add 3063

Author: fishercoder1534

Diff for: paginated_contents/algorithms/4th_thousand/README.md

@@ -56,6 +56,7 @@
 | 3074 | [Apple Redistribution into Boxes](https://leetcode.com/problems/apple-redistribution-into-boxes/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3074.java) |                                                                               | Easy       |
 | 3069 | [Distribute Elements Into Two Arrays I](https://leetcode.com/problems/distribute-elements-into-two-arrays-i/)                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3069.java) |                                                                               | Easy       |
 | 3065 | [Minimum Operations to Exceed Threshold Value I](https://leetcode.com/problems/minimum-operations-to-exceed-threshold-value-i/)                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3065.java) |                                                                               | Easy       |
+| 3063 | [Linked List Frequency](https://leetcode.com/problems/linked-list-frequency/)                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3063.java) |                                                                               | Easy       |
 | 3062 | [Winner of the Linked List Game](https://leetcode.com/problems/winner-of-the-linked-list-game/)                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3062.java) |                                                                               | Easy       |
 | 3046 | [Split the Array](https://leetcode.com/problems/split-the-array/)                                                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3046.java) |                                                                               | Easy       |
 | 3042 | [Count Prefix and Suffix Pairs I](https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3042.java) |                                                                               | Easy       |

Diff for: src/main/java/com/fishercoder/solutions/fourththousand/_3063.java

@@ -0,0 +1,25 @@
+package com.fishercoder.solutions.fourththousand;
+
+import com.fishercoder.common.classes.ListNode;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class _3063 {
+    public static class Solution1 {
+        public ListNode frequenciesOfElements(ListNode head) {
+            Map<Integer, Integer> map = new HashMap<>();
+            while (head != null) {
+                map.put(head.val, map.getOrDefault(head.val, 0) + 1);
+                head = head.next;
+            }
+            ListNode pre = new ListNode(-1);
+            ListNode tmp = pre;
+            for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
+                tmp.next = new ListNode(entry.getValue());
+                tmp = tmp.next;
+            }
+            return pre.next;
+        }
+    }
+}