The 2018 North Central North America ACM-ICPC Regional Programming Contest is tomorrow, Saturday November 3rd, 4pm UTC. There is an open division for anyone interested in competing at: https://open.kattis.com/contests/ncna18open. The official scoreboard will be at https://ncna18.kattis.com/.

As there is no way to request or issue clarifications in the open division of Kattis, please comment here if any questions arise.

The problem set was created by myself, Alexander Scheel, xennygrimmato, NibNalin, vlyubin, Joshua Guerin, Kathleen Ericson, David Poplawski, and erena. Additional thanks to asdoc, xiaowuc1, and y0105w49 for problem solutions.