package q841

func canVisitAllRooms(rooms [][]int) bool {
	locked := len(rooms) - 1

	opened := make([]bool, len(rooms))
	opened[0] = true

	queue := []int{0}
	for ; len(queue) > 0; queue = queue[1:] {
		for _, i := range rooms[queue[0]] {
			if opened[i] {
				continue
			}
			opened[i] = true
			locked--
			queue = append(queue, i)
		}
	}
	return locked == 0
}

var _ = canVisitAllRooms