Merge pull request #1677 from Jack-Zhang-1314/patch-7

update [19] 删除链表的倒数第 N 个结点 about rust

problems/0019.删除链表的倒数第N个节点.md

@@ -338,5 +338,28 @@ object Solution {
   }
 }
 ```
+
+Rust:
+```rust
+impl Solution {
+    pub fn remove_nth_from_end(head: Option<Box<ListNode>>, mut n: i32) -> Option<Box<ListNode>> {
+        let mut dummy_head = Box::new(ListNode::new(0));
+        dummy_head.next = head;
+        let mut fast = &dummy_head.clone();
+        let mut slow = &mut dummy_head;
+        while n > 0 {
+            fast = fast.next.as_ref().unwrap();
+            n -= 1;
+        }
+        while fast.next.is_some() {
+            fast = fast.next.as_ref().unwrap();
+            slow = slow.next.as_mut().unwrap();
+        }
+        slow.next = slow.next.as_mut().unwrap().next.take();
+        dummy_head.next
+    }
+}
+```
+
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