Merge pull request #668 from andywang0607/209_rust

增加0209.长度最小的子数组Rust語言實現

problems/0209.长度最小的子数组.md

@@ -237,6 +237,32 @@ func minSubArrayLen(_ target: Int, _ nums: [Int]) -> Int {
 }
 ```
 
+Rust:
+
+```rust
+impl Solution {
+    pub fn min_sub_array_len(target: i32, nums: Vec<i32>) -> i32 {        
+        let (mut result, mut subLength): (i32, i32) = (i32::MAX, 0);
+        let (mut sum, mut i) = (0, 0);
+        
+        for (pos, val) in nums.iter().enumerate() {
+            sum += val;      
+            while sum >= target {
+                subLength = (pos - i + 1) as i32;
+                if result > subLength {
+                    result = subLength;
+                }
+                sum -= nums[i];
+                i += 1;
+            }
+        }
+        if result == i32::MAX {
+            return 0;
+        }
+        result
+    }
+}
+```
 
 
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