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Solve 841. Keys and Rooms

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	`1`	`+class Solution {`
	`2`	`+`
	`3`	`+ fun canVisitAllRooms(rooms: List<List<Int>>): Boolean {`
	`4`	`+ val visited = mutableSetOf<Int>()`
	`5`	`+ visit(rooms, visited, 0)`
	`6`	`+`
	`7`	`+ return visited.size == rooms.size`
	`8`	`+ }`
	`9`	`+`
	`10`	`+ private fun visit(rooms: List<List<Int>>, visited: MutableSet<Int>, room: Int) {`
	`11`	`+ visited.add(room)`
	`12`	`+ rooms[room].forEach { nextRoom ->`
	`13`	`+ if (!visited.contains(nextRoom)) {`
	`14`	`+ visit(rooms, visited, nextRoom)`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+ }`
	`18`	`+`
	`19`	`+}`

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