feat: 2025-10-24打卡

206.reverse-linked-list.java

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+/*
+ * @lc app=leetcode id=206 lang=java
+ *
+ * [206] Reverse 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 reverseList(ListNode head) {
+        ListNode prev = null, cur = head, t;
+        while(cur != null) {
+            t = cur.next;
+            cur.next = prev;
+            prev = cur;
+            cur = t;
+        }
+        return prev;
+    }
+}
+// @lc code=end
+