Merge pull request youngyangyang04#2206 from niuli1991/master

添加0059.螺旋矩阵II Ruby实现

problems/0059.螺旋矩阵II.md

@@ -688,6 +688,58 @@ public class Solution {
 }
 ```
 
+### Ruby#:
+```ruby
+def generate_matrix(n)
+  result = Array.new(n) { Array.new(n, 0) }
+  #循环次数
+  loop_times = 0
+  #步长
+  step = n - 1
+  val = 1
+
+
+  while loop_times < n / 2
+    #模拟从左向右
+    for i in 0..step - 1
+      #行数不变，列数变
+      result[loop_times][i+loop_times] = val
+      val += 1
+    end
+
+    #模拟从上到下
+    for i in 0..step - 1
+      #列数不变，行数变
+      result[i+loop_times][n-loop_times-1] = val
+      val += 1
+    end
+
+    #模拟从右到左
+    for i in 0..step - 1
+      #行数不变，列数变
+      result[n-loop_times-1][n-loop_times-i-1] = val
+      val += 1
+    end
+
+    #模拟从下到上
+    for i in 0..step - 1
+      #列数不变，行数变
+      result[n-loop_times-i-1][loop_times] = val
+      val += 1
+    end
+
+    loop_times += 1
+    step -= 2
+  end
+
+  #如果是奇数，则填充最后一个元素
+  result[n/2][n/2] = n**2 if n % 2
+
+  return result
+
+end
+```
+
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