June Challenge 2014
Guessing Game, Chef and Subarray, Forgot Password
June Challenge 2017
Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets
August Long Challenge 2017
Palindromic Game, Greedy Candidates, Chef and Mover, Chef And Fibonacci Array, Chef and Rainbow Array
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
August Cook-Off 2017
Matrix and Chef, Real obtuse, From heaven to earth
June Lunchtime 2017
Maximum Unique Segment, Two Numbers
July Lunchtime 2017
Find the Maximum Value, Good Pairs
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
January Lunchtime 2018
Chef and Game with Sequence, Chef and Escaping from the Labyrinth
February Challenge 2018
Broken Clock, Permutation and Palindrome, Car-pal Tunnel, Points Inside A Polygon, Chef and odd queries, Chef And The Patents, Chef And His Characters
March Challenge 2018 DIV 1
Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting
Colombia