July Cook-Off 2017
Chang and the Perfect Function, Chang and Perfect Quadruples, Chang and Bitwise OR
August Cook-Off 2017
Matrix and Chef, Real obtuse, From heaven to earth
September Cook-Off 2017
Infinite OR Game, Statistics Construction, Subsequence Equality
October Lunchtime 2017
Buggy Calculator, Maximum Number
January Challenge 2019 Division 1
Different Neighbours, A Pizza Slice, Distinct Pairs, Lucky Number Game, Yet Another Problem About Sequences
March Challenge 2019 Division 1
Chef and Soccer, Cheating on Queue, Yet Again a Subarray Problem
April Challenge 2019 Division 1
Offer for Chef, Kira Loves Palindromes, Playing with Numbers, Maximum Remaining, Subtree Removal
Vietnam