867. Transpose Matrix #

题目 #

Given a matrix A, return the transpose of A.

The transpose of a matrix is the matrix flipped over it’s main diagonal, switching the row and column indices of the matrix.

Example 1:

Input: [[1,2,3],[4,5,6],[7,8,9]]
Output: [[1,4,7],[2,5,8],[3,6,9]]

Example 2:

Input: [[1,2,3],[4,5,6]]
Output: [[1,4],[2,5],[3,6]]

Note:

1. 1 <= A.length <= 1000
2. 1 <= A[0].length <= 1000

题目大意 #

给定一个矩阵 A， 返回 A 的转置矩阵。矩阵的转置是指将矩阵的主对角线翻转，交换矩阵的行索引与列索引。

解题思路 #

• 给出一个矩阵，顺时针旋转 90°
• 解题思路很简单，直接模拟即可。

代码 #

package leetcode

func transpose(A [][]int) [][]int {
	row, col, result := len(A), len(A[0]), make([][]int, len(A[0]))
	for i := range result {
		result[i] = make([]int, row)
	}
	for i := 0; i < row; i++ {
		for j := 0; j < col; j++ {
			result[j][i] = A[i][j]
		}
	}
	return result
}