- Note that we don’t need to find the pattern. Just create a new matrix with original matrix’s
cols, and original matrix’s cols as its rows.
Given a 2D integer array matrix, return the
transpose of matrix.
transpose of a matrix is the matrix
flipped over its main diagonal, switching the matrix’s row and column indices.
Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]