September Lunchtime 2015
Sum of palindromic numbers
November Challenge 2016
Count Permutations, Friends Meeting, Gift and Chef, Chef and squares, Task for Alexey
February Challenge 2017
Most Frequent Element, Gerrymander, Chef and His Apartment Dues, Chef and his Best Friend, Chef and Triangles, Interval Game, Eugene and big number
March Challenge 2017
Cooking Schedule, Completing favorite game, Xenny and Alternating Tasks, Pishty and birthday, Bear and Extra Number, Bandwidth of a matrix
April Challenge 2017
Similar Dishes, Bear and Clique Distances, Bear and Row 01, Stable market, Dish Of Life, Chef and Digits, Chef and Divisor Tree
June Challenge 2017
Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
July Challenge 2017
Chef and Sign Sequences, Pishty and tree, Whats in the Name, Calculator , IPC Trainers, Two Coins
August Long Challenge 2017
Chef and Rainbow Array, Chef And Fibonacci Array
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
January Cook-Off 2018
Multiple of 3, Survive in ChocoLand
June Cook-Off 2020 Division 2
Cache Hits, Per Capita Income, Max Mex
April Cook-Off 2021 Division 2
OR of ANDs, Chocolate Monger
Bangladesh