mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
21 KiB
JSON
174 lines
21 KiB
JSON
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"title": "Alternating Groups II",
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"content": "<p>There is a circle of red and blue tiles. You are given an array of integers <code>colors</code> and an integer <code>k</code>. The color of tile <code>i</code> is represented by <code>colors[i]</code>:</p>\n\n<ul>\n\t<li><code>colors[i] == 0</code> means that tile <code>i</code> is <strong>red</strong>.</li>\n\t<li><code>colors[i] == 1</code> means that tile <code>i</code> is <strong>blue</strong>.</li>\n</ul>\n\n<p>An <strong>alternating</strong> group is every <code>k</code> contiguous tiles in the circle with <strong>alternating</strong> colors (each tile in the group except the first and last one has a different color from its <strong>left</strong> and <strong>right</strong> tiles).</p>\n\n<p>Return the number of <strong>alternating</strong> groups.</p>\n\n<p><strong>Note</strong> that since <code>colors</code> represents a <strong>circle</strong>, the <strong>first</strong> and the <strong>last</strong> tiles are considered to be next to each other.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">colors = [0,1,0,1,0], k = 3</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><strong><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/06/19/screenshot-2024-05-28-183519.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /></strong></p>\n\n<p>Alternating groups:</p>\n\n<p><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/05/28/screenshot-2024-05-28-182448.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/05/28/screenshot-2024-05-28-182844.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/05/28/screenshot-2024-05-28-183057.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /></p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">colors = [0,1,0,0,1,0,1], k = 6</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><strong><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/06/19/screenshot-2024-05-28-183907.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /></strong></p>\n\n<p>Alternating groups:</p>\n\n<p><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/06/19/screenshot-2024-05-28-184128.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/06/19/screenshot-2024-05-28-184240.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /></p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">colors = [1,1,0,1], k = 4</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><img alt=\"\" data-darkreader-inline-bgcolor=\"\" data-darkreader-inline-bgimage=\"\" src=\"https://assets.leetcode.com/uploads/2024/06/19/screenshot-2024-05-28-184516.png\" style=\"width: 150px; height: 150px; padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; --darkreader-inline-bgimage: initial; --darkreader-inline-bgcolor: #181a1b;\" /></p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 <= colors.length <= 10<sup>5</sup></code></li>\n\t<li><code>0 <= colors[i] <= 1</code></li>\n\t<li><code>3 <= k <= colors.length</code></li>\n</ul>\n",
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"Try to find a tile that has the same color as its next tile (if it exists).",
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"Then try to find maximal alternating groups by starting a single for loop from that tile."
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