Create 0725-split-linked-list-in-parts

java/0725-split-linked-list-in-parts.java

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+class Solution {
+    public ListNode[] splitListToParts(ListNode head, int k) {
+        int numNodes = countNodes(head);
+        ListNode[] ans = new ListNode[k];
+
+        int remainder = numNodes % k;
+        int base_len = numNodes / k;
+        ListNode curr = head;
+
+        for (int i = 0; i < k; i++) {
+            ListNode dummy = new ListNode(0), currHead = dummy;
+            for (int j = 0; j < base_len + (i < remainder ? 1 : 0); j++) {
+                currHead = currHead.next = new ListNode(curr.val);
+                if (curr != null) curr = curr.next;
+            }
+            ans[i] = dummy.next;
+        }
+        return ans;
+    }
+
+    private int countNodes(ListNode root) {
+        int cnt = 0;
+        while (root != null) {
+            cnt++;
+            root = root.next;
+        }
+        return cnt;
+    }
+}