From bb277e08e19b797a1b5da5bfe0c60ef84b5c9c8e Mon Sep 17 00:00:00 2001
From: K-945 <393763635@qq.com>
Date: Sun, 20 Feb 2022 17:56:21 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A00059.=E8=9E=BA=E6=97=8B?=
 =?UTF-8?q?=E7=9F=A9=E9=98=B5II.md=20=E5=92=8C=E8=A7=A3=E6=9E=90=E7=9B=B8?=
 =?UTF-8?q?=E5=90=8C=E7=9A=84python=E7=89=88?=
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---
 problems/0059.螺旋矩阵II.md | 60 ++++++++++++---------------------
 1 file changed, 22 insertions(+), 38 deletions(-)

diff --git a/problems/0059.螺旋矩阵II.md b/problems/0059.螺旋矩阵II.md
index 3f7a59ca..a98e72ad 100644
--- a/problems/0059.螺旋矩阵II.md
+++ b/problems/0059.螺旋矩阵II.md
@@ -192,47 +192,31 @@ python:
 
 ```python3
 class Solution:
-
     def generateMatrix(self, n: int) -> List[List[int]]:
-        # 初始化要填充的正方形
-        matrix = [[0] * n for _ in range(n)]
+        nums = [[0] * n for _ in range(n)]
+        startx, starty = 0, 0               # 起始点
+        loop, mid = n // 2, n // 2          # 迭代次数、n为奇数时，矩阵的中心点
+        count = 1                           # 计数
 
-        left, right, up, down = 0, n - 1, 0, n - 1
-        number = 1  # 要填充的数字
+        for offset in range(1, loop + 1) :      # 每循环一层偏移量加1，偏移量从1开始
+            for i in range(starty, n - offset) :    # 从左至右，左闭右开
+                nums[startx][i] = count
+                count += 1
+            for i in range(startx, n - offset) :    # 从上至下
+                nums[i][n - offset] = count
+                count += 1
+            for i in range(n - offset, starty, -1) : # 从右至左
+                nums[n - offset][i] = count
+                count += 1
+            for i in range(n - offset, startx, -1) : # 从下至上
+                nums[i][starty] = count
+                count += 1                
+            startx += 1         # 更新起始点
+            starty += 1
 
-        while left < right and up < down:
-
-            # 从左到右填充上边
-            for x in range(left, right):
-                matrix[up][x] = number
-                number += 1
-
-            # 从上到下填充右边
-            for y in range(up, down):
-                matrix[y][right] = number
-                number += 1
-
-            # 从右到左填充下边
-            for x in range(right, left, -1):
-                matrix[down][x] = number
-                number += 1
-
-            # 从下到上填充左边
-            for y in range(down, up, -1):
-                matrix[y][left] = number
-                number += 1
-
-            # 缩小要填充的范围
-            left += 1
-            right -= 1
-            up += 1
-            down -= 1
-
-        # 如果阶数为奇数，额外填充一次中心
-        if n % 2:
-            matrix[n // 2][n // 2] = number
-
-        return matrix
+        if n % 2 != 0 :			# n为奇数时，填充中心点
+            nums[mid][mid] = count 
+        return nums
 ```
 
 javaScript