题解 | 反转链表

/*
 * function ListNode(x){
 *   this.val = x;
 *   this.next = null;
 * }
 */
/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 *
 * @param head ListNode类
 * @return ListNode类
 */
function ReverseList(head) {
    // write code here
    let prev = null;
    let curr = head;
    while (curr !== null){
        let temp = curr.next;
        curr.next = prev;
        prev = curr;
        curr = temp;
    }
    return prev;
}
module.exports = {
    ReverseList: ReverseList,
};