2022-0102: 0209 add ruby version

problems/0209.长度最小的子数组.md

@@ -121,7 +121,6 @@ public:
 
 
 
-
 ## 其他语言版本
 
 
@@ -291,5 +290,23 @@ class Solution {
 }
 ```
 
+Ruby:
+
+```ruby
+def min_sub_array_len(target, nums)
+  res = Float::INFINITY # 无穷大
+  i, sum = 0, 0
+  nums.length.times do |j|
+    sum	+= nums[j]
+    while sum >= target
+      res = [res, j - i + 1].min
+      sum -= nums[i]
+      i	+= 1
+    end
+  end
+  res == Float::INFINITY ? 0 : res
+end
+```
+
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