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solution.js
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solution.js
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/**
* Definition for singly-linked list.
* function ListNode(val) {
* this.val = val;
* this.next = null;
* }
*/
/**
* @param {ListNode} head
* @param {number} x
* @return {ListNode}
*/
// 拆分链表
var partition = function (head, x) {
if (!head) {
return head;
}
const lessStart = {};
let lastLess = lessStart;
const greaterStart = {};
let lastGreater = greaterStart;
while (head) {
if (head.val < x) {
lastLess.next = head;
lastLess = head;
head = head.next;
lastLess.next = null;
} else {
lastGreater.next = head;
lastGreater = head;
head = head.next;
lastGreater.next = null;
}
}
lastLess.next = greaterStart.next;
return lessStart.next;
};