October Challenge 2015
Time measure, Count Subarrays, Who dares to be a millionaire
September Lunchtime 2015
Sum of palindromic numbers
September Challenge 2016
Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Three Dogs, Fenwick Iterations, Chef and Keyboard
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number, Bandwidth of a matrix
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
India