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Java-based LeetCode algorithm problem solutions, regularly updated
867\. Transpose Matrix
Easy
Given a 2D integer array `matrix`, return _the **transpose** of_ `matrix`.
The **transpose** of a matrix is the matrix flipped over its main diagonal, switching the matrix's row and column indices.
![](https://assets.leetcode.com/uploads/2021/02/10/hint_transpose.png)
**Example 1:**
**Input:** matrix = [[1,2,3],[4,5,6],[7,8,9]]
**Output:** [[1,4,7],[2,5,8],[3,6,9]]
**Example 2:**
**Input:** matrix = [[1,2,3],[4,5,6]]
**Output:** [[1,4],[2,5],[3,6]]
**Constraints:**
* `m == matrix.length`
* `n == matrix[i].length`
* `1 <= m, n <= 1000`
* 1 <= m * n <= 105
* -109 <= matrix[i][j] <= 109