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@@ -24,4 +24,5 @@ node_modules/
/solution/2200-2299/2230.The Users That Are Eligible for Discount/Solution.sql
/solution/2200-2299/2252.Dynamic Pivoting of a Table/Solution.sql
/solution/2200-2299/2253.Dynamic Unpivoting of a Table/Solution.sql
-/solution/3100-3199/3150.Invalid Tweets II/Solution.sql
\ No newline at end of file
+/solution/3100-3199/3150.Invalid Tweets II/Solution.sql
+/solution/3100-3199/3198.Find Cities in Each State/Solution.sql
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diff --git a/solution/3100-3199/3198.Find Cities in Each State/README.md b/solution/3100-3199/3198.Find Cities in Each State/README.md
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@@ -0,0 +1,128 @@
+---
+comments: true
+difficulty: 简单
+edit_url: https://github.com/doocs/leetcode/edit/main/solution/3100-3199/3198.Find%20Cities%20in%20Each%20State/README.md
+---
+
+
+
+# [3198. 查找每个州的城市 🔒](https://leetcode.cn/problems/find-cities-in-each-state)
+
+[English Version](/solution/3100-3199/3198.Find%20Cities%20in%20Each%20State/README_EN.md)
+
+## 题目描述
+
+
+
+表：cities
+
+
++-------------+---------+
+| Column Name | Type |
++-------------+---------+
+| state | varchar |
+| city | varchar |
++-------------+---------+
+(state, city) 是这张表的主键（有不同值的列的组合）。
+这张表的每一行包含州名和其中的城市名。
+
+
+编写一个解决方案来 查找每个州的所有城市，并将它们组合成 一个逗号分隔 的字符串。
+
+返回结果表以 state 升序 排序。
+
+结果格式如下所示。
+
+
+
+示例：
+
+
+
输入：
+
+
cities 表：
+
+
++-------------+---------------+
+| state | city |
++-------------+---------------+
+| California | Los Angeles |
+| California | San Francisco |
+| California | San Diego |
+| Texas | Houston |
+| Texas | Austin |
+| Texas | Dallas |
+| New York | New York City |
+| New York | Buffalo |
+| New York | Rochester |
++-------------+---------------+
+
+
+
输出：
+
+
++-------------+---------------------------------------+
+| state | cities |
++-------------+---------------------------------------+
+| California | Los Angeles, San Diego, San Francisco |
+| New York | Buffalo, New York City, Rochester |
+| Texas | Austin, Dallas, Houston |
++-------------+---------------------------------------+
+
+
+
解释：
+
+
+ - California：所有城市 ("Los Angeles", "San Diego", "San Francisco") 以逗号分隔的字符串列出。
+ - New York：所有城市 ("Buffalo", "New York City", "Rochester") 以逗号分隔的字符串列出。
+ - Texas：所有城市 ("Austin", "Dallas", "Houston") 以逗号分隔的字符串列出。
+
+
+
注意：输出表以州名升序排序。
+
Table: cities
+
+
++-------------+---------+
+| Column Name | Type |
++-------------+---------+
+| state | varchar |
+| city | varchar |
++-------------+---------+
+(state, city) is the primary key (combination of columns with unique values) for this table.
+Each row of this table contains the state name and the city name within that state.
+
+
+Write a solution to find all the cities in each state and combine them into a single comma-separated string.
+
+Return the result table ordered by state in ascending order.
+
+The result format is in the following example.
+
+
+Example:
+
+
+
Input:
+
+
cities table:
+
+
++-------------+---------------+
+| state | city |
++-------------+---------------+
+| California | Los Angeles |
+| California | San Francisco |
+| California | San Diego |
+| Texas | Houston |
+| Texas | Austin |
+| Texas | Dallas |
+| New York | New York City |
+| New York | Buffalo |
+| New York | Rochester |
++-------------+---------------+
+
+
+
Output:
+
+
++-------------+---------------------------------------+
+| state | cities |
++-------------+---------------------------------------+
+| California | Los Angeles, San Diego, San Francisco |
+| New York | Buffalo, New York City, Rochester |
+| Texas | Austin, Dallas, Houston |
++-------------+---------------------------------------+
+
+
+
Explanation:
+
+
+ - California: All cities ("Los Angeles", "San Diego", "San Francisco") are listed in a comma-separated string.
+ - New York: All cities ("Buffalo", "New York City", "Rochester") are listed in a comma-separated string.
+ - Texas: All cities ("Austin", "Dallas", "Houston") are listed in a comma-separated string.
+
+
+
Note: The output table is ordered by the state name in ascending order.
+