Advent of Code - Day 3: Lobby

&#xA; &#xA; You descend a short staircase, enter the surprisingly vast lobby, and are quickly cleared by the security checkpoint. When you get to the main elevators, however, you discover that each one has a red light above it: they&rsquo;re all offline . &#xA; &ldquo;Sorry about that,&rdquo; an Elf apologizes as she tinkers with a nearby control panel. &ldquo;Some kind of electrical surge seems…