December Challenge 2014
Alok-nath and His Sanskars, XOR with Subset, Chef and Apple Trees
January Challenge 2015
Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
August Cook-Off 2015
Chef and the Wildcard Matching, Chef and the XORed Number
September Mega Cook-Off 2015
Forgotten Language, Stacks
September Cook-Off 2016
Lazy Jem, The Lost Arithmetic Sequences
October Cook-Off 2016
Watson asks Does Permutation Exist, ChefWatson uses Social Network
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
Bangladesh