Class Solution
Medium
There are n
rooms you need to visit, labeled from 0
to n - 1
. Each day is labeled, starting from 0
. You will go in and visit one room a day.
Initially on day 0
, you visit room 0
. The order you visit the rooms for the coming days is determined by the following rules and a given 0-indexed array nextVisit
of length n
:
- Assuming that on a day, you visit room
i
, - if you have been in room
i
an odd number of times ( including the current visit), on the next day you will visit a room with a lower or equal room number specified bynextVisit[i]
where0 <= nextVisit[i] <= i
; - if you have been in room
i
an even number of times ( including the current visit), on the next day you will visit room(i + 1) mod n
.
Return the label of the first day where you have been in all the rooms. It can be shown that such a day exists. Since the answer may be very large, return it modulo 109 + 7
.
Example 1:
Input: nextVisit = [0,0]
Output: 2
Explanation:
- On day 0, you visit room 0. The total times you have been in room 0 is 1, which is odd.
On the next day you will visit room nextVisit[0] = 0
- On day 1, you visit room 0, The total times you have been in room 0 is 2, which is even.
On the next day you will visit room (0 + 1) mod 2 = 1
- On day 2, you visit room 1. This is the first day where you have been in all the rooms.
Example 2:
Input: nextVisit = [0,0,2]
Output: 6
Explanation:
Your room visiting order for each day is: [0,0,1,0,0,1,2,…].
Day 6 is the first day where you have been in all the rooms.
Example 3:
Input: nextVisit = [0,1,2,0]
Output: 6
Explanation:
Your room visiting order for each day is: [0,0,1,1,2,2,3,…].
Day 6 is the first day where you have been in all the rooms.
Constraints:
n == nextVisit.length
2 <= n <= 105
0 <= nextVisit[i] <= i
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Constructor Summary
Constructors -
Method Summary
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Constructor Details
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Solution
public Solution()
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Method Details
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firstDayBeenInAllRooms
public int firstDayBeenInAllRooms(int[] nextVisit)
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