update 0349.两个数组的交集.md about rust

problems/0349.两个数组的交集.md

@@ -310,6 +310,22 @@ impl Solution {
 }
 ```
 
+解法2:
+
+```rust
+use std::collections::HashSet;
+impl Solution {
+    pub fn intersection(nums1: Vec<i32>, nums2: Vec<i32>) -> Vec<i32> {
+        nums1
+            .into_iter()
+            .collect::<HashSet<_>>()
+            .intersection(&nums2.into_iter().collect::<HashSet<_>>())
+            .copied()
+            .collect()
+    }
+}
+```
+
 C:
 ```C
 int* intersection1(int* nums1, int nums1Size, int* nums2, int nums2Size, int* returnSize){