correctness of Knight Move, Super-plane

July 2011 Long Contest: 

Large Kitchen, A-E Hash Function, Most Popular Friend

July Cook-off 2011: 

Misinterpretation, Garden Squares, Pleasing Chief

August Long Contest 2011: 

Infinite Grid Game, Complex Spanning Tree

August Cook-off 2011: 

Vote for the Noodle Soup, Open the Dragon Scroll, Rotate the String, Angry Chef - Crispy Chips, Collect the Chocolate Chips

October Long Contest 2011: 

Dish Distribution, Repeated String, Lucky Palin

September Cook-off: 

Last Digit Sum, Digit Rotation, Hotel Bytelandia

October Cook-off: 

Generalized Arithmetic Progression Free Sequence, Permute Digits, First non-Palindrome, Chef Travel Routes

November Long Contest 2011: 

Chefs new Pet, New Restaurant, The Postal Service

November Cook-Off: 

Colorful Chain, Moving Coins, Subanagrams

December 2011 Long Contest: 

Birthday Gift, Robot Movings

December Cook-Off: 

Ciel and New Menu, Ciel and A-B Problem, Ciel and Battle Arena

January 2012 Challenge: 

Houses and Restaurants, Gap Filler Game, Lucky Sum

January Cook-Off: 

Collision in Space, Makx Sum, Zeta-Nim Game

February 2012 Challenge: 

Box and Ball System, Lucky Count, Restore the Recipe, Lucky Long, Find a Subsequence, Smart Chef vs Evil Chef, Word Couting, Count of Maximum

February 2012 Cook-off: 

Bears and Bees, Careful Calculation, Daily Train, Equation Solver

March Cook-Off 2012: 

Ciel Numbers I, Ciel Numbers II, Ciel and Genjiko

April Challenge 2012: 

PDS Number, Lucky Array, Fit to Play, Double Strings, Stacking Pancakes, Greatest Dumpling Fight, Similar Graphs

April Cook-Off 2012: 

Selection for Training Camps, Top Batsmen, Crease Painting, Resistance, Best Buggy Ratings

May Challenge 2012: 

Digits Forest, Killing Gs, Little Elephant and Median, Jewels and Stones, Lucky lucky number, Selling Tickets, Divisible Pairs, Remember the recipe, Little Elephant and Boxes, A Home for Chef

May Cook-Off 2012: 

Little Elephant and Balance, Little Elephant and Strings

June Cook-Off 2012: 

Closing the Tweets, Connecting Soldiers, Golden Trees

July Cook-Off 2012: 

Ciel and Receipt, Ciel and Map, Ciel and Tomya

August Cook-Off 2012: 

Rebuilding Byteland, Codechef Password Recovery, Forced Output, Code Crazy Minions, Asmany Number Verification

September Cook-Off 2012: 

Pizza Tossing, Prime Permutations, Recipe Reconstruction, Carvans, Coal Scam

October Cook-Off 2012: 

Buying Sweets, Equalization, Tennis Tournament, Tree Fun

CodeWeavers 2012 : 

Berry Tough Distribution, Game of Toys, Mixing the Ingredients, Clumsy Tennis , The Great Escape, Packing Candies

November Cook-Off 2012: 

Little Elephant and Magic, Little Elephant and Permutations, Little Elephant and Divisors

December Cook-Off 2012: 

Expected Greatest Common Divisor, Root of the Problem, Packaging Cupcakes, Reversing directions

January Cook-Off 2013: 

Minimum Distance, Many Chefs, Defacing Score

February Cook-Off 2013: 

Lack of Logic, Row and Column Operations, End Of The World 2, Hotel Balifornia 2

TechnoSurge 2013: 

Tower of HanoiCake, Strong and Weak, Almost Prime, Discount on Dishes

March Cook-off 2013: 

The Ball And Cups, Palindrome, Traveling Plan, Level Of Difference, Bishops

Algothika 2013: 

BRIDGING THE GAP, RECALLING NUMBERS, DRUNKEN KNIGHT

OverNite 2013: 

Recruitment, DOTA

Divide By Zero 2013: 

Colouring Drapes, Bertie Botts Beans, Bi Potions, Magical Plate, A Programming Duel, The Illusionist

CodeZilla 2013: 

String Power, ZooZooland Water Shortage, The Basketball Game, Lucky 13, Chef And The Polynomial

Instruo 2013: 

The Palindrome Game, Photo of your friends

Codies 2013: 

Cross The Tiger, Product Division Sum

Kodeathon 2013: 

The Devil Number, Recipe Cluster, Space Adventure, Weightlifting Management, A New Restaurant, Chef and strings

April Cook-Off 2013: 

Andrew and the Birthday, Andrew and the Meatballs, Andrew and the Strings, Andrew and the Meatballs again

Coding 2013: 

Problem 1, Problem 2, Problem 4, Problem 5

May Cook-off 2013: 

Rook Placement, Subtraction Game 1, Subtraction Game 2, Sequence Transmission

June Cook-Off 2013: 

Attic Crossing, Lyra and the Alethiometer, Tywins Tactics, Party Planning

July Cook-off 2013: 

Chopsticks, Compressed String, A Plus B Again!, Counting The Acute Triangles

Lunch Time July 2013: 

Cooking dishes, Paying optimally, Optimal Trip, Entangled Strings

August Cook-Off 2013: 

Chef and The Right Triangles, Chef and The Divisibility Queries, Chef and The String of Digits

ByteCode 2013: 

Help Sherlock, Monkeys, Timon & Pumba

August Lunchtime 2013: 

Pairwise AND sum, Matrix

September Cook-Off 2013: 

Strange Matrix, Game, Code, Big Number

October Cook-Off 2013: 

Polo the Penguin and the Lucky String, Polo the Penguin and the Numbers, Polo the Penguin and the Test, Polo the Penguin and the XOR, Polo the Penguin and the Tree

September Lunchtime 2013: 

Chef and Magic Numbers , Chef and Gift, Chef and Pie, Chef and Science

CodeClash 2013: 

The Real Probability

October Lunchtime 2013: 

Girl Friend and String Gift, Combinatorial Numbers, Exponential Game, Chefs in Queue

Alkhwarism 2013 : 

Divide And Rule, Help Ragetti, Valley of Death, Rescue Jack Sparrow, Flying Dutchman, Jail Break, Jack And Rum

TechFest 2013: 

Land-fill, Lazer Tag, Necklace, TICC, Play with Exponents, King and Magician, Balancing nature, Winning Sequence, Save Energy, Network Connectivity

Inscription 2013: 

Game, Flower Distribution, Wonderland jewellery, Cool Numbers, Little Evan and mouse

November Cook-off 2013: 

Am I a Fibonacci Number, Lowest Sum, Number of Paths, Trees and Subtrees, Rank of the Number

November Lunchtime 2013: 

Lucy and the Number Game, Lucy and the Math Analysis, Lucy and Palindromes, Lucy and Question Marks

December Cook-off 2013: 

Chef and Substrings, Chef Goes Through Segments, Chef and Girlfriend, Chef and Combinatorics

December Lunchtime 2013: 

Perfect Subarrays, Mike and Task Packages, Mike and Matrices , SuperFunction

January Cook-off 2014: 

Chef and the Cake I, Subtraction Game, Interrogating Gangsters

February Cook-Off 2014: 

Chef and Remissness, Chef and Kingship, Chef and Uniqueness, Chef and Reunion

March Cook-Off 2014: 

Game of Divisors, ABC-Strings, XOR Minimization, 3-Palindromes, Dividing Stamps

April Cook-Off 2014: 

Snape and Ladder, BiCo Gaming Grid, Travelling Chef Problem, Distant Relatives

May Cook-Off 2014: 

Substrings and Repetitions, Book Game with Chef, Divide the Cake, Ups and Downs

June Cook-Off 2014: 

Where the Wild Things Are, Counting Flags, Knapsack Problem, Painting, Idols and Fans

July Cook-Off 2014: 

Copy-Paste, Present for Andrii, Sum Queries, Tree Again, Friends

August Cook-Off 2014: 

Tree Game, Permutation Shuffle, Shooting, Count Digits

September Cook-Off 2014, ACM-ICPC Warm up: 

Sherlock and the Grid, Subarray GCD, Subarray LCM, World War 2, Updating Edges on Trees

October Cook-Off 2014: 

The Dirty Path, The Army, Walk on the Axis, Substring and five rules, Mahesh and his lost array

November Cook-Off 2014: 

Covering Sets, Lost Graph, Most Distant Points, Brackets, Petersen Graph

December Cook-Off 2014: 

Servers, Jam, Matrix Again, Player, Good Joke!

CodeX 2014: 

Sum Up, Willy Wonka and Candies, The Kings Idea, Subset Sum, Android #18, The Armory, The Escape, Game Of Sticks, GCD Sum

January Lunchtime 2014: 

Chef and Shop, Chef and String, Chef and Numbers, Chef and Way

February Lunchtime 2014: 

Sereja and Two Arrays, Sereja and ASum, Sereja and D, Sereja and Arrays

Divide By Zero 2014: 

Sherlock and the Ciphers, Sherlock and the Perfect Array, Sherlock and Inversions, Sherlock and Subtrees, Sherlock and the Great Game

Code Currents 2014: 

Rihanna and Fibonacci, Rihanna and Chris Brown, Rihanna and Her Company, Rihanna and Triangles

CodeCrusade 2014: 

Playing with Shapes, Twins Birthday

April LunchTime 2014: 

Minimum Product, Minion Circle, Knight Fork, Tracy and Charlie

March Lunchtime 2014: 

How many sequences, Nice SubSegments, A Game With a Sheet of Paper, Statements Checking

May Lunchtime 2014: 

Divisible Subset, Approximately II, Roots of a Tree

June Lunchtime 2014: 

Substring Query, Coprime Triples, The Smallest Pair, Dynamic Inversion

July Lunchtime 2014: 

And Operation, Shift The String, Lowest Common Ancestor, Simple Editor

August Lunchtime 2014: 

Harrenhal, Wall, Iron Islands

September Lunchtime 2014: 

Chef and easy problem, Chef and easy problem 2, Chef and medium problem , Chef and medium problem 2

October Lunchtime 2014: 

Tanu and Head-bob, And Tuples, Physics Class, Cascading Style Sheets

Procon 2014: 

Plotting Good Graphs, Happy Birthday Kazima, Hotel Palama Palace

November Lunchtime 2014: 

A wolf, a sheep and cabbage, Deja Vu, Yet another substring problem, Dividing the Students

December Lunchtime 2014: 

Delivery Man, Sum Of Binomial Coefficent , Queries On Tree, String Matching

CodeStrike 2014: 

ROSE, Not So Even Tree

January Cook-Off 2015: 

Suraj goes shopping, Tojo hates probabilities, Anup at Amrithapuri, Random Rudreshwar, Abhijeet and rectangles

January Lunchtime 2015: 

Piece of cake, Candidate walk, Just multiply, Many bananas

February Cook-Off 2015: 

Zombinatorial, Parenthesis with Maximum Sum Subarray, Fit Squares in Triangle, Strategy for the World Cup

March Cook-Off 2015: 

How to Minimize a String, How to Choose a Subset, How to Write a Message, How to Repaint a Fence

April Cook-Off 2015: 

Lucky Fives, Special Agents, Taxi Driver, Equality, Version Control System

May Cook-Off 2015: 

Devu, his friends and birthday gifts, Devu and friendship testing, Devu and decorating birthday cake, Devu and most energetic minion

June Cook-Off 2015: 

Ankit, Srijan and a game of stone piles, Bored of Nim, Longest non regular parentheses sub-sequence, Strange operations

July Cook-Off 2015: 

Cops and the Thief Devu, Maximize Disjoint Pair Sum, Path containing K Nodes, Adding Special Sum, Adding Up Sequences of Towers

August Cook-Off 2015: 

Chef and the XORed Number , Chef and the Number Sequence, Chef and the Wildcard Matching

September Mega Cook-Off 2015: 

Reign 2, Counting Subgraphs, Forgotten Language, Super Numbers, Stacks

October Cook-Off 2015: 

Palindrome Pairs, Second LIS, Word Stem, Almost Sorted Permutation

November Cook-Off 2015: 

Sereja and Line, Sereja and Array and Subtracting, Sereja and Pairs, Sereja and Tree, Sereja and Tree 2

December Cook-Off 2015: 

Chef and Subarrays, Chef and Queries, Chef and Tree

February Lunchtime 2015: 

Lucky Four, Heavy-light Decompositions, The Warehouse, The First Cube

April Lunchtime 2015: 

Palindromeness, House Cleaning, Euler Totient Function Extended, Tickets

May Lunchtime 2015: 

Devu and Grapes, Maximum Matching, Devu and Manhattan Distance, Number of Ways

June Lunchtime 2015: 

Chef and Bitwise OR Operation, Chef and Submatrix, Chef and Two Strings, Chef and Sets

July Lunchtime 2015: 

Greedy puppy, Puppy and GCD, Puppy and game, Puppy and cats

August Lunchtime 2015: 

Churu and lost string, Gaming Inversion, Make Palindrome, Minimum Maximum

September Lunchtime 2015: 

Coffee Breaks, Many Lists, Pattern matching, Sum of palindromic numbers

October Lunchtime 2015: 

emitL, Save the nature, Fast squarer, Estimating progress

November Lunchtime 2015: 

Chef And A Complete Graph, Query over Matrix, Black And White Cells, Product on Tree

December Lunchtime 2015: 

Computer Network, Ancient Berland Roads, Buying Seedlings, Distinct Codes

CodeOut 2015: 

Sucho and his Students

Divide By Zero 3.0: 

Shil and Triplets, String Match, Shil and Suffix Palindromes, Utkarsh and LCM, Utkarsh and Long Roads, Utkarsh Lost in Cities, Shil and the Toy Factory

January Cook-Off 2016: 

Chef and Destruction, Chef And Palindromes, Chef and Maximum Sum Matrices , Chef And Fibonacci Tree, Chef and Fruits

February Cook-Off 2016: 

Puppy and Palindromes, Puppy and Catchers, Puppy and Board, Puppy and Sum

March Cook-Off 2016: 

Not even planar, Digital clock, Dual Nim, Alternating subarray prefix, The potato problem

April Cook-Off 2016: 

Movie Weekend, Odd Divisors, Queries on a Binary Tree, LCP Maximization, Bit Twister on a Tree

May Cook-Off 2016: 

Phantasialand, Easy Numbers, Tandem

June Cook-Off 2016: 

Sticks, Right Triangle, Cutting Cake, Chef Land, Range Minimum Queries

July Cook-Off 2016: 

Chef and Proportion, Chef and Numbers, Chef and Land, Chef and Array, Chef and Sort

August Cook-Off 2016: 

Tweedle-Dee and Tweedle-Dum , Math Hatter, Mock Turtle, Queen of Hearts

September Cook-Off 2016: 

Lazy Jem, The Lost Arithmetic Sequences, Counting Strings, Shortest path queries

October Cook-Off 2016: 

Sherlock and the Ugly Flower, Watson asks Does Permutation Exist, Sherlock Counts Ways, ChefWatson uses Social Network, Sherlock and Smallest Window

November Cook-Off 2016: 

Sebi and the equation 2, Sebi and the cube, Sebi and the highway, Sebi and the black money, Sebi and the corrupt goverment

December Cook-Off 2016: 

Chef and Subset, Chef and Subarrays, Chef and Queries, Chef and Numbers

January Lunchtime 2016: 

Peaks, Exponential Sub-Palindromes, Table Covering, Triangle Classification

February Lunchtime 2016: 

Chef and Socks, Chef and Tic-Tac-Toe, Chef and Polygons, Chef and Dominating Subarrays

March Lunchtime 2016: 

Two Closest, Arrays Sum, Simple Statistics, ABABAABA

April Lunchtime 2016: 

Maximum K Sums, Tree Coloring, Tree Labelling, Coins And Triangle

June Lunchtime 2016: 

Collisions, One more weird game, Square in numbers, Travelling in a tree

July Lunchtime 2016: 

Will and Closed Set, Drumpf for President!, Lumpy - The Bus Driver, So Close Yet So Far

August Lunchtime 2016: 

Studying Alphabet, Short in Average, Lock-Free Stack

September Lunchtime 2016: 

Chef and Inequality, Chef and Words, Chef and Tree

October Lunchtime 2016: 

Restore the Permutation, FastFood Combos, The Largest Bouquet, The Counties

November Lunchtime 2016: 

Chef and his Students, Chef and Square Set, Chef and Balanced Polygons, Tom & Jerry

December Lunchtime 2016: 

Superheroes and villains, Fly height mode, MST Queries

Codigo-2016: 

Ash and PokemonGo, Skill Managment, Sinchan and Cake, Sultan and Sons, Rabbits and Carrots

Codeathon: 

Gotta Catch them all, The Revolutionary War, RCGs

January Cook-Off 2017: 

Digit Longest Increasing Subsequences, Xor Grid, Matrix Transformation, Digit Longest Increasing Subsequences 2

February Cook-Off 2017: 

Download file, To add or to multiply game, Mixing flavors, Chairs, Cooking Game

January Lunchtime 2017: 

Sealing up, Nothing in Common, Improve the Permutation, Segment Queries

February Lunchtime 2017: 

Bear and House Queries, Bear and Milky Cookies, Bear and Bribing Tree, Bear and Oveflow Points

March Cook-Off 2017: 

Rainbow Graph, Meeting location, Yet Another Card Game, Increasing Xor Sequence, Safe Robot

May Cook-Off 2017: 

La Liga, Balanced Array, Hussain Set, Nasty Queries, Binary Tree

June Cook-Off 2017: 

Ada and crayons, Knight Covering, A Study in Bake Street, SnackUp, Centeroid

July Cook-Off 2017: 

Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples, Chang and Beautiful Sequences, Bipartite Graph from Trees

August Cook-Off 2017: 

Tree Connectivity, Game on Stick, Matrix and Chef, Real obtuse, From heaven to earth

September Cook-Off 2017: 

Numbers Game, Infinite OR Game, Statistics Construction, Subsequence Equality, Mixing Colors

October Cook-Off 2017: 

Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries, Chef and Dancing Steps, Chef and Math Test

November Cook-Off 2017: 

Hasan and boring classes, Skiing, Online Chess, Random Pair

December Cook-Off 2017: 

Minimum SubArray, Rotate Point, Beautiful Array, Football Match

April Lunchtime 2017: 

Bear and Digit Virus, Bear and Segments, Closest points queries, Bear and Segment 01

May Lunchtime 2017: 

Prefix Inversions, Post Tree, SubInversing

June Lunchtime 2017: 

Maximum Unique Segment, Two Numbers, Company and Club Hierarchies

July Lunchtime 2017: 

Find the Maximum Value, Good Pairs, Travel to all Points, Divide the Set

August Lunchtime 2017: 

Mathison and the Dynamo shuffle, Mathison and pangrams, Mathison and the teleportation game, Mathison and the cubic tree

September Lunchtime 2017: 

Chef and Dice, Chef and Cook-Off Contests, Chef and Programming Contest by His Friend

October Lunchtime 2017: 

Weird Competition, Optimal Subset, Buggy Calculator, Maximum Number

November Lunchtime 2017: 

Smart Strategy, Shuffling, L-R queries, Strange Queries

December Lunchtime 2017: 

Days in Month, Strange Function, Too Much Sweetness, Four Friends

IOPC 2017 (Rated): 

The Birthday Tears, Game Of Life, Max Out, Christmas Time, Solve the Assignment, Help your friends

Innerve's Summer Code Challenge: 

Suhana and Matrix World, Girls and Security Patrol, Girls and Historical Similarity of Strings, Suhana and Horror House, Suhana and Equation, Isha and Odd Cycle, Isha and Ruined Floor

CodeChef Coding Competition: 

life and everything, Think Pattern, print_codechef, express_same, minimize_path_cost, Largest Number formed from an Array

January Cook-Off 2018: 

Multiple of 3, Make array great again, Finding the matrix, Survive in ChocoLand

January Lunchtime 2018: 

Chef and Game with Sequence, Chef and Average on a Tree, Chef and Function, Chef and Escaping from the Labyrinth

Keteki quick match 6: 

N Sequence (Keteki), Max Subarray (keteki)

Blueprint: 

Prateek and Graphs, Strange Fibonacci, Weather Dilemma, Fibonacci Powers, Bibhu and Sio

Keteki Quick Match 6.5: 

Smiling Queen(keteki), Swap Group (keteki)

February Lunchtime 2018: 

Prefix borders, Game with numbers, Jumping in the hills

Hackon Feb: 

Squares, Praveen, Circles, Lucky string, Entertainment Fair , Hubby Bunny

March Cook-off 2018 Division 1: 

Maximum Tree Path, Chef Goes to the Cinema, Chef Restores an Array, Chef Chooses a Subset, Chef Restores a Matrix, Chef Judges a Competition

April Cook-off 2018 Division 1: 

Run Direction, Binary Nim, Pawn Chess

May Cook-off 2018 Division 1: 

Difficult Choice, Best Cake Ever, Searching for the Recipe

June Cook-Off 2018 Division 1: 

Masha and Minions, Sonya and Segments, Danya and Numbers, Batman and Tree, Good Permutations

July Cook-Off 2018 Division 1: 

OR Matrix, Finding Second Maximum, Chef and Queries on a Tree, Chef and GCD Game

August Cook-Off 2018 Division 1: 

GukiZ and Candies, Mixi Game, Hack Fulu, No Queries No Fun, Standard Tree Task

September Mega Cook-Off 2018 Division 1: 

OneTwo, Learning Dishes, Dot It, Make a Permutation, Ghayeeth vs Siroj

October Mega Cook-Off 2018 Division 1: 

Binary Nim 2, Pumping Water

November Cook-Off 2018 Division 1: 

Data Pipelines, Beautiful Garland, A-B Game, Tree Unattractiveness, Elephants in a Pond

December Cook-Off 2018 Division 1: 

Count Subsequences, Swag Subsets, Yalalovichik Numbers, Yalalovichik Strings

April Lunchtime 2018 Division 1: 

The hardest gcd problem, Triple-tree decomposition, Solve what you want, Fast forward travelling, Darts

May Lunchtime 2018 Division 1: 

Sum on Tree, Count Substrings, Shifted Palindrome, Weak in the Middle, Maximum Plus

June Lunchtime 2018 Division 1: 

Unusual Sorting, Sort the Leaves, Permutation Composition Queries, Summary Power

July Lunchtime 2018 Division 1: 

Forced Particles, GCD Sum, Make a String, MEX and Ranges, Prime divisors

August Lunchtime 2018 Division 1: 

Chef and Eid, Swimming Pool, Mix Mix Game, X and Two Groups, GukiZ Has More Candies

September Lunchtime 2018 Division 1: 

Biased Judgement, Opposite Cites, Chef Restaurant , Match the Streams, Coin Partition

November Lunchtime 2018 Division 1: 

Useful Number, Median, Maximize It, Probability, Beats and Pieces

October Lunchtime 2018 Division 1: 

Robots Again, Coloring the Grid, Weird Question, Tree Walk, Niceness of the Arrays

ALKHWARIZM (Rated): 

Harry in the Chamber of Secrets, Help Voldemort, Hedwig The Smart Bird, Room Of Requirement, Harry Potter and the Goblet of Fire, Harry Potter and the Deathly Hallows - 2, Deathly Hallows and The Cloak Of Invisibility, Wingardium Leviosa, Sam, The Charming Angel

Code Melange (Rated): 

XD Subsequences, Subsegment Sum, Y Figures, Xorangements, CPI Crisis, Longest Constrained Subsequence, The Deadly Sin, Computer Virus, Candy Love

Coders' Legacy 2018 (Rated): 

Useless Clocks, Fibonacci String, Killing Zombies, The Kingdom of Ererraveth, Triangles in a Grid

CodeAthon: 

Sword Fight, Prime Game, Byteland Fest, Photoshoot, Special Pens, Mysterious Week

ProCon 2018 (Rated for all): 

The Great Run, Kill them with your success, Awkward Pairs, Algebra Score, Good Speech, The Illusionist

Elektra 3.0: 

TomorrowLand, Chefu and Chocolates, Chefi and PUBG Sea Drop, Chef and Prime Domination , Jack, Jill and Chefland

January Cook-Off 2019 Division 1: 

Ada School, Ada Pawns, Ada Matrix

January Lunchtime 2019 Division 1: 

Distances, Wanderer, Rooks, Mouse Meets Cheese

Innovacion 2019 : Algorithmist: 

Up to Mark, Unknown Directory, Trip to Wonderland, Bags and Balls

February Cook-Off 2019 Division 1: 

Max Range Queries, Chef and Secret Password, The Most Amazing Dish, Chef in Evil Land, Chef and Party

February Lunchtime 2019 Division 1: 

Roll the Bar, Families of Chefland, The Tricky Deal, Chef Challenge

Encoding January'19: 

Dungeons & Dragons, Chef and Ice Cream, Chef and Text, POLYGONS, Chef and Movie, Chef And His Society, Chef And game, Chef And Life, Chefa tests Chef

Code Mutants 2019: 

Magic Rods and Bits, Welcome to CODE MUTANTS!!!, Mystery behind U_Square

March Cook-Off 2019 Division 1: 

XOR N-bonacci Sequence, Points and Convex Hulls, Markers and Caps, The Frictionless Bisected 2-Dimensional World, Music Shopping

March Lunchtime 2019 Division 1: 

Corrupted Seven-Segment Display, Tree Flow, Travelling Saleschef, GCD Subsequences, Partition into Permutations

Coders' Legacy 2019 (Rated for all): 

Bathwater, Metro, IPL and RCB, Up for a Game, Paths

CodeMutants Revisited: 

The Final Battle, Will Cersei die!, The Dothrakis, Strongest Weapon, Dracarys, Melisandre and her Vision

April Cook-Off 2019 Division 1: 

Doubly Increasing Path, Random Game, Pied Piper vs Hooli, Mystery Tree, Guess My Age

April Lunchtime 2019 Division 1: 

Dream Problem, The Last Droid, Firdavs and Planet F, Minimum Sum, Chef Rami and Inventions

ICM Technex 2019: 

Pika-Pika, Good Sequence, Array got some moves, Bob and his strict mom, Yet Another Counting Problem

May Cook-Off 2019 Division 1: 

Misha and Nice Sets, Bitsetbaba and Power Grid, Expected Xor, Searching for a Biclique

May Lunchtime 2019 Division 1 (Unrated): 

Grid Tour, Reverse Maximisation, XOR Magic, Intervals and Intersections, Abdullah and Toll Discounts

June Cook-Off 2019 Division 1: 

Zawad and Index Sum, Nice Subsets, The Secret Recipe, Ants and Anteaters, Drink Slush

June Lunchtime 2019 Division 1: 

Fuzzy Conversions, The Grux Permutation , Gii and His Club, Igzi and Burly Array, Ivan Pesic and His World Tour

July Cook-Off 2019 Division 1: 

Birthday Gift Again, War in Treeland Again, Minimum and Maximum, Magical Menu, Expected Product

August Cook-Off 2019 Division 1: 

Magic Permutations, Warriors, Rich Substrings, Friends and Candies, Two Circles

August Lunchtime 2019 Division 1: 

Beauty of Pairs, Beauty of Segments, Equal Average, Destroy Cells, Chef Does Coke Yet Again

September Mega Cook-Off 2019 Division 1: 

Save Jewels, Angry Grandfather, Hiring Chefs, Fitness Exercises

September Lunchtime 2019 Division 1: 

All Substrings, Ice Cream Queue, Treeversion, Apples and Oranges, Find the Sum

October Mega Cook-Off 2019 Division 1: 

D-Function, D-Value, Hidden Sequence, D-Or

October Lunchtime 2019 Division 1 (Unrated): 

Counting Inversions Again!, Double Distance Query, Box Game, Kth Numbers

November Lunchtime 2019 Division 1: 

Team Trees, Planting Trees, Washing Windows, Perfection, Servers

December Cook-Off 2019 Division 1: 

Xor It, Crash It, Make It, The Inexplicable Giant Floating Baby Head

Alkhwarizm (Rated for all): 

Arya and the Grid of Stars, Cersei and her Soldiers, Game of Theory, Winter Is Here, Weirwood Trees, Danny Wants To Know, They are COMING

Null Void: 

Chef and Travel, Chef and Chess, Yeh PUBG waala hai kya, Análisis de devansh, Ross and DFS, The Travelling Students

January Cook-Off 2020 Division 1 : 

Almost Palindromic, Profitable Paths, Count It, Range AND, Chefina and Sums

February Cook-Off 2020 Division 1: 

Must Be Divisible, Maximum Subsequence Sum, XOR Game, Sweetest Candy , Chef and Pepperoni Pizza Again

March Cook-Off 2020 Division 1 : 

Mysterious Sequence, A Tree to Remember, Maximize Letter Beauty, Random Chocolates, Escape the Tree

April Cook-Off 2020 Division 1 : 

Tower Counting, Simple Operations, Inversions in Permutations

May Cook-Off 2020 Division 1: 

Chef, Chefina and Their Friendship, Chefland Squads and the Army Chief, Chefina on a Trip, Roads in Chefland, Curious Queries

January Lunchtime 2020 Division 1: 

Minimum and Maximum, Construct Array, CCDSAP Exam, Under the Tunnels, Folding Paper

February Lunchtime 2020 Division 1: 

Coronavirus, Painter Problem, Swapping to Palindrome, Monsters Battle, Secret Mission

April Lunchtime 2020 Division 1: 

Dot Time, Xor Jar Muluk Tar, Triangle Query, Positive Mex

May Lunchtime 2020 Division 1: 

GCD of the Submasks, Absolute Min Max, Escape One, Convert the String, Tree difference

ALCoding Club: 

Gotta Catch Em All, Equal Balances

D'Code Division 1 (Unrated): 

Full Barrier Alchemist, The Promised Land, Grumpy Granny, Equivalent Exchange of Triangles, Recipe for Philosopher Stone, Invincible Shield, Transmutation Diamonds

Heist: 

Bank Cooperation, Ordering Cars, Digit Game, Algebra, Villages

Fall For Code 3.0: 

Gump Loves Palindromes, Find Duplicates, Chef and his swimming, Eddy Wants Admission, Prime Lover, Minimum Path

Blueprint: 

Problems (Easy version), Problems (Hard version), World War 3, Library Problem, Simple Array, Correct Position

Decathlon: 

Chef and Sum, Chefina and GCD, Chef and Restaurant, Chefina and XOR, Chef and Robot, Chefina and Beautiful Pairs

Runtime Terror: 

Interesting Sum, Devotee of god, Bitwise Operators, Encryption of message

Overnite Coding: 

The Leaderboard, The Password, Carnival of Conundrums, Transitions, Magical Islands, Battle of Mirror-Verse

UWCOI 2020 (Rated for all): 

Button Pairs, Base Plans, Peak Finding, Blocks, Mercury Poisoning, Escape, Optimal Memory Address

CODIGO 2K20: 

Baba And His Blessings, Chef and Tiling, Weird Function, Moony and ICPC team, Tales from the Mortytown, Noine Noine, FrosT or DustinKiller

Code Invicta: 

Bring Positivity, Fairy Tales!!, Find the XOR, Generous Raju, Back In 2 minutes!!, Divide them all

Mystery Language: 

STICKY CARS, Problem with Cubics, Ashish and Holidays, Sunny and Bitland, Alex and Chocolates, A Game of Palindromes

Cook the Code: 

Fill The Boxes, Tricky Remainder, Lockdown Loss, Nine Pallindromes, Mystric Balls

July Cook-Off 2020 Division 1: 

What Is This, a Crossover Episode, MEX-ception, The In-XOR-able Task, Even-tual Reduction, OR-thodox Distinction, Path-etic Products

July Lunchtime 2020 Division 1: 

Profitable Paths 2, Golomb Sequence, Coloured Pairings, Binary Concatenation , Pairs of Pairs

August Cook-Off 2020 Division 1 : 

Red-blue Trees, Polygon Relationship, Chefina and Dishes, Beautiful Subsequence

June Lunchtime 2020 Division 1: 

Maximum AND, Chef, Chefina and Restoration, Kuroni and the Cowsheds, Gold Mining, Square Submatrices

RECode 12.0 (Rated for all): 

Chef and String, Chef and Walk, Chef and Rotation, Chef and Or, Chef and Subsequences, Chef and Array, Chef and Numbers

October Cook-Off 2020 Division 1: 

Path-etic Sums, An Inveractive Problem, The In-XOR-able Task, Isomorphic Morphism, Yet Another Crossover Episode

November Cook-Off 2020 Division 1: 

Flip the String, Chef and IPC Certificates, Graph Construction, Hiring Workers

October Lunchtime 2020 Division 1: 

Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Counting Spaghetti, Cute Chef Gift

November Lunchtime 2020 Division 1: 

Gasoline, Fractions, Circle Eating

Programming Contest #1 (Chapter 'Ramayan'): 

Laxman and Maths, Hanuman and Tree, Raavan and Sub-Array, Bharat and Possibilities, Lord Ram and XorOrXorOr Power, Luv Kush and FX Sequence, Sita Mata and Time Machine

Code Chronicles 1.0: 

Champak and Clocks, Odd One Out, Marking the Borders, PWCP, Maze Runner, Sharing is Caring!, Time Travel, Chef and a New Home

CodeChamp: 

Shaun And His Subarrays, Hot and cold Tanks, Two Armies, Matching Parenthesis, Protests, Allocating Covid Beds

Lost in Code: 

Distribute Candies, Omi and Segment Trees, Omi and matrix, Pyramid of string, Ish and String Game, Ish Food Distribution

Biteration #3: 

C - Smallest String, D - Minimum Cost, E - K BOXES, B - Jumping Monkey, A - All Vowels

Project Code 2.0: 

Space Wrap, Flash tries MBA, Genesis, Sandy Tries English, Chef and Bank, Alien Invasion, The Walking Dead

Coders' Legacy (Rated for all): 

Chef vs Doof, Doof on Cartesian, Doof fires Brackets, Jeremy gets a gift, Perry learns Binary, Unique Substring

Code Chronicles 2.0: 

Binary Inscription, Chef and his love, Simple Inversion, Chef and the medals, Chef and his Ex Girlfriends, Miku and lines, Chef and Alphabets, Weird Sum Queries

September Cook-Off 2020 Division 1 : 

Joined Subarrays on Tree, Balancing Game, Maximise Subsequence Value, Minimum Insertions, Graph Labelling

September Lunchtime 2020 Division 1: 

Permutation Split, Root the Tree, Robot Detector, Few Different Elements

CodeFusion 20.9: 

IS THIS A STANDARD QUESTION , INCREASE YOUR SKILLS, JUST FIND IT, PATH QUERIES, NUMBER OF WAYS, MINIMUM PATH COLORING, CRITICAL NODE

LogiCode: 

MATRIXMIN, Average Median Game, THE SEIGE, FIZZA and MAGICIAN, FALLING RODS, CHEF MAKES GOOD PAIRS, MonkeyPower

Programmers Army Monthly Contest - Arrays: 

Frequency Array, Gold Collection, Birthday of Anabelle, Championship, Compartment Weights

Placement Preparation Week 1: 

Special Products

CodeSprint: 

PRO BARGAINER, Empires Name, 3 Friends and GOA trip, Stock Scam, Find index number, Maximum Cost

push_back(1): 

IGNORE IT, REMOVE IT, DECODE IT, CRACK IT, SQUARE IT IS, FIND IT, COUNT IT

Inferno Numero IIT BHU: 

Jewel Mine, WIN IT, CHRISTMAS EVE, Good Array, Illuminated boxes, Couple In Ruiz Land

pop20push21: 

FINISH ALL THE SWEETS, BOX REDUCTION, TWO SACKS OF HAPPINESS, PROMISES WE MAKE, AS EASY AS ABC

Code Aaj Kal: 

Obsession with 7, Chefs Special Palindrome, Chef and 2 Strings, Cheems The Lover, Halry vs Harry, Jethalal and Mehta, Bouncing Lights, Sale of Watches

Programmers Army Monthly Contest - Bit Manipulation: 

Help Bob! , Magical Game, Chef Need Help, Solve This

JUST CODE IT 3.0: 

Minimum operations, Power of 2, Chef needs Help, Chef and Tourism, Chefina and Candies, Chef’s Number Puzzle

Codelicious'21: 

Weird Divisibility, Array subarrays, Count the Count, Soumya wants to buy a tree, GCD Operations, Equation

Code Invicta: 

Decode The Number, Match The Rhyme, Freelance Client, Knapsack, Maya’s Blog Query, Lets Sort It!, cAn YoU sOlVe It

Decathlon: 

Cesium Capsules, Particle Beam Wrist Watch, Sentient Butter Passing Robot, Evil Morty, Mr Meeseeks, Wormhole Trips

Code Aaj Kal 2.0: 

Game of Primes, Run It Back, How I Met Your Mother, Cheems VS Doge, Buy Masks, Books and Friends

Plagiarism -275: 

Code Checker, Chef making Pillars, Chef The Admin, Plag Detector , MOSS

SnackDown 2021 - Online Qualifiers: 

Prefix as a Substring 2, Lucky Number, Maximum Number Of Distinct Elements, Minimise Difference

The Code Dungeon: 

F - Number Game, C - Tree Sum, E - Choosing Candies, A - New Adventure, D - Linear Paradise, B - Coin Trade

SnackDown 2021 - Online Round 1A: 

Yet Another Flipping Problem, Round Robin Ranks , Dance Moves, Equal Beauty, Min Max LCM

SnackDown 2021 - Online Pre-Elimination: 

Non-Decreasing Subsequence of size K, Good ranking, Product Pain, Guests like slippers, Mega mu - 1

Code Senso Division 1 (Unrated): 

Sardar and GCD, Maximum Damage, Bank of Wasseypur, Games of Wasseypur, Gun Distribution, Magic Weed, Farmers of Wasseypur

SnackDown 2021 - Online Elimination Round (Rated for all): 

One Change Subsequences, Random Convex Hull, Graduate Work Matters, Sorting Segments

SnackDown 2021 - Final Round: 

Ones Guessing, Equal Number of Prefix Maximums, Finally, Non Ad-Hoc Problem, AND of Maximums

ReCode [UNRATED]: 

Password Decryption, Sweta-The Clever Girl, Find jth element in ith row of a Pascal Triangle, Sweta reaching the end of array, Abu and the Numbers

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