update at 2022-12-03 23:27:52 by ehlxr

budd-common/src/main/java/io/github/ehlxr/algorithm/linkedlist/Palindrome.java

@@ -0,0 +1,85 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright © 2022 xrv <xrv@live.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package io.github.ehlxr.algorithm.linkedlist;
+
+/**
+ * @author ehlxr
+ * @since 2022-12-03 23:11.
+ */
+public class Palindrome {
+    public static class ListNode {
+        int val;
+        ListNode next;
+
+        ListNode() {
+        }
+
+        ListNode(int val) {
+            this.val = val;
+        }
+
+        ListNode(int val, ListNode next) {
+            this.val = val;
+            this.next = next;
+        }
+
+        @Override
+        public String toString() {
+            return "ListNode{" +
+                    "val=" + val +
+                    ", next=" + next +
+                    '}';
+        }
+    }
+
+    public static boolean isPalindrome(ListNode head) {
+        if (head == null) {
+            return false;
+        }
+
+        ListNode slow = head;
+        ListNode fast = head;
+        while (fast != null && fast.next != null) {
+            slow = slow.next;
+            fast = fast.next.next;
+        }
+        System.out.println("中位节点：" + slow);
+
+        return false;
+    }
+
+    public static void main(String[] args) {
+        ListNode head = new ListNode(1);
+        head.next = new ListNode(2);
+        head.next.next = new ListNode(3);
+        head.next.next.next = new ListNode(4);
+        head.next.next.next.next = new ListNode(5);
+        // head.next.next.next.next.next = new ListNode(6);
+
+        System.out.println(head);
+
+        isPalindrome(head);
+    }
+}

budd-demo/src/main/java/io/github/ehlxr/Main.java

@@ -24,6 +24,11 @@
 
 package io.github.ehlxr;
 
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
 /**
  * @author ehlxr
  * @since 2022-01-17 06:31.
@@ -31,12 +36,15 @@ package io.github.ehlxr;
 public class Main {
     public static void main(String[] args) {
         int[][] ns = {
-                { 1, 2, 3, 4 },
-                { 5, 6, 7, 8 },
-                { 9, 10, 11, 12 }
+                {1, 2, 3, 4},
+                {5, 6, 7, 8},
+                {9, 10, 11, 12}
         };
         System.out.println(ns.length); // 3
         System.out.println(ns[0].length); // 4
         System.out.println(ns[2][2]); // 11
+
+
+        List<String> collect = Stream.of("111", "wwwdddd", "dddddd", "12").filter(x -> x.length() > 3).collect(Collectors.toList());
     }
 }