| # | 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|

packagecom.fishercoder.solutions.fourththousand;

importjava.util.ArrayList;

importjava.util.List;

publicclass_3263 {

classNode {

publicintval;

publicNodeprev;

publicNodenext;

}

publicstaticclassSolution1 {

publicint[]toArray(Nodehead) {

List<Integer>list =newArrayList<>();

while (head !=null) {

list.add(head.val);

head =head.next;

}

returnlist.stream().mapToInt(integer ->integer).toArray();

}

}

}