From 671714fc4736f857977fdb355079bc1d7140ca44 Mon Sep 17 00:00:00 2001
From: Lina <wulinthu@gmail.com>
Date: Wed, 24 Jan 2024 21:23:21 +0000
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---
 problems/0059.螺旋矩阵II.md | 57 +++++++++++++++++++--------------
 1 file changed, 33 insertions(+), 24 deletions(-)

diff --git a/problems/0059.螺旋矩阵II.md b/problems/0059.螺旋矩阵II.md
index 58378ffc..a34af5e3 100644
--- a/problems/0059.螺旋矩阵II.md
+++ b/problems/0059.螺旋矩阵II.md
@@ -138,42 +138,51 @@ public:
 ```Java
 class Solution {
     public int[][] generateMatrix(int n) {
-        int loop = 0;  // 控制循环次数
-        int[][] res = new int[n][n];
-        int start = 0;  // 每次循环的开始点(start, start)
-        int count = 1;  // 定义填充数字
-        int i, j;
+        int[][] nums = new int[n][n];
+        int startX = 0, startY = 0;  // 每一圈的起始点
+        int offset = 1;
+        int count = 1;  // 矩阵中需要填写的数字
+        int loop = 1; // 记录当前的圈数
+        int i, j; // j 代表列, i 代表行;
 
-        while (loop++ < n / 2) { // 判断边界后，loop从1开始
-            // 模拟上侧从左到右
-            for (j = start; j < n - loop; j++) {
-                res[start][j] = count++;
+        while (loop <= n / 2) {
+
+            // 顶部
+            // 左闭右开，所以判断循环结束时， j 不能等于 n - offset
+            for (j = startY; j < n - offset; j++) {
+                nums[startX][j] = count++;
             }
 
-            // 模拟右侧从上到下
-            for (i = start; i < n - loop; i++) {
-                res[i][j] = count++;
+            // 右列
+            // 左闭右开，所以判断循环结束时， i 不能等于 n - offset
+            for (i = startX; i < n - offset; i++) {
+                nums[i][j] = count++;
             }
 
-            // 模拟下侧从右到左
-            for (; j >= loop; j--) {
-                res[i][j] = count++;
+            // 底部
+            // 左闭右开，所以判断循环结束时， j != startY
+            for (; j > startY; j--) {
+                nums[i][j] = count++;
             }
 
-            // 模拟左侧从下到上
-            for (; i >= loop; i--) {
-                res[i][j] = count++;
+            // 左列
+            // 左闭右开，所以判断循环结束时， i != startX
+            for (; i > startX; i--) {
+                nums[i][j] = count++;
             }
-            start++;
+            startX++;
+            startY++;
+            offset++;
+            loop++;
         }
-
-        if (n % 2 == 1) {
-            res[start][start] = count;
+        if (n % 2 == 1) { // n 为奇数时，单独处理矩阵中心的值
+            nums[startX][startY] = count;
         }
-
-        return res;
+        return nums;
     }
 }
+
+
 ```
 
 ### python3: