添加 0203.移除链表元素 0344.反转字符串 0376.摆动序列 0541.反转字符串II 剑指Offer05.替换空格 Rust版本

添加 0203.移除链表元素 0344.反转字符串 0376.摆动序列 0541.反转字符串II 剑指Offer05.替换空格 Rust版本

problems/0203.移除链表元素.md

@@ -487,17 +487,19 @@ RUST:
 // }
 impl Solution {
     pub fn remove_elements(head: Option<Box<ListNode>>, val: i32) -> Option<Box<ListNode>> {
-        let mut head = head;
-        let mut dummy_head = ListNode::new(0);
-        let mut cur = &mut dummy_head;
-        while let Some(mut node) = head {
-            head = std::mem::replace(&mut node.next, None);
-            if node.val != val {
-                cur.next = Some(node);
+        let mut dummyHead = Box::new(ListNode::new(0));
+        dummyHead.next = head;
+        let mut cur = dummyHead.as_mut();
+	// 使用take()替换std::men::replace(&mut node.next, None)达到相同的效果，并且更普遍易读
+        while let Some(nxt) = cur.next.take() {
+            if nxt.val == val {
+                cur.next = nxt.next;
+            } else {
+                cur.next = Some(nxt);
                 cur = cur.next.as_mut().unwrap();
             }
         }
-        dummy_head.next
+        dummyHead.next
     }
 }
 ```