Home › Forums › IPT2017 › Problems This forum has 1 topic, and was last updated 7 years ago by Dmytro Oliinychenko. Viewing topic 1 (of 1 total) Topic Voices Posts Last Post The tallest sand castle problem (IPT 2013) Started by: Dmytro Oliinychenko 1 1 7 years ago Dmytro Oliinychenko Viewing topic 1 (of 1 total) You must be logged in to create new topics. Log In Username: Password: Keep me signed in nine − = Log In