November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Let us construct palindrome
October Challenge 2015
Time measure, Count Subarrays, Who dares to be a millionaire, Spheres, Rupsa and Equilateral Triangle
September Lunchtime 2015
Sum of palindromic numbers
September Challenge 2017
Minimum Good Permutation, Little Chef and Sums, Fill The Matrix, Chef and Pick Digit, Sereja and Commands
May Challenge 2018 Division 2
S-T Mincut, Mighty Friend, Change the Signs, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs
August Challenge 2019 Division 1
Guddu and his Mother, Dilemma
September Challenge 2019 Division 1
Fuzzy Linear Combinations, Chef Designed a Network
Vietnam