add 3263

Author: fishercoder1534

paginated_contents/algorithms/4th_thousand/README.md

@@ -1,5 +1,6 @@
 | #    | Title                                                                                                                                                               | Solutions                                                                                                                         | Video                                                                         | Difficulty | Tag                                                                  
 |------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------|------------|----------------------------------------------------------------------
+| 3263 | [Convert Doubly Linked List to Array I](https://leetcode.com/problems/convert-doubly-linked-list-to-array-i/)                                                                 | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3263.java) |                                                                               | Easy       |
 | 3258 | [Count Substrings That Satisfy K-Constraint I](https://leetcode.com/problems/count-substrings-that-satisfy-k-constraint-i/)                                                                 | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3258.java) |                                                                               | Easy       |
 | 3254 | [Find the Power of K-Size Subarrays I](https://leetcode.com/problems/find-the-power-of-k-size-subarrays-i/)                                                                 | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3254.java) |                                                                               | Easy       |
 | 3249 | [Count the Number of Good Nodes](https://leetcode.com/problems/count-the-number-of-good-nodes/)                                                                 | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3249.java) |                                                                               | Medium     |

src/main/java/com/fishercoder/solutions/fourththousand/_3263.java

@@ -0,0 +1,23 @@
+package com.fishercoder.solutions.fourththousand;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class _3263 {
+    class Node {
+        public int val;
+        public Node prev;
+        public Node next;
+    }
+
+    public static class Solution1 {
+        public int[] toArray(Node head) {
+            List<Integer> list = new ArrayList<>();
+            while (head != null) {
+                list.add(head.val);
+                head = head.next;
+            }
+            return list.stream().mapToInt(integer -> integer).toArray();
+        }
+    }
+}