898. Transpose Matrix

Array Matrix Simulation

Problem - 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.

 

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

Solutions

Python3

class Solution:
    def transpose(self, matrix: List[List[int]]) -> List[List[int]]:
        # return list(zip(*matrix))
        m, n = len(matrix), len(matrix[0])
        result = [[0] * m for _ in range(n)]
        for i in range(m):
            for j in range(n):
                result[j][i] = matrix[i][j]
        return result

Submission Stats:

• Runtime: 0 ms (100.00%)
• Memory: 18.4 MB (92.30%)