82:删除排序链表中的重复元素 II

src/main/java/leetcode/editor/cn/RemoveDuplicatesFromSortedListIi.java

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+//存在一个按升序排列的链表，给你这个链表的头节点 head ，请你删除链表中所有存在数字重复情况的节点，只保留原始链表中 没有重复出现 的数字。 
+//
+// 返回同样按升序排列的结果链表。 
+//
+// 
+//
+// 示例 1： 
+//
+// 
+//输入：head = [1,2,3,3,4,4,5]
+//输出：[1,2,5]
+// 
+//
+// 示例 2： 
+//
+// 
+//输入：head = [1,1,1,2,3]
+//输出：[2,3]
+// 
+//
+// 
+//
+// 提示： 
+//
+// 
+// 链表中节点数目在范围 [0, 300] 内 
+// -100 <= Node.val <= 100 
+// 题目数据保证链表已经按升序排列 
+// 
+// Related Topics 链表 
+// 👍 628 👎 0
+
+package leetcode.editor.cn;
+
+import com.code.leet.entiy.ListNode;
+
+//82:删除排序链表中的重复元素 II
+public class RemoveDuplicatesFromSortedListIi{
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new RemoveDuplicatesFromSortedListIi().new Solution();
+    }
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+/**
+ * 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 deleteDuplicates(ListNode head) {
+        if (head == null || head.next == null) {
+            return head;
+        }
+        ListNode front = new ListNode(-1);
+        ListNode temp = front;
+        int same = head.val;
+        boolean flag = false;
+        while (head.next != null) {
+            if (head.val == head.next.val) {
+                head.next = head.next.next;
+                same = head.val;
+                flag = true;
+            } else if (flag && head.val == same) {
+                head = head.next;
+            } else {
+                temp.next = head;
+                temp = temp.next;
+                head = head.next;
+            }
+        }
+        if (head.val == same) {
+            temp.next = null;
+        } else {
+            temp.next = head;
+        }
+        return front.next;
+    }
+}
+//leetcode submit region end(Prohibit modification and deletion)
+
+}

src/main/java/leetcode/editor/cn/RemoveDuplicatesFromSortedListIi.md

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+<p>存在一个按升序排列的链表，给你这个链表的头节点 <code>head</code> ，请你删除链表中所有存在数字重复情况的节点，只保留原始链表中 <strong>没有重复出现</strong><em> </em>的数字。</p>
+
+<p>返回同样按升序排列的结果链表。</p>
+
+<p> </p>
+
+<p><strong>示例 1：</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/01/04/linkedlist1.jpg" style="width: 500px; height: 142px;" />
+<pre>
+<strong>输入：</strong>head = [1,2,3,3,4,4,5]
+<strong>输出：</strong>[1,2,5]
+</pre>
+
+<p><strong>示例 2：</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/01/04/linkedlist2.jpg" style="width: 500px; height: 205px;" />
+<pre>
+<strong>输入：</strong>head = [1,1,1,2,3]
+<strong>输出：</strong>[2,3]
+</pre>
+
+<p> </p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li>链表中节点数目在范围 <code>[0, 300]</code> 内</li>
+	<li><code>-100 <= Node.val <= 100</code></li>
+	<li>题目数据保证链表已经按升序排列</li>
+</ul>
+<div><div>Related Topics</div><div><li>链表</li></div></div>\n<div><li>👍 628</li><li>👎 0</li></div>