解题思路
本题目的思路与54题的思想相似，套用即可。
代码
class Solution(object):
def generateMatrix(self, n):
"""
:type n: int
:rtype: List[List[int]]
"""
matrix = [[0]*n for _ in range(n)]
rounds = (n+1)//2
t = 1
wide = high = n
for i in range(rounds): #轮次逐层计算
for j in range(4): #表示4个边，我们顺时针计算
if j == 0: #表示上边
for z in range(i,wide - i):
matrix[i][z] = t
t += 1
elif j == 1: #表示右边
for z in range(i + 1,high - i):
matrix[z][wide- i -1] = t
t += 1
elif j == 2 and high - i -1 != i: #下方
for z in range(wide - i - 2,i-1,-1):
matrix[high - i -1][z] = t
t += 1
elif j == 3 and wide - i - 1 != i:
for z in range(high - i - 2,i,-1):
matrix[z][i] = t
t += 1
return matrix
