Rooms with Two Incoming Edges to Treasure

Given directed room instructions and treasure rooms, return rooms with at least two incoming rooms that also point directly to a treasure room. Requirements Input: string[][] instructions_room, string[] treasure_rooms. Each instruction pair such as [a, b] means room a points to room b. Treasure rooms also appear in the instruction-room data and the treasure list can be empty. Output: List<String> of rooms that satisfy both conditions: at least two rooms point to it; it points to a treasure room. A hashmap-based solution is expected; union-find is unnecessary. Notes Build an indegree map and an outgoing-neighbor map. The statement can sound more complex than it is; reduce it to direct incoming count plus direct outgoing-to-treasure membership.