August Long Challenge 2017
Chef And Fibonacci Array, Chef and Mover, Palindromic Game, Greedy Candidates, Strings and Graphs, Chef and Rainbow Array
September Challenge 2017
Fill The Matrix, Little Chef and Sums, Weasel does Xor on Tree, Minimum Good Permutation, Chef and Pick Digit, Sereja and Commands
June Challenge 2019 Division 1
Chef and Proxy, Lent Money, Chef and Ingredients, Sum and GCD
October Challenge 2019 Division 1
Even Edges, Chef and Maximum Star Value, Array Modification
China