May Challenge 2012
Lucky lucky number, Jewels and Stones
May Challenge 2013
Witua and Math, Name Reduction, Your Name is Mine
August Challenge 2013
Little Elephant and Lemonade, Splitting Candies
August Cook-Off 2013
Chef and The Right Triangles
November Challenge 2014
Distinct Characters Subsequence
June Challenge 2015
Chef and Memory Limit, Chef and Polygons
