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54 lines (49 loc) · 1.02 KB
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//
// main.cpp
// leetcode021
//
// Created by 萧天牧 on 17/2/27.
// Copyright © 2017年 萧天牧. All rights reserved.
//
#include <iostream>
struct ListNode {
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
using namespace std;
ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) {
if (l1 == NULL && l2 == NULL) {
return NULL;
}
if (l1 == NULL) {
return l2;
}
if (l2 == NULL) {
return l1;
}
ListNode* p = new ListNode(0);
ListNode* head = p;
while(l1 != NULL && l2 != NULL){
if(l1->val < l2 ->val){
p->next = l1;
p = p -> next;
l2 = l2 -> next;
}
else {
p->next = l2;
p = p -> next;
l1 = l1 -> next;
}
}
if(l1 != NULL)
p->next = l1;
else
p->next = l2;
return head->next;
}
int main(int argc, const char * argv[]) {
// insert code here...
std::cout << "Hello, World!\n";
return 0;
}