doocs · yanglbme · Jul 1, 2025 · Jul 1, 2025
diff --git a/solution/3600-3699/3601.Find Drivers with Improved Fuel Efficiency/README.md b/solution/3600-3699/3601.Find Drivers with Improved Fuel Efficiency/README.md
@@ -0,0 +1,169 @@
+---
+comments: true
+difficulty: 中等
+edit_url: https://github.com/doocs/leetcode/edit/main/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md
+tags:
+    - 数据库
+---
+
+<!-- problem:start -->
+
+# [3601. Find Drivers with Improved Fuel Efficiency](https://leetcode.cn/problems/find-drivers-with-improved-fuel-efficiency)
+
+[English Version](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README_EN.md)
+
+## 题目描述
+
+<!-- description:start -->
+
+<p>Table: <code>drivers</code></p>
+
+<pre>
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| driver_id   | int     |
+| driver_name | varchar |
++-------------+---------+
+driver_id is the unique identifier for this table.
+Each row contains information about a driver.
+</pre>
+
+<p>Table: <code>trips</code></p>
+
+<pre>
++---------------+---------+
+| Column Name   | Type    |
++---------------+---------+
+| trip_id       | int     |
+| driver_id     | int     |
+| trip_date     | date    |
+| distance_km   | decimal |
+| fuel_consumed | decimal |
++---------------+---------+
+trip_id is the unique identifier for this table.
+Each row represents a trip made by a driver, including the distance traveled and fuel consumed for that trip.
+</pre>
+
+<p>Write a solution to find drivers whose <strong>fuel efficiency has improved</strong> by <strong>comparing</strong> their average fuel efficiency in the<strong> first half</strong> of the year with the <strong>second half</strong> of the year.</p>
+
+<ul>
+	<li>Calculate <strong>fuel efficiency</strong> as <code>distance_km / fuel_consumed</code> for <strong>each</strong> trip</li>
+	<li><strong>First half</strong>: January to June, <strong>Second half</strong>: July to December</li>
+	<li>Only include drivers who have trips in <strong>both halves</strong> of the year</li>
+	<li>Calculate the <strong>efficiency improvement</strong> as (<code>second_half_avg - first_half_avg</code>)</li>
+	<li><strong>Round </strong>all<strong> </strong>results<strong> </strong>to<strong> <code>2</code> </strong>decimal<strong> </strong>places</li>
+</ul>
+
+<p>Return <em>the result table ordered by efficiency improvement in <strong>descending</strong> order, then by driver name in <strong>ascending</strong> order</em>.</p>
+
+<p>The result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong></p>
+
+<p>drivers table:</p>
+
+<pre class="example-io">
++-----------+---------------+
+| driver_id | driver_name   |
++-----------+---------------+
+| 1         | Alice Johnson |
+| 2         | Bob Smith     |
+| 3         | Carol Davis   |
+| 4         | David Wilson  |
+| 5         | Emma Brown    |
++-----------+---------------+
+</pre>
+
+<p>trips table:</p>
+
+<pre class="example-io">
++---------+-----------+------------+-------------+---------------+
+| trip_id | driver_id | trip_date  | distance_km | fuel_consumed |
++---------+-----------+------------+-------------+---------------+
+| 1       | 1         | 2023-02-15 | 120.5       | 10.2          |
+| 2       | 1         | 2023-03-20 | 200.0       | 16.5          |
+| 3       | 1         | 2023-08-10 | 150.0       | 11.0          |
+| 4       | 1         | 2023-09-25 | 180.0       | 12.5          |
+| 5       | 2         | 2023-01-10 | 100.0       | 9.0           |
+| 6       | 2         | 2023-04-15 | 250.0       | 22.0          |
+| 7       | 2         | 2023-10-05 | 200.0       | 15.0          |
+| 8       | 3         | 2023-03-12 | 80.0        | 8.5           |
+| 9       | 3         | 2023-05-18 | 90.0        | 9.2           |
+| 10      | 4         | 2023-07-22 | 160.0       | 12.8          |
+| 11      | 4         | 2023-11-30 | 140.0       | 11.0          |
+| 12      | 5         | 2023-02-28 | 110.0       | 11.5          |
++---------+-----------+------------+-------------+---------------+
+</pre>
+
+<p><strong>Output:</strong></p>
+
+<pre class="example-io">
++-----------+---------------+------------------+-------------------+------------------------+
+| driver_id | driver_name   | first_half_avg   | second_half_avg   | efficiency_improvement |
++-----------+---------------+------------------+-------------------+------------------------+
+| 2         | Bob Smith     | 11.24            | 13.33             | 2.10                   |
+| 1         | Alice Johnson | 11.97            | 14.02             | 2.05                   |
++-----------+---------------+------------------+-------------------+------------------------+
+</pre>
+
+<p><strong>Explanation:</strong></p>
+
+<ul>
+	<li><strong>Alice Johnson (driver_id = 1):</strong>
+
+    <ul>
+    	<li>First half trips (Jan-Jun): Feb 15 (120.5/10.2 = 11.81), Mar 20 (200.0/16.5 = 12.12)</li>
+    	<li>First half average efficiency: (11.81 + 12.12) / 2 = 11.97</li>
+    	<li>Second half trips (Jul-Dec): Aug 10 (150.0/11.0 = 13.64), Sep 25 (180.0/12.5 = 14.40)</li>
+    	<li>Second half average efficiency: (13.64 + 14.40) / 2 = 14.02</li>
+    	<li>Efficiency improvement: 14.02 - 11.97 = 2.05</li>
+    </ul>
+    </li>
+    <li><strong>Bob Smith (driver_id = 2):</strong>
+    <ul>
+    	<li>First half trips: Jan 10 (100.0/9.0 = 11.11), Apr 15 (250.0/22.0 = 11.36)</li>
+    	<li>First half average efficiency: (11.11 + 11.36) / 2 = 11.24</li>
+    	<li>Second half trips: Oct 5 (200.0/15.0 = 13.33)</li>
+    	<li>Second half average efficiency: 13.33</li>
+    	<li>Efficiency improvement: 13.33 - 11.24 = 2.09</li>
+    </ul>
+    </li>
+    <li><strong>Drivers not included:</strong>
+    <ul>
+    	<li>Carol Davis (driver_id = 3): Only has trips in first half (Mar, May)</li>
+    	<li>David Wilson (driver_id = 4): Only has trips in second half (Jul, Nov)</li>
+    	<li>Emma Brown (driver_id = 5): Only has trips in first half (Feb)</li>
+    </ul>
+    </li>
+
+</ul>
+
+<p>The output table is ordered by efficiency improvement in descending order then by name in ascending order.</p>
+</div>
+
+<!-- description:end -->
+
+## 解法
+
+<!-- solution:start -->
+
+### 方法一
+
+<!-- tabs:start -->
+
+#### MySQL
+
+```sql
+
+```
+
+<!-- tabs:end -->
+
+<!-- solution:end -->
+
+<!-- problem:end -->
diff --git a/solution/3600-3699/3601.Find Drivers with Improved Fuel Efficiency/README_EN.md b/solution/3600-3699/3601.Find Drivers with Improved Fuel Efficiency/README_EN.md
@@ -0,0 +1,169 @@
+---
+comments: true
+difficulty: Medium
+edit_url: https://github.com/doocs/leetcode/edit/main/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README_EN.md
+tags:
+    - Database
+---
+
+<!-- problem:start -->
+
+# [3601. Find Drivers with Improved Fuel Efficiency](https://leetcode.com/problems/find-drivers-with-improved-fuel-efficiency)
+
+[中文文档](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)
+
+## Description
+
+<!-- description:start -->
+
+<p>Table: <code>drivers</code></p>
+
+<pre>
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| driver_id   | int     |
+| driver_name | varchar |
++-------------+---------+
+driver_id is the unique identifier for this table.
+Each row contains information about a driver.
+</pre>
+
+<p>Table: <code>trips</code></p>
+
+<pre>
++---------------+---------+
+| Column Name   | Type    |
++---------------+---------+
+| trip_id       | int     |
+| driver_id     | int     |
+| trip_date     | date    |
+| distance_km   | decimal |
+| fuel_consumed | decimal |
++---------------+---------+
+trip_id is the unique identifier for this table.
+Each row represents a trip made by a driver, including the distance traveled and fuel consumed for that trip.
+</pre>
+
+<p>Write a solution to find drivers whose <strong>fuel efficiency has improved</strong> by <strong>comparing</strong> their average fuel efficiency in the<strong> first half</strong> of the year with the <strong>second half</strong> of the year.</p>
+
+<ul>
+	<li>Calculate <strong>fuel efficiency</strong> as <code>distance_km / fuel_consumed</code> for <strong>each</strong> trip</li>
+	<li><strong>First half</strong>: January to June, <strong>Second half</strong>: July to December</li>
+	<li>Only include drivers who have trips in <strong>both halves</strong> of the year</li>
+	<li>Calculate the <strong>efficiency improvement</strong> as (<code>second_half_avg - first_half_avg</code>)</li>
+	<li><strong>Round </strong>all<strong> </strong>results<strong> </strong>to<strong> <code>2</code> </strong>decimal<strong> </strong>places</li>
+</ul>
+
+<p>Return <em>the result table ordered by efficiency improvement in <strong>descending</strong> order, then by driver name in <strong>ascending</strong> order</em>.</p>
+
+<p>The result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong></p>
+
+<p>drivers table:</p>
+
+<pre class="example-io">
++-----------+---------------+
+| driver_id | driver_name   |
++-----------+---------------+
+| 1         | Alice Johnson |
+| 2         | Bob Smith     |
+| 3         | Carol Davis   |
+| 4         | David Wilson  |
+| 5         | Emma Brown    |
++-----------+---------------+
+</pre>
+
+<p>trips table:</p>
+
+<pre class="example-io">
++---------+-----------+------------+-------------+---------------+
+| trip_id | driver_id | trip_date  | distance_km | fuel_consumed |
++---------+-----------+------------+-------------+---------------+
+| 1       | 1         | 2023-02-15 | 120.5       | 10.2          |
+| 2       | 1         | 2023-03-20 | 200.0       | 16.5          |
+| 3       | 1         | 2023-08-10 | 150.0       | 11.0          |
+| 4       | 1         | 2023-09-25 | 180.0       | 12.5          |
+| 5       | 2         | 2023-01-10 | 100.0       | 9.0           |
+| 6       | 2         | 2023-04-15 | 250.0       | 22.0          |
+| 7       | 2         | 2023-10-05 | 200.0       | 15.0          |
+| 8       | 3         | 2023-03-12 | 80.0        | 8.5           |
+| 9       | 3         | 2023-05-18 | 90.0        | 9.2           |
+| 10      | 4         | 2023-07-22 | 160.0       | 12.8          |
+| 11      | 4         | 2023-11-30 | 140.0       | 11.0          |
+| 12      | 5         | 2023-02-28 | 110.0       | 11.5          |
++---------+-----------+------------+-------------+---------------+
+</pre>
+
+<p><strong>Output:</strong></p>
+
+<pre class="example-io">
++-----------+---------------+------------------+-------------------+------------------------+
+| driver_id | driver_name   | first_half_avg   | second_half_avg   | efficiency_improvement |
++-----------+---------------+------------------+-------------------+------------------------+
+| 2         | Bob Smith     | 11.24            | 13.33             | 2.10                   |
+| 1         | Alice Johnson | 11.97            | 14.02             | 2.05                   |
++-----------+---------------+------------------+-------------------+------------------------+
+</pre>
+
+<p><strong>Explanation:</strong></p>
+
+<ul>
+	<li><strong>Alice Johnson (driver_id = 1):</strong>
+
+    <ul>
+    	<li>First half trips (Jan-Jun): Feb 15 (120.5/10.2 = 11.81), Mar 20 (200.0/16.5 = 12.12)</li>
+    	<li>First half average efficiency: (11.81 + 12.12) / 2 = 11.97</li>
+    	<li>Second half trips (Jul-Dec): Aug 10 (150.0/11.0 = 13.64), Sep 25 (180.0/12.5 = 14.40)</li>
+    	<li>Second half average efficiency: (13.64 + 14.40) / 2 = 14.02</li>
+    	<li>Efficiency improvement: 14.02 - 11.97 = 2.05</li>
+    </ul>
+    </li>
+    <li><strong>Bob Smith (driver_id = 2):</strong>
+    <ul>
+    	<li>First half trips: Jan 10 (100.0/9.0 = 11.11), Apr 15 (250.0/22.0 = 11.36)</li>
+    	<li>First half average efficiency: (11.11 + 11.36) / 2 = 11.24</li>
+    	<li>Second half trips: Oct 5 (200.0/15.0 = 13.33)</li>
+    	<li>Second half average efficiency: 13.33</li>
+    	<li>Efficiency improvement: 13.33 - 11.24 = 2.09</li>
+    </ul>
+    </li>
+    <li><strong>Drivers not included:</strong>
+    <ul>
+    	<li>Carol Davis (driver_id = 3): Only has trips in first half (Mar, May)</li>
+    	<li>David Wilson (driver_id = 4): Only has trips in second half (Jul, Nov)</li>
+    	<li>Emma Brown (driver_id = 5): Only has trips in first half (Feb)</li>
+    </ul>
+    </li>
+
+</ul>
+
+<p>The output table is ordered by efficiency improvement in descending order then by name in ascending order.</p>
+</div>
+
+<!-- description:end -->
+
+## Solutions
+
+<!-- solution:start -->
+
+### Solution 1
+
+<!-- tabs:start -->
+
+#### MySQL
+
+```sql
+
+```
+
+<!-- tabs:end -->
+
+<!-- solution:end -->
+
+<!-- problem:end -->
diff --git a/solution/DATABASE_README.md b/solution/DATABASE_README.md
@@ -320,6 +320,7 @@
 | 3570 | [查找无可用副本的书籍](/solution/3500-3599/3570.Find%20Books%20with%20No%20Available%20Copies/README.md)                                                     | `数据库` | 简单 |      |
 | 3580 | [寻找持续进步的员工](/solution/3500-3599/3580.Find%20Consistently%20Improving%20Employees/README.md)                                                         | `数据库` | 中等 |      |
 | 3586 | [寻找 COVID 康复患者](/solution/3500-3599/3586.Find%20COVID%20Recovery%20Patients/README.md)                                                                 | `数据库` | 中等 |      |
+| 3601 | [Find Drivers with Improved Fuel Efficiency](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)                        |          | 中等 |      |
 
 ## 版权
 

diff --git a/solution/DATABASE_README_EN.md b/solution/DATABASE_README_EN.md
@@ -318,6 +318,7 @@ Press <kbd>Control</kbd> + <kbd>F</kbd>(or <kbd>Command</kbd> + <kbd>F</kbd> on
 | 3570 | [Find Books with No Available Copies](/solution/3500-3599/3570.Find%20Books%20with%20No%20Available%20Copies/README_EN.md)                                                                   | `Database` | Easy       |        |
 | 3580 | [Find Consistently Improving Employees](/solution/3500-3599/3580.Find%20Consistently%20Improving%20Employees/README_EN.md)                                                                   | `Database` | Medium     |        |
 | 3586 | [Find COVID Recovery Patients](/solution/3500-3599/3586.Find%20COVID%20Recovery%20Patients/README_EN.md)                                                                                     | `Database` | Medium     |        |
+| 3601 | [Find Drivers with Improved Fuel Efficiency](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README_EN.md)                                                     |            | Medium     |        |
 
 ## Copyright
 

diff --git a/solution/README.md b/solution/README.md
@@ -3611,6 +3611,7 @@
 |  3598  |  [相邻字符串之间的最长公共前缀](/solution/3500-3599/3598.Longest%20Common%20Prefix%20Between%20Adjacent%20Strings%20After%20Removals/README.md)  |    |  中等  |  第 456 场周赛  |
 |  3599  |  [划分数组得到最小 XOR](/solution/3500-3599/3599.Partition%20Array%20to%20Minimize%20XOR/README.md)  |    |  中等  |  第 456 场周赛  |
 |  3600  |  [升级后最大生成树稳定性](/solution/3600-3699/3600.Maximize%20Spanning%20Tree%20Stability%20with%20Upgrades/README.md)  |    |  困难  |  第 456 场周赛  |
+|  3601  |  [Find Drivers with Improved Fuel Efficiency](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md)  |    |  中等  |    |
 
 ## 版权
 

diff --git a/solution/README_EN.md b/solution/README_EN.md
@@ -3609,6 +3609,7 @@ Press <kbd>Control</kbd> + <kbd>F</kbd>(or <kbd>Command</kbd> + <kbd>F</kbd> on
 |  3598  |  [Longest Common Prefix Between Adjacent Strings After Removals](/solution/3500-3599/3598.Longest%20Common%20Prefix%20Between%20Adjacent%20Strings%20After%20Removals/README_EN.md)  |    |  Medium  |  Weekly Contest 456  |
 |  3599  |  [Partition Array to Minimize XOR](/solution/3500-3599/3599.Partition%20Array%20to%20Minimize%20XOR/README_EN.md)  |    |  Medium  |  Weekly Contest 456  |
 |  3600  |  [Maximize Spanning Tree Stability with Upgrades](/solution/3600-3699/3600.Maximize%20Spanning%20Tree%20Stability%20with%20Upgrades/README_EN.md)  |    |  Hard  |  Weekly Contest 456  |
+|  3601  |  [Find Drivers with Improved Fuel Efficiency](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README_EN.md)  |    |  Medium  |    |
 
 ## Copyright