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Diffstat (limited to 'diagonal_traverse.py')
-rw-r--r-- | diagonal_traverse.py | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/diagonal_traverse.py b/diagonal_traverse.py new file mode 100644 index 0000000..d75deec --- /dev/null +++ b/diagonal_traverse.py @@ -0,0 +1,43 @@ +# 498. Diagonal Traverse + +""" +given an 'm x n' matrix 'mat', return an array of all the elements of the +array in a diagonal order. +""" + + +class Solution(object): + def findDiagonalOrder(self, mat): + """ + :type mat: List[List[int]] + :rtype: List[int] + """ + if not mat or not mat[0]: + return [] + m, n = len(mat), len(mat[0]) + ans, row, col = [], 0, 0 + for _ in range(m * n): + ans.append(mat[row][col]) + if (row + col) % 2 == 0: + if col == n - 1: + row += 1 + elif row == 0: + col += 1 + else: + row -= 1 + col += 1 + else: + if row == m - 1: + col += 1 + elif col == 0: + row += 1 + else: + row += 1 + col -= 1 + return ans + + +if __name__ == "__main__": + obj = Solution() + print(obj.findDiagonalOrder(mat=[[1, 2, 3], [4, 5, 6], [7, 8, 9]])) + print(obj.findDiagonalOrder(mat=[[1, 2], [3, 4]])) |