Source: Day 23: LAN Party
Full solution for today (spoilers!).
Part 1
You are given the edges of an undirected graph. Count how many complete subgraphs of size three exist that contain one or more starting with the letter
t.
Aside: Games with local (but not hotseat) multiplayer have gotten rather rarer over the years… how many people still know what a LAN party is/was?