传送门

个人版视频笔记 https://www.bilibili.com/video/BV1KS4y1a7xA/

代码参考自 https://www.acwing.com/solution/content/57352/

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode* quickSortList(ListNode* head) {
        if(head == NULL) return head;
        quick_sort(head, NULL);
        return head;
    }

    void quick_sort(ListNode *head, ListNode *tail)
    {
        if(head != tail)
        {
            int key = head -> val;
            auto p = head, q = head->next;
            while(q != tail)
            {
                if(q->val < key)
                {
                    p = p->next;
                    swap(p->val, q->val);
                }
                q = q->next;
            }

            if(head != p)
            {
                swap(head->val, p->val);
            }

            quick_sort(head, p);
            quick_sort(p->next, tail);
        }
    }
};