Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity 1. Naive Solution 思路:直接的想法依次找出列表中的最小项串接起来。 复杂度分析:时间复杂度:O(k*n), 空间复杂度:O(c)。其中 n为最长子列表长度,c为常量。 ListNode *mergeKLists(vector<ListNode *>&l...
next(NULL) {}7* };8*/910structhelper {11ListNode *head;12intlen;13helper(ListNode *h,intl) : head ( h ), len ( l ) {}14};1516classhelpercmp {17public:18booloperator() (consthelper &a,consthelper &b) {19returna.len >b.len;20}21...
def merge2Lists(l1, l2): if l1 is None: return l2 if l2 is None: return l1 if l1.val>l2.val: l2.next = merge2Lists(l1, l2.next) return l2 else: l1.next = merge2Lists(l1.next, l2) return l1 tmp = None for k in range(len(lists)): tmp = merge2Lists(tmp, lists[k]...
ListNode *mergeKLists(vector<ListNode *> &lists) { int n = lists.size(); ListNode *res = new ListNode(-1); if (n<1) return res->next; if (n<2) return lists[0]; ListNode *p = res; int m = 0; for(int i=0;i<n;++i) { if(lists[i]==NULL) { swap(lists[m],lists[i...
2. Solution Version 1 /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */class Solution{public:ListNode*mergeKLists(vector<ListNode*>&lists){intsize=lists.size();if(size==0){returnNULL;...
【leetcode】Merge k Sorted Lists(按大小顺序连接k个链表),题目:Mergeksortedlinkedlistsandreturnitasonesortedlist.Analyzeanddescribeitscomplexity.题意:把k个排序成一个有序链表。用优先队列先把k个链表遍历一遍把值存起来,在建一个新链表吧数从优先队列里一个个
问题2:Kth Smallest Number in M Sorted Lists 这道题目要求找到 M 个已排序列表中第 K 小的数字。如果有重复则视为不同的要素,如果input为空则返回零,如果input的总元素不足k,则返回最后一个最大的元素。在leetcode中是一道median难度的题。 一种解决这个问题的方法是使用最小堆(Min Heap)。解题思路: ...
class Solution { public: void heapify(vector<int> &arr, int i, int n) { int largest = i; int left = 2 * i + 1; int right = 2 * i + 2; if (left < n && arr[left] > arr[largest]) { largest = left; } if (right < n && arr[right] > arr[largest]) { largest = ...
Can you solve this real interview question? Merge k Sorted Lists - You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the linked-lists into one sorted linked-list and return it. Example 1: Inpu
Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity. 合并k个有序的链表,我们假设每个链表的平均长度是n。这一题需要用到合并两个有序的链表子过程 算法1: 最傻的做法就是先1、2合并,12结果和3合并,123结果和4合并,…,123..k-1结果和k合并,我们计算一下...