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Practice: 

Arithmetic Progressions, Game, Queries With Points, Lucy and the Number Game

April Challenge 2013: 

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

July Challenge 2013: 

Mountain Holidays, Galactik Football, The Probability Of Winning, Chef and Walking on the rectangle , Count K-Primes, Circle of death

September Challenge 2013: 

Merciless Chef

November Challenge 2013: 

Gangsters of Treeland, Black and White Tree, Missing some chairs, Square Digit Squares, Uncle Johny, Yet Another Cute Girl, Superpowers of 2, Chef Game

December Challenge 2013: 

Query on a tree VI, Rectangular Queries, Reign, Magic Pairs, Chef and Codes, Cube Cakes, Lucy and the Flowers, Funny Marbles

January Challenge 2014: 

Chef and Feedback, Please like me, Bon Appetit, Meteor, ForbiddenSum, Sereja and Graph, Counting The Important Pairs, Magic Trick

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

March Challenge 2014: 

Little Chef and Numbers, Binary Tournament, Team Split, Walk

April Challenge 2014: 

Final Battle of Chef, Counting Matrices, Farmer Feb, Cards, bags and coins, Chef and Digits, Divide the Tangerine, Shortest Path in Binary Trees

May Challenge 2014: 

Compilers and parsers, Stone, Chef and Strange Matrix, Sereja and Subsegment Increasings, Fun with AGp, Chef-jumping, Dynamic Trees and Queries, Sereja and Game, Little Elephant and Balloons

June Challenge 2014: 

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

August Challenge 2014: 

Mountain Holidays 2, Little Elephant and T-Shirts, Chef and Reversing, The Leaking Robot, Earthquake, Cleaning Tables, Chef and Gift

September Challenge 2014: 

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

November Challenge 2014: 

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

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