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g0601_0700.s0672_bulb_switcher_ii.readme.md Maven / Gradle / Ivy

672\. Bulb Switcher II

Medium

There is a room with `n` bulbs labeled from `1` to `n` that all are turned on initially, and **four buttons** on the wall. Each of the four buttons has a different functionality where:

*   **Button 1:** Flips the status of all the bulbs.
*   **Button 2:** Flips the status of all the bulbs with even labels (i.e., `2, 4, ...`).
*   **Button 3:** Flips the status of all the bulbs with odd labels (i.e., `1, 3, ...`).
*   **Button 4:** Flips the status of all the bulbs with a label `j = 3k + 1` where `k = 0, 1, 2, ...` (i.e., `1, 4, 7, 10, ...`).

You must make **exactly** `presses` button presses in total. For each press, you may pick **any** of the four buttons to press.

Given the two integers `n` and `presses`, return _the number of **different possible statuses** after performing all_ `presses` _button presses_.

**Example 1:**

**Input:** n = 1, presses = 1

**Output:** 2

**Explanation:** Status can be: 

- [off] by pressing button 1 

- [on] by pressing button 2

**Example 2:**

**Input:** n = 2, presses = 1

**Output:** 3

**Explanation:** Status can be: 

- [off, off] by pressing button 1 

- [on, off] by pressing button 2 

- [off, on] by pressing button 3

**Example 3:**

**Input:** n = 3, presses = 1

**Output:** 4

**Explanation:** Status can be: 

- [off, off, off] by pressing button 1 

- [off, on, off] by pressing button 2 

- [on, off, on] by pressing button 3 

- [off, on, on] by pressing button 4

**Constraints:**

*   `1 <= n <= 1000`
*   `0 <= presses <= 1000`