mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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173 lines
17 KiB
JSON
173 lines
17 KiB
JSON
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"questionId": "1120",
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"title": "Flower Planting With No Adjacent",
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"content": "<p>You have <code>n</code> gardens, labeled from <code>1</code> to <code>n</code>, and an array <code>paths</code> where <code>paths[i] = [x<sub>i</sub>, y<sub>i</sub>]</code> describes a bidirectional path between garden <code>x<sub>i</sub></code> to garden <code>y<sub>i</sub></code>. In each garden, you want to plant one of 4 types of flowers.</p>\n\n<p>All gardens have <strong>at most 3</strong> paths coming into or leaving it.</p>\n\n<p>Your task is to choose a flower type for each garden such that, for any two gardens connected by a path, they have different types of flowers.</p>\n\n<p>Return <em><strong>any</strong> such a choice as an array </em><code>answer</code><em>, where </em><code>answer[i]</code><em> is the type of flower planted in the </em><code>(i+1)<sup>th</sup></code><em> garden. The flower types are denoted </em><code>1</code><em>, </em><code>2</code><em>, </em><code>3</code><em>, or </em><code>4</code><em>. It is guaranteed an answer exists.</em></p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, paths = [[1,2],[2,3],[3,1]]\n<strong>Output:</strong> [1,2,3]\n<strong>Explanation:</strong>\nGardens 1 and 2 have different types.\nGardens 2 and 3 have different types.\nGardens 3 and 1 have different types.\nHence, [1,2,3] is a valid answer. Other valid answers include [1,2,4], [1,4,2], and [3,2,1].\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 4, paths = [[1,2],[3,4]]\n<strong>Output:</strong> [1,2,1,2]\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 4, paths = [[1,2],[2,3],[3,4],[4,1],[1,3],[2,4]]\n<strong>Output:</strong> [1,2,3,4]\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= paths.length <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>paths[i].length == 2</code></li>\n\t<li><code>1 <= x<sub>i</sub>, y<sub>i</sub> <= n</code></li>\n\t<li><code>x<sub>i</sub> != y<sub>i</sub></code></li>\n\t<li>Every garden has <strong>at most 3</strong> paths coming into or leaving it.</li>\n</ul>\n",
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"code": "class Solution(object):\n def gardenNoAdj(self, n, paths):\n \"\"\"\n :type n: int\n :type paths: List[List[int]]\n :rtype: List[int]\n \"\"\"\n ",
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"Since each garden is connected to at most 3 gardens, there's always an available color for each garden. For example, if one garden is next to gardens with colors 1, 3, 4, then color #2 is available."
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