mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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190 lines
17 KiB
JSON
190 lines
17 KiB
JSON
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"title": "Bulb Switcher II",
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"content": "<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>\n\n<ul>\n\t<li><strong>Button 1:</strong> Flips the status of all the bulbs.</li>\n\t<li><strong>Button 2:</strong> Flips the status of all the bulbs with even labels (i.e., <code>2, 4, ...</code>).</li>\n\t<li><strong>Button 3:</strong> Flips the status of all the bulbs with odd labels (i.e., <code>1, 3, ...</code>).</li>\n\t<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>\n</ul>\n\n<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>\n\n<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>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1, presses = 1\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> Status can be:\n- [off] by pressing button 1\n- [on] by pressing button 2\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2, presses = 1\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> Status can be:\n- [off, off] by pressing button 1\n- [on, off] by pressing button 2\n- [off, on] by pressing button 3\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, presses = 1\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> Status can be:\n- [off, off, off] by pressing button 1\n- [off, on, off] by pressing button 2\n- [on, off, on] by pressing button 3\n- [off, on, on] by pressing button 4\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 1000</code></li>\n\t<li><code>0 <= presses <= 1000</code></li>\n</ul>\n",
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