leetcode/MergekSortedLists.cpp at master · jiangshen95/leetcode · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
#include<iostream>
#include<vector>

using namespace std;

struct ListNode{
	int val;
	ListNode *next;
	ListNode(int x):val(x), next(NULL){}
};

class Solution {
public:
    ListNode* mergeKLists(vector<ListNode*>& lists) {
        ListNode *head;
        head=NULL;
        for(int i=0;i<lists.size();i++){
        	head=mergeTwoLists(head,lists.at(i));
		}

		return head;

    }

    ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) {

			if(l1==NULL){
				return l2;
			}
			if(l2==NULL){
				return l1;
			}

			ListNode *p,*q,*head;
			if(l1->val>l2->val){
				head=l2;
				q=l1;
			}else{
				head=l1;
				q=l2;
			}

			p=head;
			ListNode *last,*next;
			while(p->next!=NULL&&q!=NULL){
				cout<<"p: "<<p->val<<endl;
				if(p->val<=q->val&&p->next->val>=q->val){
					cout<<"p: "<<p->val<<"------"<<"q: "<<q->val<<endl;
					last=q;
					while(q->next!=NULL&&p->val<=q->next->val&&p->next->val>=q->next->val){

						q=q->next;
						cout<<"q: "<<q->val<<endl;
					}
					cout<<"q: "<<q->val<<endl;
					next=q;
					q=q->next;
					next->next=p->next;
					p->next=last;
					p=next;
				}
				p=p->next;
			}
			if(p->next==NULL){
				p->next=q;
			}
			return head;
		}
};