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Kotlin-based LeetCode algorithm problem solutions, regularly updated
2888\. Reshape Data: Concatenate
Easy
DataFrame `df1`
+-------------+--------+
| Column Name | Type |
+-------------+--------+
| student_id | int |
| name | object |
| age | int |
+-------------+--------+
DataFrame `df2`
+-------------+--------+
| Column Name | Type |
+-------------+--------+
| student_id | int |
| name | object |
| age | int |
+-------------+--------+
Write a solution to concatenate these two DataFrames **vertically** into one DataFrame.
The result format is in the following example.
**Example 1:**
**Input: df1**
+------------+---------+-----+
| student_id | name | age |
+------------+---------+-----+
| 1 | Mason | 8 |
| 2 | Ava | 6 |
| 3 | Taylor | 15 |
| 4 | Georgia | 17 |
+------------+---------+-----+
**df2**
+------------+------+-----+
| student_id | name | age |
+------------+------+-----+
| 5 | Leo | 7 |
| 6 | Alex | 7 |
+------------+------+-----+
**Output:**
+------------+---------+-----+
| student_id | name | age |
+------------+---------+-----+
| 1 | Mason | 8 |
| 2 | Ava | 6 |
| 3 | Taylor | 15 |
| 4 | Georgia | 17 |
| 5 | Leo | 7 |
| 6 | Alex | 7 |
+------------+---------+-----+
**Explanation:** The two DataFramess are stacked vertically, and their rows are combined.