feat: 2025-10-27打卡

328.odd-even-linked-list.java

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+/*
+ * @lc app=leetcode id=328 lang=java
+ *
+ * [328] Odd Even Linked List
+ */
+
+// @lc code=start
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode() {}
+ *     ListNode(int val) { this.val = val; }
+ *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
+ * }
+ */
+class Solution {
+    public ListNode oddEvenList(ListNode head) {
+        if(head == null || head.next == null) {
+            return head;
+        }
+        ListNode oddDummy = new ListNode(0), oddTail = oddDummy, evenDummy = new ListNode(0), evenTail = evenDummy, cur = head;
+        int i = 1;
+        while(cur != null) {
+            if(i % 2 == 1) {
+                oddTail.next = cur;
+                cur = cur.next;
+                oddTail = oddTail.next;
+                oddTail.next = null;
+            } else {
+                evenTail.next = cur;
+                cur = cur.next;
+                evenTail = evenTail.next;
+                evenTail.next = null;
+            }
+            i++;
+        }
+        oddTail.next = evenDummy.next;
+        return oddDummy.next;
+    }
+}
+// @lc code=end
+