LeetCode: Keys And Rooms Solution

1/**
2 * @param {number[][]} rooms
3 * @return {boolean}
4 */
5var canVisitAllRooms = function (rooms) {
6  const N = rooms.length
7  const visited = Array(N).fill(false)
8
9  const dfs = roomIndex => {
10    if (visited[roomIndex]) {
11      return
12    }
13    visited[roomIndex] = true
14    for (const roomKey of rooms[roomIndex]) {
15      dfs(roomKey)
16    }
17  }
18
19  dfs(0)
20
21  return visited.filter(Boolean).length === N
22}