Yanfeng Zhao

May Challenge 2012: 

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

June Challenge 2012: 

Little Elephant and Candies, 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, Range of Data, Delivery Boy

September Challenge 2012: 

Lights, Kisses & Hugs, Racing Horses, Queries About Numbers, Three is Crowd

October Challenge 2012: 

Fierce Battles, Event Organizer, The New Scheme

November Challenge 2012: 

A Wonderful Chocolate, Delicious Dishes, Candy Collecting Game, Coin Flip, Sridhar Likes Travelling

December Challenge 2012: 

Sereja and Data Structures , Granama Recipes, Book Exercises, Magic Rankings, The Uncountable Ways, Pizza Delivery

January Challenge 2013: 

Little Elephant and Alcohol, Dividing Products, The Minimum Number Of Moves, End Of The World, A Fence for Byteland, Chef of the Year, Three Different Numbers

February 2013 Challenge: 

Buy1-Get1, Magic Board

March Challenge 2013: 

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

April Challenge 2013: 

Little Elephant and Music, Barcelona Gameplay Tactics, ChefGame, Kingdom Unity, Maximum Weight Difference, Levy Conjecture

May Challenge 2013: 

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

June Challenge 2013: 

Dessert Wizard, Predictopus, Lapindromes

December Challenge 2013: 

Lucy and the Flowers, Art in Digital Age, Cube Cakes, Chef and Codes, Petya and Sequence, Funny Marbles, Magic Pairs, Reign, Rectangular Queries, Query on a tree VI

January Challenge 2014: 

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

February Challenge 2014: 

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

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, Chef and Graph Queries

April Challenge 2014: 

Final Battle of Chef, 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, Guessing Game, Forgot Password

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

September Challenge 2014: 

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

CodeX 2014: 

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

Code Mutants 2014: 

Mirror Image, Cinema Tickets, Easy Tiling, Really Easy Tiling

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