Split Linked List in Parts
<p>Given the <code>head</code> of a singly linked list and an integer <code>k</code>, split the linked list into <code>k</code> consecutive linked list parts.</p>

<p>The length of each part should be as equal as possible: no two parts should have a size differing by more than one. This may lead to some parts being null.</p>

<p>The parts should be in the order of occurrence in the input list, and parts occurring earlier should always have a size greater than or equal to parts occurring later.</p>

<p>Return <em>an array of the </em><code>k</code><em> parts</em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/solution/0700-0799/0725.Split%20Linked%20List%20in%20Parts/images/split1-lc.jpg" style="width: 400px; height: 134px;" />
<pre>
<strong>Input:</strong> head = [1,2,3], k = 5
<strong>Output:</strong> [[1],[2],[3],[],[]]
<strong>Explanation:</strong>
The first element output[0] has output[0].val = 1, output[0].next = null.
The last element output[4] is null, but its string representation as a ListNode is [].
</pre>

<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://fastly.jsdelivr.net/gh/doocs/leetcode@main/solution/0700-0799/0725.Split%20Linked%20List%20in%20Parts/images/split2-lc.jpg" style="width: 600px; height: 60px;" />
<pre>
<strong>Input:</strong> head = [1,2,3,4,5,6,7,8,9,10], k = 3
<strong>Output:</strong> [[1,2,3,4],[5,6,7],[8,9,10]]
<strong>Explanation:</strong>
The input has been split into consecutive parts with size difference at most 1, and earlier parts are a larger size than the later parts.
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li>The number of nodes in the list is in the range <code>[0, 1000]</code>.</li>
	<li><code>0 &lt;= Node.val &lt;= 1000</code></li>
	<li><code>1 &lt;= k &lt;= 50</code></li>
</ul>
Linked List
/**
 * Definition for singly-linked list.
 * class ListNode {
 *     val: number
 *     next: ListNode | null
 *     constructor(val?: number, next?: ListNode | null) {
 *         this.val = (val===undefined ? 0 : val)
 *         this.next = (next===undefined ? null : next)
 *     }
 * }
 */

function splitListToParts(head: ListNode | null, k: number): Array<ListNode | null> {
    let n = 0;
    for (let cur = head; cur !== null; cur = cur.next) {
        n++;
    }
    const cnt = (n / k) | 0;
    const mod = n % k;
    const ans: Array<ListNode | null> = Array(k).fill(null);
    let cur = head;
    for (let i = 0; i < k && cur !== null; i++) {
        ans[i] = cur;
        let m = cnt + (i < mod ? 1 : 0);
        for (let j = 1; j < m; j++) {
            cur = cur.next!;
        }
        let next = cur.next;
        cur.next = null;
        cur = next;
    }
    return ans;
}
