Leetcode-spiral matrix II Spiral Matrix 2 python Dafa good, four lines will be done, you believe?

Spiral Matrix II

Spiral Matrix

Given an integer n, generate a square matrix filled with elements from 1 to n2 in Spiral order.

For example,
Given N = 3 ,

You should return the following matrix:

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

　

It's not easy. Look at the blog Park someone interviewed encountered this problem, long-winded to see me dizzy. Run to the Leetcode discussion area, it seems to see or I Python Dafa, four lines will be done you believe.

| 1 | 2 | 3 |

| 8 | 9 | 4 |

| 7 6 | 5 |

If you don't see it, the general process is like this, and the same color means it's executed in the same step.

>>> def generatematrix (n): ...     A, low = [], n*n+1     ... While low > 1: ...         Low, High = Low-len (A), low ...         A = [List (range low, high)] + list (Zip (*a[::-1))  # python3.3 syntax differs from 2.7         ... Print (A)     ... Return a...>>> Generatematrix (1) [[]][[1]][[1]]>>> Generatematrix (2) [[]][[4]][[3],  (4,)][[1, 2],  (4, 3)][[1, 2], (4, 3)]>>> Generatematrix (3) [[]][[9]][[8],  (9,)][[6, 7],  (9, 8)][[4, 5],  (9, 6),  (8, 7)] [[1, 2, 3],  (8, 9, 4),  (7, 6, 5)][[1, 2, 3], (8, 9, 4), (7, 6, 5)]

Leetcode-spiral matrix II Spiral Matrix 2 python Dafa good, four lines will be done, you believe?