目录
- 题目
- 答案
- 运行结果
题目
给你一个链表数组,每个链表都已经按升序排列。
请你将所有链表合并到一个升序链表中,返回合并后的链表。
示例 1:
输入:lists = [[1,4,5],[1,3,4],[2,6]]
输出:[1,1,2,3,4,4,5,6]
解释:
链表数组如下:
[
1->4->5,
1->3->4,
2->6
]
将它们合并到一个有序链表中得到。
1->1->2->3->4->4->5->6
示例 2:
输入:lists = []
输出:[]
示例 3:
输入:lists = [[]]
输出:[]
提示:
- k == lists.length
- 0 <= k <= 104
- 0 <= lists[i].length <= 500
- -104 <= lists[i][j] <= 104
- lists[i] 按 升序 排列
- lists[i].length 的总和不超过 104
答案
# Definition for singly-linked list.
# class ListNode(object):
# def __init__(self, val=0, next=None):
# self.val = val
# self.next = next
class Solution(object):def mergeKLists(self, lists):""":type lists: List[ListNode]:rtype: ListNode"""q = []for i in range(len(lists)):while lists[i]:q += lists[i],lists[i] = lists[i].nextroot = cur = ListNode(0)for h in sorted(q, key = lambda x: x.val):cur.next = cur = hreturn root.next