Grokking Graph Algorithms for Coding Interviews
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Solution: Keys and Rooms
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Problem Statement

You are given n rooms labeled from 0 to n-1. Initially, you can only enter inside the room 0, and all other rooms are locked. However, you cannot enter a locked room without having its key.

Each room may contain a set of keys, each key opens a specific room. Each key has a number n on it, which opens up n<sup>th</sup> room starting from 0, and you can take all of them with you to unlock the other rooms.

Given an array rooms where rooms[i] is the set of keys that you can obtain if you visited room i, return true if you can visit all the rooms

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