Chen Jiyuan

Practice: 

Dynamic GCD, Substrings on a Tree, Ciel and a new island, Addition chains, Different Trips, Tree Counting, Vacation, Sereja and Equality, Sereja and Arcs, Lucky Game, Game of Numbers, Xor Queries, Filling the maze, Evaluate the polynomial, Calculus, An Interesting Sequence, Dual Distance, Round Robin Ranks , Dance Moves, Min Max LCM

November 2010 Challenge: 

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

December 2010 Challenge: 

Delivering Bread, The Hungry Bear, Odd Binomial Coefficients, Byteknights and Byteknaves, A String Game

March 2011 Challenge: 

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

May Long Contest 2011: 

Pruning Trees, Tree Product, The Great Wall of Byteland, Bickering Cooks

July 2011 Long Contest: 

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

August Long Contest 2011: 

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

November Long Contest 2011: 

Chefs new Pet, New Restaurant, The Postal Service, Stepping Average

December 2011 Long Contest: 

Birthday Gift, Robot Movings, Ciel and Eggs, Spinning Wheels

January 2012 Challenge: 

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

February 2012 Challenge: 

Lucky Count, Lucky Long, Word Couting, Count of Maximum

February 2012 Cook-off: 

Daily Train

March 2012 Challenge: 

Longest Weird Subsequence, Lucky Number, Free Shuttle Service, Home Delivery, Spoon in Matrix

March Cook-Off 2012: 

Ciel Numbers I, Ciel Numbers II

April Challenge 2012: 

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

June Challenge 2012: 

Polynomial Partition Function, Little Elephant and Product, Little Elephant and Candies, Doom Bakes Cakes, Arranging Cup-cakes

July Challenge 2012: 

Favourite Numbers, Chef's Dream, My Fair Coins, The Gray-Similar Code, Little Elephant and Bubble Sort, Gift Rift, Restaurant Rating

August Challenge 2012: 

Little Elephant and Bombs, Lucky Driving, Block Game, Range of Data, Delivery Boy, Machine Gun

July Cook-Off 2012: 

Ciel and Receipt, Ciel and Map, Ciel and Tomya

September Challenge 2012: 

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

October Challenge 2012: 

Little Elephant and Order, Fierce Battles, Event Organizer, Maximum Sub-rectangle in Matrix, Blade Master, The New Scheme, Need More Diamonds

December Challenge 2012: 

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

February 2013 Challenge: 

Little Elephant and Cards, Buy1-Get1, Magic Board, Triangular Queries, Climbing Stairs, Word Play, Efficient Painting

March Challenge 2013: 

Random decreasing function, Tourist Translations, Approximately, Fire Escape Routes, Minesweeper

May Challenge 2013: 

Matchsticks, Witua and Math, Password Cracking Challenge, Juno Puzzle for May, Name Reduction, Your Name is Mine, Field Trip

January Challenge 2014: 

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

March Challenge 2014: 

Sereja and Sorting 2, Team Split, Binary Tournament, Walk, Maximum number, GCD condition, The Street , Little Chef and Numbers, Mike and Stamps, A Story with Strings

April Challenge 2014: 

Sereja and Permutation, Counting Matrices, Farmer Feb, Cards, bags and coins, Chef and Digits, Divide the Tangerine, Shortest Path in Binary Trees

May Challenge 2014: 

Little Elephant and Balloons, Sereja and Game, Compilers and parsers, Chef-jumping, Fun with AGp, Chef and Strange Matrix, Stone

June Challenge 2014: 

Little Elephant and Blocks, Maxim and Progressions, Chef and Functions, Chef and Digit Jumps, Chef and Subarray, Two Companies, Guessing Game, Forgot Password

July Challenge 2014: 

Little Elephant and Painting, Garden Game, Chef and Frogs, Chef and Rectangle Genome, Count Substrings, Reach The Point, Dish Owner

September Challenge 2014: 

Factorisation, Chef and Rainbow Array - 2, Chef and Swaps, Chef and Left-Right, Chef and sequence, Fun with Rotation, Flooring

November Challenge 2014: 

Chef and Segment Game, Chef and Words, Fombinatorial, Sereja and Permutations, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, Chef and Churu, The Spelling Problem

December Challenge 2014: 

XOR with Subset, Chef and Apple Trees

January Challenge 2015: 

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

April Challenge 2015: 

Count Sequences, Chef and Array, Chef and Interview, Broken Telephone, Inversion sorting, Division of Lands, Chef and Piano Scales

September Challenge 2015: 

Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix, Bank robbery, Lighthouses, Cracking the Code

December Challenge 2015: 

Chef and cinema, Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Chef and Filters, Chef and Girls, Tanks

April Challenge 2016: 

Amazing Experiment, Help Watson Escape, Fibonacci Queries, Chef and Ballons, Devu and good strings, Chef And Magical Path, Chef And Coloring, Game of snakes on a grid

May Challenge 2016: 

Sereja and GCD 2, Easy Queries, Chef and math, Chef and Balls, Forest Gathering, Chef and Amazingness of Numbers, Chef and Big Soccer, Laddu

July Challenge 2016: 

Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and special numbers, Chef and Robots Competition, Chefland and Electricity, Scheduling jobs on a cluster

August Challenge 2016: 

Chef and His Garden, Fighting Ebola, Chef and Circle Run, Chef and Chocolate, Chef and Round Run, Funny gnomes, Maximum Grid

September Challenge 2016: 

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

April Challenge 2017: 

Chef and Divisor Tree, Dish Of Life, Bear and Row 01, Bear and Clique Distances, Similar Dishes

January Lunchtime 2018: 

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

February Challenge 2018: 

Broken Clock, Lucas Theorem, Chef And Land Labeling, Chef And His Characters, Chef And The Patents, Chef and odd queries, Points Inside A Polygon, Car-pal Tunnel, (Challenge) Biased Committee, Permutation and Palindrome

December Challenge 2018 Division 1: 

(Challenge) Delete DAG, Max and Electrical Panel, Directing Edges, Chef and Interactive XOR

January Challenge 2019 Division 1: 

Yet Another Problem About Sequences, Different Neighbours, Distinct Pairs, A Pizza Slice

April Challenge 2020 Division 1: 

Strange Number, Squared Subsequences, Ready Bitwise, Leaked Answers (Challenge)

December Challenge 2020 Division 1: 

Hail XOR, Positive Prefixes, Even Pair Sum

March Challenge 2021 Division 2: 

Interesting XOR!, College Life 4, Consecutive Adding, Paparazzi Gennady, Space Arrays, Maximum Topological Sort

May Challenge 2021 Division 2 (Rated): 

Valid Paths, Tree House, Xor Equality, Tic Tac Toe, Modular Equation

June Challenge 2021 Division 2 (Unrated): 

Minimum Dual Area, Shortest Route, Bitwise Tuples, Bella ciao, Summer Heat, Optimal Xor Set, Minimum Subtree Cover

SnackDown 2021 - Online Qualifiers: 

Lucky Number

SnackDown 2021 - Online Round 1B: 

Queens Placement , Largest Laddu, Help Nishant

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