Tiancheng Lou

October 2009 (Contest IX)

Congruent triangles, A puzzle game, Paragraph Formatting, Just a simple sum, Kayaks, Forces in the crystal

March 2010 Contest

Treasure Hunting, K-important Strings, Tri-Hexagonal Puzzle

May 2010 Contest

Nice Quadrangles, Rendezvous, Summing Slopes

August 2010 Challenge

Exit code

November 2010 Challenge

Randomly Testing Circuits, Bombing, Graph Challenge, Chefs Bad Day, Renting Spare Oven Time, Balanced Walks

January 2011 Challenge

Restaurant Expansion, Chess Pushing Game, Flu Shot Lineup, Splitting Giant Subs, Count Relations, Chef attic window

March 2011 Challenge

K-Unique Sequence, Ski Resort, Squares Game, Buying Land, Omax, The Amazing All-In-One Cooking Machine - Challenge

March Cook-off Challenge

Money Transformation, Palindrome Palindrome, Snake Snaky, Grouping Chefs

April Long Contest

Gravel, Number Game Revisited, Generalized Independent Sets, Graphs in Euclidean Space, Central Point, Rectangles Counting

May Long Contest 2011

Pruning Trees, Tree Product, The Great Wall of Byteland, Bickering Cooks, Sum Divides Product, Harmonious Decorating

August Long Contest 2011

Coloring in Hypercube, Infinite Grid Game, Something About Divisors, Shortest Circuit Evaluation, Block Drop, Complex Spanning Tree

September Long Contest

Haunted Maze, Younger Brother, BIT Magazine, Table Tilt, Counting Hexagons, Short

October Long Contest 2011

Sine Partition Function

November Long Contest 2011

Colored Domino Tilings and Cuts, Chefs new Pet, New Restaurant, The Postal Service, Stepping Average, Lucky Days

December 2011 Long Contest

Birthday Gift, Robot Movings, Ciel and Eggs, Short II, Hypertrees, Spinning Wheels

January 2012 Challenge

Misinterpretation 2, Ambidextrous Chefs, Houses and Restaurants, Gap Filler Game, Lucky Sum, Card Shuffle

March 2012 Challenge

Tom And Jerry, Longest Weird Subsequence, Cosine Partition Function, Evil Book, Lucky Number, Free Shuttle Service, Home Delivery, Spoon in Matrix, Ciel and Earthquake, Xor it

April Challenge 2012

PDS Number, Lucky Array, Parallel Computing, Fit to Play, Double Strings, Find a special connected block, Substrings on a Tree, Stacking Pancakes, Greatest Dumpling Fight, Similar Graphs

June Challenge 2012

Closest Points, Polynomial Partition Function, Little Elephant and Product, Little Elephant and Candies, Magic Hull, Expected Maximum Matching, Doom Bakes Cakes, Cool Numbers, Fly-overs, Arranging Cup-cakes

August Challenge 2012

Two Magicians, Little Elephant and Bombs, Lucky Driving, Game Count, Eastern Draughts, Block Game, Range of Data, Delivery Boy, A Game of Thrones, Machine Gun

September Challenge 2012

Simultaneous Nim, Lights, Kisses & Hugs, Chef World, Racing Horses, Queries About Numbers, Knight Moving, ChefTown Parade, Annual Parade, Three is Crowd

October Challenge 2012

Team Formation, Little Elephant and Order, Fierce Battles, Event Organizer, Maximum Sub-rectangle in Matrix, Blade Master, The New Scheme, Max Circumference, Ciel and password cracking, Need More Diamonds

November Challenge 2012

Lucky Balance, A Wonderful Chocolate, Delicious Dishes, Candy Collecting Game, Coin Flip, Jam Board, Martial Arts, Many Left, Sridhar Likes Travelling, Arithmetic Progressions

December Challenge 2012

Sereja and Data Structures , Granama Recipes, Arigeom Beats, Book Exercises, Magic Rankings, Different Trips, The Uncountable Ways, Pizza Delivery, Quasi-Polynomial Sum, WordNinjas

January Challenge 2013

Little Elephant and Alcohol, A New Door, Dividing Products, Hotel Balifornia, The Minimum Number Of Moves, End Of The World, A Fence for Byteland, Cucumber Boy and Cucumber Girl, Chef of the Year, Three Different Numbers

February 2013 Challenge

Little Elephant and Cards, Buy1-Get1, Room Corner, Magic Board, Triangular Queries, Climbing Stairs, Vacation, Observing the Tree, Word Play, Efficient Painting

May Challenge 2013

Matchsticks, Witua and Math, Tree Counting, Queries on tree again!, Chef Protection Plan, Password Cracking Challenge, Juno Puzzle for May, Name Reduction, Your Name is Mine, Field Trip

July Challenge 2013

Across the River, Needles and Pins, Mountain Holidays, Galactik Football, The Probability Of Winning, Furik and Rubik and Sub Array, Chef and Walking on the rectangle , Count K-Primes, Sereja and Sorting, Circle of death

July Cook-off 2013

Chopsticks, Compressed String, A Plus B Again!, Very Long Suffix Array, Counting The Acute Triangles

Lunch Time July 2013

Cooking dishes, Paying optimally, Optimal Trip, Entangled Strings

August Cook-Off 2013

Chef and The Recursive Algorithm, Chef and The Colored Grid, Chef and The Right Triangles, Chef and The Divisibility Queries, Chef and The String of Digits

September Challenge 2013

Little Elephant and Exams, Merciless Chef, Cool Guys, Chef and Integers , Project Spoon, CAO Stage-1, CAO Stage-2, To Queue or not to Queue, Two Roads, Sereja and Snake

September Cook-Off 2013

Strange Matrix, Game, Tree, Code, Big Number

January Challenge 2014

Magic Trick, Counting The Important Pairs, Sereja and Graph, Counting D-sets, ForbiddenSum, Meteor, Byteland Tours, Bon Appetit, Please like me, Chef and Feedback

January Cook-off 2014

Chef and the Cake I, Chef and the Cake II, Chef and the Orders, Subtraction Game, Interrogating Gangsters

February Cook-Off 2014

Chef and Remissness, Chef and Kingship, Chef of The Ancient, Chef and Uniqueness, Chef and Reunion

June Cook-Off 2014

Where the Wild Things Are, Counting Flags, Knapsack Problem, Painting

July Cook-Off 2014

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

February Challenge 2014

Little Elephant and Movies, Draughts, Make Him Happy, Chef and Favourite Sequence, Graph Challenge, Count on a Treap, Longest Common Pattern, Little Elephant and Subarrays, Colored Array, Make It Zero 2

March Challenge 2014

Team Split, Binary Tournament, Walk, Maximum number, GCD condition, Little Chef and Numbers, Mike and Stamps, Chef and Graph Queries

July Challenge 2014

Little Elephant and Painting, Garden Game, Chef and Frogs, Sereja and Equality, Chef and Rectangle Genome, Count Substrings, Reach The Point, Dish Owner, Lucky Game, Game of Numbers

August Challenge 2014

Mountain Holidays 2, Sereja and Shuffling, Little Elephant and T-Shirts, Chef and Reversing, Team Sigma and Fibonacci, The Leaking Robot, Push the Flow!, Earthquake, Cleaning Tables, Chef and Gift

December Challenge 2014

Chef Under Pressure, Chef and Bracket-Pairs, XOR with Subset, Chef and Apple Trees, Sereja and GCD

January Challenge 2015

Queries on the String, Sereja and Number Division 2, Chef and A Large Permutation, Sereja and LCM, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Xor Queries, Ranka, Gcd Queries

April Challenge 2015

Count Sequences, Chef and Array, Chef and Interview, Broken Telephone, Inversion sorting, Division of Lands, Chef and Piano Scales, Little Party, Black-white Board Game, Devus and their voting system

May Challenge 2015

Devu and his three Hands, Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Balanced Strings, Shopping, Chef and Cake, Counting on a directed graph, Special Economic Zone

June Challenge 2015

Sereja and Matrix Division, Steady tables, Chef and His Friend, Chef and Memory Limit, Chef and Polygons, Another Fibonacci, Anticommutative implication, Chef and String, Chefbook, Connect Points

July Challenge 2015

Addition and Multiplication, Na2a and lucky stone

September Challenge 2015

Filling the maze, 3D Queries, Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix, Terrible vectors, Bank robbery, Lighthouses, Cracking the Code, Chef and Chetris

December Challenge 2015

Sereja and Dividing, Chef and cinema, Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Misha and Permutation, Chef and Filters, Chef and Girls, Trip and Palindromes

May Cook-Off 2015

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

August Cook-Off 2015

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

September Mega Cook-Off 2015

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

November Cook-Off 2015

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

December Cook-Off 2015

Chef and Subarrays, Chef and Queries, Chef and LCS, Chef and Tree, Chef and Vectors

January Long Challenge 2016

Sereja and Salesman, Chef and Inflation, Rupsa and the Game, Churu and Balls, Chef and Making Triples, Asteroids, Cyclist Race, Dai Ma Chu Shi, Chef and Time Machine, Devu and Perfume

March Challenge 2016

Sereja and Two Strings 2, Polygon & Circles, Chef And Hungry Birds, Palindromic substrings, Floor Distribution, Chef and Number Guessing, maximize the sum, Parity tree, Chef And Special Dishes, Tiptoe through the tulips

September Challenge 2016

Chef and Friends, Dividing Machine, Chef and Matrix Division, Chef and digits of a number, Faded Palindromes, The New Restaurant, JosephLand, Chef and calculation, Chef and Cut

February Cook-Off 2016

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

June Cook-Off 2016

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

May Challenge 2017

Chef and Sub Array , Long Sandwich , Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences, Chef and Battleship, Painting Tree

June Challenge 2017

Chef and Prime Queries, A Good Set, Cloning, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets

September Challenge 2017

Sereja and Commands, Sereja and Functions (Challenge), Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Querying on a Grid, Weasel does Xor on Tree, Weasel finds Staircase, Fill The Matrix, Little Chef and Sums

November Challenge 2017

Product on the segment by modulo , Chef Hates Palindromes, Polynomials, Chef and Subarray Queries, Chef goes Left Right Left, Lovers Gift, Periodic Palindrome Construction, Villages and Tribes

December Challenge 2017

Chef and Direction, Chef and Universe, Total Diamonds, Santa Delivering Problem, Chef And his Cake, Chef, Leonardo And Queries, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays

June Cook-Off 2017

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

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

April Challenge 2018 Division 1

Vaibhav and Ministers, Chef at the Food Fair, Cutting Plants, Highway Crossing, Chef and Same Old Recurrence, Count Good Prefixes, Chef and Same Old Recurrence 2

June Challenge 2018 Division 1

Two Flowers, Vision, Ways to Work, Expected Buildings, Archi and Tree, Binary Board

July Challenge 2018 Division 1

Pizza Delivery, Tom and Jerry, Reach Equilibrium, Subway Ride, No Minimum No Maximum, Gears

August Challenge 2018 Division 1

Coordinate Compression , Modular GCD, Princess and Dragons, Chef in a Mysterious Land (Challenge), Safe Partition, Interactive Matrix, Chef at the River, Lonely Cycles

November Challenge 2018 Division 1

Chef and Recipes, Chef and Equations, Max-digit Tree, Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Magician versus Chef 2, Binary Strings

October Challenge 2018 Division 1

Walk on Tree, Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Coprime Components, Distinct Rows in Submatrices

January Challenge 2019 Division 1

Yet Another Problem About Sequences, Different Neighbours, Partition the Graph, Distinct Pairs, Maximum Distance, Party, (Challenge) Chef and Matching Game, A Pizza Slice

February Challenge 2019 Division 1

Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Xor Decomposition, Yet Another Tree Problem, (Challenge) Chef with Orchestra in the Kitchen, Art of Balance, Maximize the Tax

March Challenge 2019 Division 1

Chef and Soccer, Cheating on Queue, Sonya and Tree, Perfect Tree Problem, Treasure Hunt, Yet Again a Subarray Problem, Matchable Permutations, (Challenge) Interleaving Strings

July Challenge 2019 Division 1

Hit the Coconuts, Snake and Apple Tree, Guess the Prime!, Codechef War, LOVEMUFFIN, Maximum and Minimum, Circular Merging, (Challenge) Codechef War II

November Challenge 2019 Division 1

Physical Exercise, Smallest Beautiful Number, From Zero to Infinity, Single Point of Failure, Winning Ways, Pretty Boxes, (Challenge) Coloring Triangulations, D-Dart

December Challenge 2019 Division 1

Chefina and Ranges, Binary XOR, Binomial Fever, Scoring Pairs, Sticky Notes, Test Generation, (Challenge) Cubical Virus, Addition

April Challenge 2020 Division 1

Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Factor Tree, A Leisurely Journey, Line Line Line Graph, Leaked Answers (Challenge)

May Challenge 2020 Division 1

Buying a New String, Triple Sort, Binary Land, Sorting Vases, Not a Real World Problem, Chef and Rainbow Road, Chef and Bitwise Product, (Challenge) Nanobots, Precise Pairing, Precise Bipartite Pairing

October Challenge 2020 Division 1

Inversions, Positive AND, Random Knapsack, Rooted Minimum Spanning Tree, Replace for X, D-Dimensional MST, Compress all Subsegments, Adding Squares, Village Road Network

December Challenge 2020 Division 1

Hail XOR, Square Root of LCA Convolution, Calculus, Linear Combination, Permutations, Digit Matrix, String Operations, Palindromic Equivalence, Positive Prefixes, Even Pair Sum

SnackDown 2021 - Online Qualifiers

Lucky Number, Maximum Number Of Distinct Elements

SnackDown 2021 - Online Round 1A

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

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