leetcode-problemset/leetcode-cn/originData/QA2IGt.json

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            "questionId": "1000310",
            "questionFrontendId": "剑指 Offer II 113",
            "categoryTitle": "LCOF2",
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            "title": "课程顺序",
            "titleSlug": "QA2IGt",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
            "translatedTitle": "课程顺序",
            "translatedContent": "<p>现在总共有 <code>numCourses</code>&nbsp;门课需要选，记为&nbsp;<code>0</code>&nbsp;到&nbsp;<code>numCourses-1</code>。</p>\n\n<p>给定一个数组&nbsp;<code>prerequisites</code> ，它的每一个元素&nbsp;<code>prerequisites[i]</code>&nbsp;表示两门课程之间的先修顺序。&nbsp;例如&nbsp;<code>prerequisites[i] = [a<sub>i</sub>, b<sub>i</sub>]</code>&nbsp;表示想要学习课程 <code>a<sub>i</sub></code>&nbsp;，需要先完成课程 <code>b<sub>i</sub></code>&nbsp;。</p>\n\n<p>请根据给出的总课程数 &nbsp;<code>numCourses</code> 和表示先修顺序的&nbsp;<code>prerequisites</code>&nbsp;得出一个可行的修课序列。</p>\n\n<p>可能会有多个正确的顺序，只要任意返回一种就可以了。如果不可能完成所有课程，返回一个空数组。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例&nbsp;1:</strong></p>\n\n<pre>\n<strong>输入:</strong> numCourses = 2, prerequisites = [[1,0]] \n<strong>输出: </strong><code>[0,1]</code>\n<strong>解释:</strong>&nbsp;总共有 2 门课程。要学习课程 1，你需要先完成课程 0。因此，正确的课程顺序为 <code>[0,1] 。</code></pre>\n\n<p><strong>示例&nbsp;2:</strong></p>\n\n<pre>\n<strong>输入:</strong> numCourses = 4, prerequisites = [[1,0],[2,0],[3,1],[3,2]]\n<strong>输出: </strong><code>[0,1,2,3] or [0,2,1,3]</code>\n<strong>解释:</strong>&nbsp;总共有 4 门课程。要学习课程 3，你应该先完成课程 1 和课程 2。并且课程 1 和课程 2 都应该排在课程 0 之后。\n&nbsp;因此，一个正确的课程顺序是&nbsp;<code>[0,1,2,3]</code> 。另一个正确的排序是&nbsp;<code>[0,2,1,3]</code> 。\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong> numCourses = 1, prerequisites = [] \n<strong>输出: </strong><code>[0]</code>\n<strong>解释:</strong>&nbsp;总共 1 门课，直接修第一门课就可。</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= numCourses &lt;= 2000</code></li>\n\t<li><code>0 &lt;= prerequisites.length &lt;= numCourses * (numCourses - 1)</code></li>\n\t<li><code>prerequisites[i].length == 2</code></li>\n\t<li><code>0 &lt;= ai, bi &lt; numCourses</code></li>\n\t<li><code>ai != bi</code></li>\n\t<li><code>prerequisites</code>&nbsp;中不存在重复元素</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 210&nbsp;题相同：<a href=\"https://leetcode-cn.com/problems/course-schedule-ii/\">https://leetcode-cn.com/problems/course-schedule-ii/</a></p>\n",
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