July 2011 Long Contest
A-E Hash Function, Most Popular Friend, Large Kitchen
December Cook-Off
Ciel and New Menu, Ciel and A-B Problem
July Cook-Off 2012
Ciel and Tomya, Ciel and Map, Ciel and Receipt
August Cook-Off 2012
Forced Output, Code Crazy Minions
October Cook-Off 2012
Buying Sweets, Tennis Tournament
March Challenge 2017
Xenny and Alternating Tasks, Pishty and birthday, Bear and Extra Number, Bandwidth of a matrix
