203:移除链表元素

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

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+//给你一个链表的头节点 head 和一个整数 val ，请你删除链表中所有满足 Node.val == val 的节点，并返回 新的头节点 。
+// 
+//
+// 示例 1： 
+//
+// 
+//输入：head = [1,2,6,3,4,5,6], val = 6
+//输出：[1,2,3,4,5]
+// 
+//
+// 示例 2： 
+//
+// 
+//输入：head = [], val = 1
+//输出：[]
+// 
+//
+// 示例 3： 
+//
+// 
+//输入：head = [7,7,7,7], val = 7
+//输出：[]
+// 
+//
+// 
+//
+// 提示： 
+//
+// 
+// 列表中的节点在范围 [0, 104] 内 
+// 1 <= Node.val <= 50 
+// 0 <= k <= 50 
+// 
+// Related Topics 链表 
+// 👍 613 👎 0
+
+package leetcode.editor.cn;
+
+import com.code.leet.entiy.ListNode;
+
+//203:移除链表元素
+class RemoveLinkedListElements{
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new RemoveLinkedListElements().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 removeElements(ListNode head, int val) {
+        ListNode temp = head;
+        if (temp == null) {
+            return head;
+        }
+        while (temp.val == val) {
+            head = temp = temp.next;
+            if (temp == null) {
+                return head;
+            }
+        }
+        while (temp != null && temp.next != null) {
+            if (temp.next.val == val) {
+                temp.next = temp.next.next;
+            } else {
+                temp = temp.next;
+            }
+        }
+        return head;
+
+    }
+}
+//leetcode submit region end(Prohibit modification and deletion)
+
+}

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

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+给你一个链表的头节点 <code>head</code> 和一个整数 <code>val</code> ，请你删除链表中所有满足 <code>Node.val == val</code> 的节点，并返回 <strong>新的头节点</strong> 。
+<p> </p>
+
+<p><strong>示例 1：</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/03/06/removelinked-list.jpg" style="width: 500px; height: 142px;" />
+<pre>
+<strong>输入：</strong>head = [1,2,6,3,4,5,6], val = 6
+<strong>输出：</strong>[1,2,3,4,5]
+</pre>
+
+<p><strong>示例 2：</strong></p>
+
+<pre>
+<strong>输入：</strong>head = [], val = 1
+<strong>输出：</strong>[]
+</pre>
+
+<p><strong>示例 3：</strong></p>
+
+<pre>
+<strong>输入：</strong>head = [7,7,7,7], val = 7
+<strong>输出：</strong>[]
+</pre>
+
+<p> </p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li>列表中的节点在范围 <code>[0, 10<sup>4</sup>]</code> 内</li>
+	<li><code>1 <= Node.val <= 50</code></li>
+	<li><code>0 <= k <= 50</code></li>
+</ul>
+<div><div>Related Topics</div><div><li>链表</li></div></div>\n<div><li>👍 613</li><li>👎 0</li></div>

src/main/java/leetcode/editor/cn/RemoveLinkedListElements144362264.txt

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+/**
+ * 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 removeElements(ListNode head, int val) {
+        ListNode temp = head;
+        if (temp == null) {
+            return head;
+        }
+        while (temp.val == val) {
+            head = temp = temp.next;
+            if (temp == null) {
+                return head;
+            }
+        }
+        while (temp != null && temp.next != null) {
+            if (temp.next.val == val) {
+                temp.next = temp.next.next;
+            } else {
+                temp = temp.next;
+            }
+        }
+        return head;
+    }
+}
+//runtime:1 ms
+//memory:39.4 MB