September Challenge 2016
Dividing Machine, Chef and Friends, Chef and calculation, Faded Palindromes, Chef and Matrix Division, Chef and digits of a number
October Challenge 2016
Chef and Keyboard, Big Queries, Chef and Three Dogs
November Challenge 2016
Count Permutations, Friends Meeting, Urban Development, Gift and Chef, Chef and squares, Task for Alexey
March Challenge 2018 DIV 1
Pishty and Triangles, Minions and Voting, Mix the Colors, Chef and Gcd Queries, Chef and Easy Problem
March Cook-off 2018 Division 1
Chef Goes to the Cinema, Chef Restores an Array, Chef Restores a Matrix
April Challenge 2018 Division 1
Chef and Same Old Recurrence 2, Count Good Prefixes, Chef and Same Old Recurrence, Highway Crossing, Vaibhav and Ministers, Chef and Array (Challenge), Cutting Plants
May Challenge 2018 Division 1
S-T Mincut, Change the Signs, Edges in Spanning Trees, Not a Convex Hull (Challenge), Fake Binary Search, Dibs on Fibs
June Challenge 2018 Division 1
Archi and Tree, Expected Buildings, Ways to Work, Vision, Two Flowers
October Challenge 2019 Division 1
Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Fun with Lists, Array Modification
November Cook-Off 2021 Division 1
Non-Decreasing Subsequence of size K, Product Pain, Guests like slippers, Guess the row
December Lunchtime 2021 Division 1
Optimal Sorting, Romantic Reversals, Sleep Technique
Japan