Bulb Switcher II

Similar Problems:

There is a room with n lights which are turned on initially and 4 buttons on the wall. After performing exactly m unknown operations towards buttons, you need to return how many different kinds of status of the n lights could be.

Suppose n lights are labeled as number [1, 2, 3 …, n], function of these 4 buttons are given below:

Flip all the lights.

Flip lights with even numbers.

Flip lights with odd numbers.

Flip lights with (3k + 1) numbers, k = 0, 1, 2, …

Example 1:

Input: n = 1, m = 1. Output: 2 Explanation: Status can be: [on], [off]

Example 2:

Input: n = 2, m = 1. Output: 3 Explanation: Status can be: [on, off], [off, on], [off, off]

Example 3:

Input: n = 3, m = 1. Output: 4 Explanation: Status can be: [off, on, off], [on, off, on], [off, off, off], [off, on, on].

Note: n and m both fit in range [0, 1000].

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.

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