feat: 2025-10-27打卡

86.partition-list.java

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+/*
+ * @lc app=leetcode id=86 lang=java
+ *
+ * [86] Partition 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 partition(ListNode head, int x) {
+        ListNode tf = new ListNode(0), 
+        tb = new ListNode(0);
+        tf.next = null;
+        tb.next = null;
+        ListNode cur = head, tailf = tf, tailb = tb;
+        while(cur != null) {
+            if(cur.val < x) {
+                tailf.next = cur;
+                cur = cur.next;
+                tailf = tailf.next;
+                tailf.next = null;
+            } else {
+                tailb.next = cur;
+                cur = cur.next;
+                tailb = tailb.next;
+                tailb.next = null;
+            }
+        }
+        tailf.next = tb.next;
+        return tf.next;
+    }
+}
+// @lc code=end
+