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- /**
- * 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 reverseList(head: ListNode | null): ListNode | null {
- let prev: ListNode | null = null;
- let curr = head;
- while (curr) {
- let next = curr.next;
- curr.next = prev;
- prev = curr;
- curr = next;
- }
- return prev;
- };
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