[867] Transpose Matrix
https://leetcode.com/problems/transpose-matrix/description/
- algorithms
- Easy (63.17%)
- Source Code: 867.transpose-matrix.py
- Total Accepted: 41.8K
- Total Submissions: 65.5K
- Testcase Example: '[[1,2,3],[4,5,6],[7,8,9]]'
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 <= A.length <= 1000
1 <= A[0].length <= 1000
python
class Solution(object):
def transpose(self, A):
"""
:type A: List[List[int]]
:rtype: List[List[int]]
"""
if not A or not A[0]: return []
m, n = len(A), len(A[0])
ret = [[0 for i in range(m)] for j in range(n)]
for i in range(m):
for j in range(n):
ret[j][i] = A[i][j]
return ret