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Practice: 

Observing the Tree, Gangsters of Treeland, Division of Lands, Counting on a directed graph, Fusing Weapons , Minimax, Racing Refuels, Year 3017, Election Bait, K-th Lexicographical Suffix

June Challenge 2013: 

Collecting Magical Berries, Just Some Permutations 3, Dessert Wizard, Two k-Convex Polygons, Count Special Matrices, Predictopus, To challenge or not, W String, Lapindromes, Little Elephant and Mouses

December Challenge 2013: 

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

January Challenge 2014: 

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

April Challenge 2014: 

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

May Challenge 2014: 

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

May Lunchtime 2014: 

Approximately II, Brand New Game, Roots of a Tree

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

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