Package g0601_0700.s0672_bulb_switcher_ii

Class Solution

java.lang.Object
g0601_0700.s0672_bulb_switcher_ii.Solution
public class Solution extends Object
672 - Bulb Switcher II.<p>Medium</p> <p>There is a room with <code>n</code> bulbs labeled from <code>1</code> to <code>n</code> that all are turned on initially, and <strong>four buttons</strong> on the wall. Each of the four buttons has a different functionality where:</p> <ul> <li><strong>Button 1:</strong> Flips the status of all the bulbs.</li> <li><strong>Button 2:</strong> Flips the status of all the bulbs with even labels (i.e., <code>2, 4, ...</code>).</li> <li><strong>Button 3:</strong> Flips the status of all the bulbs with odd labels (i.e., <code>1, 3, ...</code>).</li> <li><strong>Button 4:</strong> Flips the status of all the bulbs with a label <code>j = 3k + 1</code> where <code>k = 0, 1, 2, ...</code> (i.e., <code>1, 4, 7, 10, ...</code>).</li> </ul> <p>You must make <strong>exactly</strong> <code>presses</code> button presses in total. For each press, you may pick <strong>any</strong> of the four buttons to press.</p> <p>Given the two integers <code>n</code> and <code>presses</code>, return <em>the number of <strong>different possible statuses</strong> after performing all</em> <code>presses</code> <em>button presses</em>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> n = 1, presses = 1</p> <p><strong>Output:</strong> 2</p> <p><strong>Explanation:</strong> Status can be:</p> <ul> <li> <p>[off] by pressing button 1</p> </li> <li> <p>[on] by pressing button 2</p> </li> </ul> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> n = 2, presses = 1</p> <p><strong>Output:</strong> 3</p> <p><strong>Explanation:</strong> Status can be:</p> <ul> <li> <p>[off, off] by pressing button 1</p> </li> <li> <p>[on, off] by pressing button 2</p> </li> <li> <p>[off, on] by pressing button 3</p> </li> </ul> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> n = 3, presses = 1</p> <p><strong>Output:</strong> 4</p> <p><strong>Explanation:</strong> Status can be:</p> <ul> <li> <p>[off, off, off] by pressing button 1</p> </li> <li> <p>[off, on, off] by pressing button 2</p> </li> <li> <p>[on, off, on] by pressing button 3</p> </li> <li> <p>[off, on, on] by pressing button 4</p> </li> </ul> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= n <= 1000</code></li> <li><code>0 <= presses <= 1000</code></li> </ul>

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • flipLights

      public int flipLights(int n, int m)