Added task 3465

Author: javadev

README.md

@@ -2088,7 +2088,8 @@
 
 | #    |      Title     | Difficulty  | Tag         | Time, ms | Time, %
 |------|----------------|-------------|-------------|----------|--------
-| 3464 |[Maximize the Distance Between Points on a Square](src/main/kotlin/g3401_3500/s3464_maximize_the_distance_between_points_on_a_square)| Hard | Array, Greedy, Binary_Search | 18 | 98.51
+| 3465 |[Find Products with Valid Serial Numbers](src/main/kotlin/g3401_3500/s3465_find_products_with_valid_serial_numbers)| Easy | Database | 292 | 90.91
+| 3464 |[Maximize the Distance Between Points on a Square](src/main/kotlin/g3401_3500/s3464_maximize_the_distance_between_points_on_a_square)| Hard | Array, Greedy, Binary_Search | 24 | 100.00
 | 3463 |[Check If Digits Are Equal in String After Operations II](src/main/kotlin/g3401_3500/s3463_check_if_digits_are_equal_in_string_after_operations_ii)| Hard | String, Math, Number_Theory, Combinatorics | 38 | 100.00
 | 3462 |[Maximum Sum With at Most K Elements](src/main/kotlin/g3401_3500/s3462_maximum_sum_with_at_most_k_elements)| Medium | Array, Sorting, Greedy, Matrix, Heap_(Priority_Queue) | 139 | 100.00
 | 3461 |[Check If Digits Are Equal in String After Operations I](src/main/kotlin/g3401_3500/s3461_check_if_digits_are_equal_in_string_after_operations_i)| Easy | String, Math, Simulation, Number_Theory, Combinatorics | 3 | 100.00

src/main/kotlin/g3401_3500/s3465_find_products_with_valid_serial_numbers/readme.md

@@ -0,0 +1,73 @@
+[![](https://img.shields.io/github/stars/javadev/LeetCode-in-Kotlin?label=Stars&style=flat-square)](https://github.com/javadev/LeetCode-in-Kotlin)
+[![](https://img.shields.io/github/forks/javadev/LeetCode-in-Kotlin?label=Fork%20me%20on%20GitHub%20&style=flat-square)](https://github.com/javadev/LeetCode-in-Kotlin/fork)
+
+## 3465\. Find Products with Valid Serial Numbers
+
+Easy
+
+Table: `products`
+
+    +--------------+------------+
+    | Column Name  | Type       |
+    +--------------+------------+
+    | product_id   | int        |
+    | product_name | varchar    |
+    | description  | varchar    |
+    +--------------+------------+
+    (product_id) is the unique key for this table.
+    Each row in the table represents a product with its unique ID, name, and description. 
+
+Write a solution to find all products whose description **contains a valid serial number** pattern. A valid serial number follows these rules:
+
+*   It starts with the letters **SN** (case-sensitive).
+*   Followed by exactly `4` digits.
+*   It must have a hyphen (-) **followed by exactly** `4` digits.
+*   The serial number must be within the description (it may not necessarily start at the beginning).
+
+Return _the result table ordered by_ `product_id` _in **ascending** order_.
+
+The result format is in the following example.
+
+**Example:**
+
+**Input:**
+
+products table:
+
+    +------------+--------------+------------------------------------------------------+
+    | product_id | product_name | description                                          |
+    +------------+--------------+------------------------------------------------------+
+    | 1          | Widget A     | This is a sample product with SN1234-5678            |
+    | 2          | Widget B     | A product with serial SN9876-1234 in the description |
+    | 3          | Widget C     | Product SN1234-56789 is available now                |
+    | 4          | Widget D     | No serial number here                                |
+    | 5          | Widget E     | Check out SN4321-8765 in this description            |
+    +------------+--------------+------------------------------------------------------+ 
+
+**Output:**
+
+    +------------+--------------+------------------------------------------------------+
+    | product_id | product_name | description                                          |
+    +------------+--------------+------------------------------------------------------+
+    | 1          | Widget A     | This is a sample product with SN1234-5678            |
+    | 2          | Widget B     | A product with serial SN9876-1234 in the description |
+    | 5          | Widget E     | Check out SN4321-8765 in this description            |
+    +------------+--------------+------------------------------------------------------+ 
+
+**Explanation:**
+
+*   **Product 1:** Valid serial number SN1234-5678
+*   **Product 2:** Valid serial number SN9876-1234
+*   **Product 3:** Invalid serial number SN1234-56789 (contains 5 digits after the hyphen)
+*   **Product 4:** No serial number in the description
+*   **Product 5:** Valid serial number SN4321-8765
+
+The result table is ordered by product\_id in ascending order.
+
+## Solution
+
+```sql
+# Write your MySQL query statement below
+SELECT * FROM products WHERE description REGEXP 'SN[0-9]{4}-[0-9]{4}$'
+OR description REGEXP 'SN[0-9]{4}-[0-9]{4}[^0-9]+' ORDER BY product_id
+```