Dev

solution/0100-0199/0176.Second Highest Salary/README_EN.md

@@ -19,9 +19,9 @@ Each row of this table contains information about the salary of an employee.
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report the second highest salary from the <code>Employee</code> table. If there is no second highest salary, the query should report <code>null</code>.</p>
+<p>Find&nbsp;the second highest salary from the <code>Employee</code> table. If there is no second highest salary,&nbsp;return&nbsp;<code>null</code>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0100-0199/0177.Nth Highest Salary/README_EN.md

@@ -19,9 +19,9 @@ Each row of this table contains information about the salary of an employee.
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report the <code>n<sup>th</sup></code> highest salary from the <code>Employee</code> table. If there is no <code>n<sup>th</sup></code> highest salary, the query should report <code>null</code>.</p>
+<p>Find the <code>n<sup>th</sup></code> highest salary from the <code>Employee</code> table. If there is no <code>n<sup>th</sup></code> highest salary, return&nbsp;<code>null</code>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0100-0199/0178.Rank Scores/README_EN.md

@@ -19,7 +19,7 @@ Each row of this table contains the score of a game. Score is a floating point v
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to rank the scores. The ranking should be calculated according to the following rules:</p>
+<p>Find the rank of the scores. The ranking should be calculated according to the following rules:</p>
 
 <ul>
 	<li>The scores should be ranked from the highest to the lowest.</li>
@@ -29,7 +29,7 @@ Each row of this table contains the score of a game. Score is a floating point v
 
 <p>Return the result table ordered by <code>score</code> in descending order.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0100-0199/0183.Customers Who Never Order/README_EN.md

@@ -35,11 +35,11 @@ Each row of this table indicates the ID of an order and the ID of the customer w
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report all customers who never order anything.</p>
+<p>Find all customers who never order anything.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0100-0199/0184.Department Highest Salary/README_EN.md

@@ -37,11 +37,11 @@ Each row of this table indicates the ID of a department and its name.
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to find employees who have the highest salary in each of the departments.</p>
+<p>Find employees who have the highest salary in each of the departments.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0100-0199/0196.Delete Duplicate Emails/README_EN.md

@@ -19,11 +19,11 @@ Each row of this table contains an email. The emails will not contain uppercase
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to <strong>delete</strong> all the duplicate emails, keeping only one unique email with the smallest <code>id</code>. Note that you are supposed to write a <code>DELETE</code> statement and not a <code>SELECT</code> one.</p>
+<p><strong>Delete</strong> all the duplicate emails, keeping only one unique email with the smallest <code>id</code>. (For SQL users, please note that you are supposed to write a <code>DELETE</code> statement and not a <code>SELECT</code> one.)</p>
 
 <p>After running your script, the answer shown is the <code>Person</code> table. The driver will first compile and run your piece of code and then show the <code>Person</code> table. The final order of the <code>Person</code> table <strong>does not matter</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0300-0399/0304.Range Sum Query 2D - Immutable/README.md

@@ -175,7 +175,7 @@ public:
  */
 
 struct NumMatrix {
-    // Of size (N + 1) * (M + 1) 
+    // Of size (N + 1) * (M + 1)
     prefix_vec: Vec<Vec<i32>>,
     n: usize,
     m: usize,
@@ -184,22 +184,22 @@ struct NumMatrix {
 }
 
 
-/** 
+/**
  * `&self` means the method takes an immutable reference.
  * If you need a mutable reference, change it to `&mut self` instead.
  */
 impl NumMatrix {
 
     fn new(matrix: Vec<Vec<i32>>) -> Self {
-        NumMatrix { 
+        NumMatrix {
             prefix_vec: vec![vec![0; matrix[0].len() + 1]; matrix.len() + 1],
             n: matrix.len(),
             m: matrix[0].len(),
             is_initialized: false,
             ref_vec: matrix,
         }
     }
-    
+
     fn sum_region(&mut self, row1: i32, col1: i32, row2: i32, col2: i32) -> i32 {
         if !self.is_initialized {
             self.initialize_prefix_vec();

solution/0300-0399/0304.Range Sum Query 2D - Immutable/README_EN.md

@@ -52,7 +52,7 @@ numMatrix.sumRegion(1, 2, 2, 4); // return 12 (i.e sum of the blue rectangle)
 
 ## Solutions
 
-We use $s[i + 1][j + 1]$ to represent the sum of all elements in the upper-left part up to the $i$-th row and $j$-th column, where the indices $i$ and $j$ both start from $0$. 
+We use $s[i + 1][j + 1]$ to represent the sum of all elements in the upper-left part up to the $i$-th row and $j$-th column, where the indices $i$ and $j$ both start from $0$.
 
 We can derive the following prefix sum formula:
 
@@ -166,7 +166,7 @@ public:
  */
 
  struct NumMatrix {
-    // Of size (N + 1) * (M + 1) 
+    // Of size (N + 1) * (M + 1)
     prefix_vec: Vec<Vec<i32>>,
     n: usize,
     m: usize,
@@ -175,22 +175,22 @@ public:
 }
 
 
-/** 
+/**
  * `&self` means the method takes an immutable reference.
  * If you need a mutable reference, change it to `&mut self` instead.
  */
 impl NumMatrix {
 
     fn new(matrix: Vec<Vec<i32>>) -> Self {
-        NumMatrix { 
+        NumMatrix {
             prefix_vec: vec![vec![0; matrix[0].len() + 1]; matrix.len() + 1],
             n: matrix.len(),
             m: matrix[0].len(),
             is_initialized: false,
             ref_vec: matrix,
         }
     }
-    
+
     fn sum_region(&mut self, row1: i32, col1: i32, row2: i32, col2: i32) -> i32 {
         if !self.is_initialized {
             self.initialize_prefix_vec();

solution/0300-0399/0373.Find K Pairs with Smallest Sums/README.md

@@ -6,15 +6,15 @@
 
 <!-- 这里写题目描述 -->
 
-<p>给定两个以 <strong>升序排列</strong> 的整数数组 <code>nums1</code> 和<strong> </strong><code>nums2</code><strong>&nbsp;</strong>,&nbsp;以及一个整数 <code>k</code><strong>&nbsp;</strong>。</p>
+<p>给定两个以 <strong>非递减顺序排列</strong> 的整数数组 <code>nums1</code> 和<strong> </strong><code>nums2</code><strong>&nbsp;</strong>,&nbsp;以及一个整数 <code>k</code><strong>&nbsp;</strong>。</p>
 
 <p>定义一对值&nbsp;<code>(u,v)</code>，其中第一个元素来自&nbsp;<code>nums1</code>，第二个元素来自 <code>nums2</code><strong>&nbsp;</strong>。</p>
 
 <p>请找到和最小的 <code>k</code>&nbsp;个数对&nbsp;<code>(u<sub>1</sub>,v<sub>1</sub>)</code>, <code>&nbsp;(u<sub>2</sub>,v<sub>2</sub>)</code> &nbsp;... &nbsp;<code>(u<sub>k</sub>,v<sub>k</sub>)</code>&nbsp;。</p>
 
 <p>&nbsp;</p>
 
-<p><strong>示例 1:</strong></p>
+<p><strong class="example">示例 1:</strong></p>
 
 <pre>
 <strong>输入:</strong> nums1 = [1,7,11], nums2 = [2,4,6], k = 3
@@ -23,7 +23,7 @@
      [1,2],[1,4],[1,6],[7,2],[7,4],[11,2],[7,6],[11,4],[11,6]
 </pre>
 
-<p><strong>示例 2:</strong></p>
+<p><strong class="example">示例 2:</strong></p>
 
 <pre>
 <strong>输入: </strong>nums1 = [1,1,2], nums2 = [1,2,3], k = 2
@@ -32,7 +32,7 @@
 &nbsp;    [1,1],[1,1],[1,2],[2,1],[1,2],[2,2],[1,3],[1,3],[2,3]
 </pre>
 
-<p><strong>示例 3:</strong></p>
+<p><strong class="example">示例 3:</strong></p>
 
 <pre>
 <strong>输入: </strong>nums1 = [1,2], nums2 = [3], k = 3 

solution/0500-0599/0511.Game Play Analysis I/README_EN.md

@@ -22,11 +22,11 @@ Each row is a record of a player who logged in and played a number of games (pos
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report the <strong>first login date</strong> for each player.</p>
+<p>Find the <strong>first login date</strong> for each player.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0500-0599/0570.Managers with at Least 5 Direct Reports/README_EN.md

@@ -23,11 +23,11 @@ No employee will be the manager of themself.
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report the managers with at least <strong>five direct reports</strong>.</p>
+<p>Find the managers with at least <strong>five direct reports</strong>.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0500-0599/0585.Investments in 2016/README.md

@@ -6,56 +6,68 @@
 
 <!-- 这里写题目描述 -->
 
-<p>写一个查询语句，将&nbsp;2016 年 (<strong>TIV_2016</strong>) 所有成功投资的金额加起来，保留 2 位小数。</p>
-
-<p>对于一个投保人，他在 2016 年成功投资的条件是：</p>
-
-<ol>
-	<li>他在 2015 年的投保额&nbsp;(<strong>TIV_2015</strong>) 至少跟一个其他投保人在 2015 年的投保额相同。</li>
-	<li>他所在的城市必须与其他投保人都不同（也就是说维度和经度不能跟其他任何一个投保人完全相同）。</li>
-</ol>
-
-<p><strong>输入格式:</strong><br>
-表&nbsp;<strong><em>insurance</em></strong> 格式如下：</p>
-
-<pre>| Column Name | Type          |
-|-------------|---------------|
-| PID         | INTEGER(11)   |
-| TIV_2015    | NUMERIC(15,2) |
-| TIV_2016    | NUMERIC(15,2) |
-| LAT         | NUMERIC(5,2)  |
-| LON         | NUMERIC(5,2)  |
-</pre>
-
-<p><strong>PID</strong>&nbsp;字段是投保人的投保编号，&nbsp;<strong>TIV_2015</strong> 是该投保人在2015年的总投保金额，&nbsp;<strong>TIV_2016</strong> 是该投保人在2016年的投保金额，&nbsp;<strong>LAT</strong> 是投保人所在城市的维度，&nbsp;<strong>LON</strong>&nbsp;是投保人所在城市的经度。</p>
-
-<p><strong>样例输入</strong></p>
-
-<pre>| PID | TIV_2015 | TIV_2016 | LAT | LON |
-|-----|----------|----------|-----|-----|
+<p><code>Insurance</code> 表：</p>
+
+<div class="original__bRMd">
+<div>
+<pre>
++-------------+-------+
+| Column Name | Type  |
++-------------+-------+
+| pid         | int   |
+| tiv_2015    | float |
+| tiv_2016    | float |
+| lat         | float |
+| lon         | float |
++-------------+-------+
+pid 是这张表的主键。
+表中的每一行都包含一条保险信息，其中：
+pid 是投保人的投保编号。
+tiv_2015 是该投保人在 2015 年的总投保金额，tiv_2016 是该投保人在 2016 年的总投保金额。
+lat 是投保人所在城市的纬度。题目数据确保 lat 不为空。
+lon 是投保人所在城市的经度。题目数据确保 lon 不为空。</pre>
+
+<p>&nbsp;</p>
+
+<p>请你编写一个 SQL 查询，报告 2016 年 (<code>tiv_2016</code>) 所有满足下述条件的投保人的投保金额之和：</p>
+
+<ul>
+	<li>他在 2015 年的投保额&nbsp;(<code>tiv_2015</code>) 至少跟一个其他投保人在 2015 年的投保额相同。</li>
+	<li>他所在的城市必须与其他投保人都不同（也就是说&nbsp;(<code>lat, lon</code>) 不能跟其他任何一个投保人完全相同）。</li>
+</ul>
+
+<p><code>tiv_2016</code> 四舍五入的 <strong>两位小数</strong> 。</p>
+
+<p>查询结果格式如下例所示。</p>
+
+<p>&nbsp;</p>
+
+<p><strong class="example">示例：</strong></p>
+
+<pre>
+<strong>输入：</strong>
+Insurance 表：
++-----+----------+----------+-----+-----+
+| pid | tiv_2015 | tiv_2016 | lat | lon |
++-----+----------+----------+-----+-----+
 | 1   | 10       | 5        | 10  | 10  |
 | 2   | 20       | 20       | 20  | 20  |
 | 3   | 10       | 30       | 20  | 20  |
 | 4   | 10       | 40       | 40  | 40  |
-</pre>
-
-<p><strong>样例输出</strong></p>
-
-<pre>| TIV_2016 |
-|----------|
++-----+----------+----------+-----+-----+
+<strong>输出：</strong>
++----------+
+| tiv_2016 |
++----------+
 | 45.00    |
-</pre>
-
-<p><strong>解释</strong></p>
-
-<pre>就如最后一个投保人，第一个投保人同时满足两个条件：
-1. 他在 2015 年的投保金额 <strong>TIV_2015 </strong>为 &#39;10&#39; ，与第三个和第四个投保人在 2015 年的投保金额相同。
-2. 他所在城市的经纬度是独一无二的。
-
-第二个投保人两个条件都不满足。他在 2015 年的投资 <strong>TIV_2015 </strong>与其他任何投保人都不相同。
-且他所在城市的经纬度与第三个投保人相同。基于同样的原因，第三个投保人投资失败。
-
-所以返回的结果是第一个投保人和最后一个投保人的 <strong>TIV_2016 </strong>之和，结果是 45 。</pre>
++----------+
+<strong>解释：
+</strong>表中的第一条记录和最后一条记录都满足两个条件。
+tiv_2015 值为 10 与第三条和第四条记录相同，且其位置是唯一的。
+第二条记录不符合任何一个条件。其 tiv_2015 与其他投保人不同，并且位置与第三条记录相同，这也导致了第三条记录不符合题目要求。
+因此，结果是第一条记录和最后一条记录的 tiv_2016 之和，即 45 。</pre>
+</div>
+</div>
 
 ## 解法
 

solution/0500-0599/0586.Customer Placing the Largest Number of Orders/README_EN.md

@@ -19,11 +19,11 @@ This table contains information about the order ID and the customer ID.
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to find the <code>customer_number</code> for the customer who has placed <strong>the largest number of orders</strong>.</p>
+<p>Find the <code>customer_number</code> for the customer who has placed <strong>the largest number of orders</strong>.</p>
 
 <p>The test cases are generated so that <strong>exactly one customer</strong> will have placed more orders than any other customer.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0500-0599/0595.Big Countries/README_EN.md

@@ -29,11 +29,11 @@ Each row of this table gives information about the name of a country, the contin
 	<li>it has a population of at least&nbsp;twenty-five million (i.e., <code>25000000</code>).</li>
 </ul>
 
-<p>Write an SQL query to report the name, population, and area of the <strong>big countries</strong>.</p>
+<p>Find the name, population, and area of the <strong>big countries</strong>.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0500-0599/0596.Classes More Than 5 Students/README_EN.md

@@ -19,11 +19,11 @@ Each row of this table indicates the name of a student and the class in which th
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report all the classes that have <strong>at least five students</strong>.</p>
+<p>Find all the classes that have <strong>at least five students</strong>.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The&nbsp;result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>

solution/0600-0699/0607.Sales Person/README_EN.md

@@ -58,11 +58,11 @@ Each row of this table contains information about one order. This includes the I
 
 <p>&nbsp;</p>
 
-<p>Write an SQL query to report the names of all the salespersons who did not have any orders related to the company with the name <strong>&quot;RED&quot;</strong>.</p>
+<p>Find the names of all the salespersons who did not have any orders related to the company with the name <strong>&quot;RED&quot;</strong>.</p>
 
 <p>Return the result table in <strong>any order</strong>.</p>
 
-<p>The query result format is in the following example.</p>
+<p>The result format is in the following example.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>