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107 lines
25 KiB
JSON
107 lines
25 KiB
JSON
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"title": "Find Students with Study Spiral Pattern",
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"titleSlug": "find-students-with-study-spiral-pattern",
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"content": "<p>Table: <code>students</code></p>\n\n<pre>\n+--------------+---------+\n| Column Name | Type |\n+--------------+---------+\n| student_id | int |\n| student_name | varchar |\n| major | varchar |\n+--------------+---------+\nstudent_id is the unique identifier for this table.\nEach row contains information about a student and their academic major.\n</pre>\n\n<p>Table: <code>study_sessions</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| session_id | int |\n| student_id | int |\n| subject | varchar |\n| session_date | date |\n| hours_studied | decimal |\n+---------------+---------+\nsession_id is the unique identifier for this table.\nEach row represents a study session by a student for a specific subject.\n</pre>\n\n<p>Write a solution to find students who follow the <strong>Study Spiral Pattern</strong> - students who consistently study multiple subjects in a rotating cycle.</p>\n\n<ul>\n\t<li>A Study Spiral Pattern means a student studies at least <code>3</code><strong> different subjects</strong> in a repeating sequence</li>\n\t<li>The pattern must repeat for <strong>at least </strong><code>2</code><strong> complete cycles</strong> (minimum <code>6</code> study sessions)</li>\n\t<li>Sessions must be <strong>consecutive dates</strong> with no gaps longer than <code>2</code> days between sessions</li>\n\t<li>Calculate the <strong>cycle length</strong> (number of different subjects in the pattern)</li>\n\t<li>Calculate the <strong>total study hours</strong> across all sessions in the pattern</li>\n\t<li>Only include students with cycle length of <strong>at least </strong><code>3</code><strong> subjects</strong></li>\n</ul>\n\n<p>Return <em>the result table ordered by cycle length in <strong>descending</strong> order, then by total study hours in <strong>descending</strong> order</em>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong></p>\n\n<p>students table:</p>\n\n<pre class=\"example-io\">\n+------------+--------------+------------------+\n| student_id | student_name | major |\n+------------+--------------+------------------+\n| 1 | Alice Chen | Computer Science |\n| 2 | Bob Johnson | Mathematics |\n| 3 | Carol Davis | Physics |\n| 4 | David Wilson | Chemistry |\n| 5 | Emma Brown | Biology |\n+------------+--------------+------------------+\n</pre>\n\n<p>study_sessions table:</p>\n\n<pre class=\"example-io\">\n+------------+------------+------------+--------------+---------------+\n| session_id | student_id | subject | session_date | hours_studied |\n+------------+------------+------------+--------------+---------------+\n| 1 | 1 | Math | 2023-10-01 | 2.5 |\n| 2 | 1 | Physics | 2023-10-02 | 3.0 |\n| 3 | 1 | Chemistry | 2023-10-03 | 2.0 |\n| 4 | 1 | Math | 2023-10-04 | 2.5 |\n| 5 | 1 | Physics | 2023-10-05 | 3.0 |\n| 6 | 1 | Chemistry | 2023-10-06 | 2.0 |\n| 7 | 2 | Algebra | 2023-10-01 | 4.0 |\n| 8 | 2 | Calculus | 2023-10-02 | 3.5 |\n| 9 | 2 | Statistics | 2023-10-03 | 2.5 |\n| 10 | 2 | Geometry | 2023-10-04 | 3.0 |\n| 11 | 2 | Algebra | 2023-10-05 | 4.0 |\n| 12 | 2 | Calculus | 2023-10-06 | 3.5 |\n| 13 | 2 | Statistics | 2023-10-07 | 2.5 |\n| 14 | 2 | Geometry | 2023-10-08 | 3.0 |\n| 15 | 3 | Biology | 2023-10-01 | 2.0 |\n| 16 | 3 | Chemistry | 2023-10-02 | 2.5 |\n| 17 | 3 | Biology | 2023-10-03 | 2.0 |\n| 18 | 3 | Chemistry | 2023-10-04 | 2.5 |\n| 19 | 4 | Organic | 2023-10-01 | 3.0 |\n| 20 | 4 | Physical | 2023-10-05 | 2.5 |\n+------------+------------+------------+--------------+---------------+\n</pre>\n\n<p><strong>Output:</strong></p>\n\n<pre class=\"example-io\">\n+------------+--------------+------------------+--------------+-------------------+\n| student_id | student_name | major | cycle_length | total_study_hours |\n+------------+--------------+------------------+--------------+-------------------+\n| 2 | Bob Johnson | Mathematics | 4 | 26.0 |\n| 1 | Alice Chen | Computer Science | 3 | 15.0 |\n+------------+--------------+------------------+--------------+-------------------+\n</pre>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li><strong>Alice Chen (student_id = 1):</strong>\n\n\t<ul>\n\t\t<li>Study sequence: Math → Physics → Chemistry → Math → Physics → Chemistry</li>\n\t\t<li>Pattern: 3 subjects (Math, Physics, Chemistry) repeating for 2 complete cycles</li>\n\t\t<li>Consecutive dates: Oct 1-6 with no gaps > 2 days</li>\n\t\t<li>Cycle length: 3 subjects</li>\n\t\t<li>Total hours: 2.5 + 3.0 + 2.0 + 2.5 + 3.0 + 2.0 = 15.0 hours</li>\n\t</ul>\n\t</li>\n\t<li><strong>Bob Johnson (student_id = 2):</strong>\n\t<ul>\n\t\t<li>Study sequence: Algebra → Calculus → Statistics → Geometry → Algebra → Calculus → Statistics → Geometry</li>\n\t\t<li>Pattern: 4 subjects (Algebra, Calculus, Statistics, Geometry) repeating for 2 complete cycles</li>\n\t\t<li>Consecutive dates: Oct 1-8 with no gaps > 2 days</li>\n\t\t<li>Cycle length: 4 subjects</li>\n\t\t<li>Total hours: 4.0 + 3.5 + 2.5 + 3.0 + 4.0 + 3.5 + 2.5 + 3.0 = 26.0 hours</li>\n\t</ul>\n\t</li>\n\t<li><strong>Students not included:</strong>\n\t<ul>\n\t\t<li>Carol Davis (student_id = 3): Only 2 subjects (Biology, Chemistry) - doesn't meet minimum 3 subjects requirement</li>\n\t\t<li>David Wilson (student_id = 4): Only 2 study sessions with a 4-day gap - doesn't meet consecutive dates requirement</li>\n\t\t<li>Emma Brown (student_id = 5): No study sessions recorded</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>The result table is ordered by cycle_length in descending order, then by total_study_hours in descending order.</p>\n</div>\n",
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"translatedTitle": "查找具有螺旋学习模式的学生",
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"translatedContent": "<p>表：<code>students</code></p>\n\n<pre>\n+--------------+---------+\n| Column Name | Type |\n+--------------+---------+\n| student_id | int |\n| student_name | varchar |\n| major | varchar |\n+--------------+---------+\nstudent_id 是这张表的唯一主键。\n每一行包含有关学生及其学术专业的信息。\n</pre>\n\n<p>表：<code>study_sessions</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| session_id | int |\n| student_id | int |\n| subject | varchar |\n| session_date | date |\n| hours_studied | decimal |\n+---------------+---------+\nsession_id 是这张表的唯一主键。\n每一行代表一个学生针对特定学科的学习时段。\n</pre>\n\n<p>编写一个解决方案来找出遵循 <strong>螺旋学习模式</strong> 的学生——即那些持续学习多个学科并按循环周期进行学习的学生。</p>\n\n<ul>\n\t<li>螺旋学习模式意味着学生以重复的顺序学习至少 <code>3</code> 个 <strong>不同的学科</strong>。</li>\n\t<li>模式必须重复 <strong>至少</strong><strong> </strong><code>2</code><strong> 个完整周期</strong>（最少 <code>6</code> 次学习记录）。</li>\n\t<li>两次学习记录必须是间隔不超过 <code>2</code> 天的 <strong>连续日期</strong>。</li>\n\t<li>计算 <strong>循环长度</strong>（模式中不同的学科数量）。</li>\n\t<li>计算模式中所有学习记录的 <strong>总学习时长</strong>。</li>\n\t<li>仅包含循环长度 <strong>至少为 </strong><strong> </strong><code>3</code><strong> 门学科</strong> 的学生。</li>\n</ul>\n\n<p>返回结果表按循环长度 <strong>降序</strong> 排序，然后按总学习时间 <strong>降序</strong> 排序。</p>\n\n<p>结果格式如下所示。</p>\n\n<p> </p>\n\n<p><strong class=\"example\">示例：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong></p>\n\n<p>students 表：</p>\n\n<pre class=\"example-io\">\n+------------+--------------+------------------+\n| student_id | student_name | major |\n+------------+--------------+------------------+\n| 1 | Alice Chen | Computer Science |\n| 2 | Bob Johnson | Mathematics |\n| 3 | Carol Davis | Physics |\n| 4 | David Wilson | Chemistry |\n| 5 | Emma Brown | Biology |\n+------------+--------------+------------------+\n</pre>\n\n<p>study_sessions 表：</p>\n\n<pre class=\"example-io\">\n+------------+------------+------------+--------------+---------------+\n| session_id | student_id | subject | session_date | hours_studied |\n+------------+------------+------------+--------------+---------------+\n| 1 | 1 | Math | 2023-10-01 | 2.5 |\n| 2 | 1 | Physics | 2023-10-02 | 3.0 |\n| 3 | 1 | Chemistry | 2023-10-03 | 2.0 |\n| 4 | 1 | Math | 2023-10-04 | 2.5 |\n| 5 | 1 | Physics | 2023-10-05 | 3.0 |\n| 6 | 1 | Chemistry | 2023-10-06 | 2.0 |\n| 7 | 2 | Algebra | 2023-10-01 | 4.0 |\n| 8 | 2 | Calculus | 2023-10-02 | 3.5 |\n| 9 | 2 | Statistics | 2023-10-03 | 2.5 |\n| 10 | 2 | Geometry | 2023-10-04 | 3.0 |\n| 11 | 2 | Algebra | 2023-10-05 | 4.0 |\n| 12 | 2 | Calculus | 2023-10-06 | 3.5 |\n| 13 | 2 | Statistics | 2023-10-07 | 2.5 |\n| 14 | 2 | Geometry | 2023-10-08 | 3.0 |\n| 15 | 3 | Biology | 2023-10-01 | 2.0 |\n| 16 | 3 | Chemistry | 2023-10-02 | 2.5 |\n| 17 | 3 | Biology | 2023-10-03 | 2.0 |\n| 18 | 3 | Chemistry | 2023-10-04 | 2.5 |\n| 19 | 4 | Organic | 2023-10-01 | 3.0 |\n| 20 | 4 | Physical | 2023-10-05 | 2.5 |\n+------------+------------+------------+--------------+---------------+\n</pre>\n\n<p><strong>输出：</strong></p>\n\n<pre class=\"example-io\">\n+------------+--------------+------------------+--------------+-------------------+\n| student_id | student_name | major | cycle_length | total_study_hours |\n+------------+--------------+------------------+--------------+-------------------+\n| 2 | Bob Johnson | Mathematics | 4 | 26.0 |\n| 1 | Alice Chen | Computer Science | 3 | 15.0 |\n+------------+--------------+------------------+--------------+-------------------+\n</pre>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li><strong>Alice Chen (student_id = 1):</strong>\n\n\t<ul>\n\t\t<li>学习序列：Math → Physics → Chemistry → Math → Physics → Chemistry</li>\n\t\t<li>模式：3 门学科（Math，Physics，Chemistry）重复 2 个完整周期</li>\n\t\t<li>连续日期：十月 1-6，没有超过 2 天的间隔</li>\n\t\t<li>循环长度：3 门学科</li>\n\t\t<li>总时间：2.5 + 3.0 + 2.0 + 2.5 + 3.0 + 2.0 = 15.0 小时</li>\n\t</ul>\n\t</li>\n\t<li><strong>Bob Johnson (student_id = 2):</strong>\n\t<ul>\n\t\t<li>学习序列：Algebra → Calculus → Statistics → Geometry → Algebra → Calculus → Statistics → Geometry</li>\n\t\t<li>模式：4 门学科（Algebra，Calculus，Statistics，Geometry）重复 2 个完整周期</li>\n\t\t<li>连续日期：十月 1-8，没有超过 2 天的间隔</li>\n\t\t<li>循环长度：4 门学科</li>\n\t\t<li>总时间：4.0 + 3.5 + 2.5 + 3.0 + 4.0 + 3.5 + 2.5 + 3.0 = 26.0 小时</li>\n\t</ul>\n\t</li>\n\t<li><strong>未包含学生：</strong>\n\t<ul>\n\t\t<li>Carol Davis (student_id = 3)：仅 2 门学科（生物，化学）- 未满足至少 3 门学科的要求</li>\n\t\t<li>David Wilson (student_id = 4)：仅 2 次学习课程，间隔 4 天 - 不符合连续日期要求</li>\n\t\t<li>Emma Brown (student_id = 5)：没有记录学习课程</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>结果表以 cycle_length 降序排序，然后以 total_study_hours 降序排序。</p>\n</div>\n",
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"sampleTestCase": "{\"headers\":{\"students\":[\"student_id\",\"student_name\",\"major\"],\"study_sessions\":[\"session_id\",\"student_id\",\"subject\",\"session_date\",\"hours_studied\"]},\"rows\":{\"students\":[[1,\"Alice Chen\",\"Computer Science\"],[2,\"Bob Johnson\",\"Mathematics\"],[3,\"Carol Davis\",\"Physics\"],[4,\"David Wilson\",\"Chemistry\"],[5,\"Emma Brown\",\"Biology\"]],\"study_sessions\":[[1,1,\"Math\",\"2023-10-01\",2.5],[2,1,\"Physics\",\"2023-10-02\",3.0],[3,1,\"Chemistry\",\"2023-10-03\",2.0],[4,1,\"Math\",\"2023-10-04\",2.5],[5,1,\"Physics\",\"2023-10-05\",3.0],[6,1,\"Chemistry\",\"2023-10-06\",2.0],[7,2,\"Algebra\",\"2023-10-01\",4.0],[8,2,\"Calculus\",\"2023-10-02\",3.5],[9,2,\"Statistics\",\"2023-10-03\",2.5],[10,2,\"Geometry\",\"2023-10-04\",3.0],[11,2,\"Algebra\",\"2023-10-05\",4.0],[12,2,\"Calculus\",\"2023-10-06\",3.5],[13,2,\"Statistics\",\"2023-10-07\",2.5],[14,2,\"Geometry\",\"2023-10-08\",3.0],[15,3,\"Biology\",\"2023-10-01\",2.0],[16,3,\"Chemistry\",\"2023-10-02\",2.5],[17,3,\"Biology\",\"2023-10-03\",2.0],[18,3,\"Chemistry\",\"2023-10-04\",2.5],[19,4,\"Organic\",\"2023-10-01\",3.0],[20,4,\"Physical\",\"2023-10-05\",2.5]]}}",
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"CREATE TABLE if not exists students (\n student_id INT,\n student_name VARCHAR(255),\n major VARCHAR(100)\n)",
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"CREATE TABLE study_sessions (\n session_id INT,\n student_id INT,\n subject VARCHAR(100),\n session_date DATE,\n hours_studied DECIMAL(4, 2)\n)",
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"Truncate table students",
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"insert into students (student_id, student_name, major) values ('1', 'Alice Chen', 'Computer Science')",
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"insert into students (student_id, student_name, major) values ('2', 'Bob Johnson', 'Mathematics')",
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"insert into study_sessions (session_id, student_id, subject, session_date, hours_studied) values ('1', '1', 'Math', '2023-10-01', '2.5')",
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