November Challenge 2014
Chef and Words, Chef and Segment Game, The Spelling Problem, Chef and Churu, Let us construct palindrome, Chef and Red Black Tree, Distinct Characters Subsequence, Sereja and Permutations, Sereja and Order, Fombinatorial
April LunchTime 2014
Minimum Product, Knight Fork, Tracy and Charlie
February Challenge 2015
Devu and Locks, Chef and Equality, Xor Matrix, Let us play with rank list, Chef and Strange Formula, Time to Study Graphs with Chef, Chef and Chain, Chef and Strings
March Challenge 2015
Count Substrings, Chef and Notebooks, Chef and Problems, Random Number Generator, Devu and his Class, Sign Wave, Matrix
June Challenge 2015
Chef and His Friend, Chef and Polygons, Chef and Memory Limit, Steady tables
July Challenge 2015
Addition and Multiplication, Sereja and Game 2, Bread, A game on a graph, MasterChef, Na2a and lucky stone, Chef and Cube, Rohith and Circles, Easy exam
China