February 2012 Challenge
Lucky Long, Count of Maximum
May Challenge 2012
Jewels and Stones, Lucky lucky number
April Challenge 2013
Barcelona Gameplay Tactics, Maximum Weight Difference, Levy Conjecture
January Challenge 2014
Please like me, Chef and Feedback
April Challenge 2014
Counting Matrices, Shortest Path in Binary Trees, Chef and Digits, Farmer Feb
June Challenge 2014
Chef and Digit Jumps, Chef and Subarray, Guessing Game, Forgot Password
July Challenge 2014
Chef and Frogs, Count Substrings, Reach The Point
August Challenge 2014
Chef and Gift, The Leaking Robot
September Challenge 2014
Chef and Rainbow Array - 2, Chef and Left-Right, Fun with Rotation
October Challenge 2014
Remy paints the fence, Chef and Ground, Chef and Square, Magical Girl and Colored Liquid Potions
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome
December Challenge 2014
Chef and Apple Trees, XOR with Subset
October Lunchtime 2014
Tanu and Head-bob, Physics Class, Cascading Style Sheets
January Challenge 2015
Chef and Stones, Sereja and Votes, Gcd Queries
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
June Challenge 2015
Chef and Memory Limit, Chef and Polygons
Mexico