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Leetcode21.cpp
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119 lines (98 loc) · 2.7 KB
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// Leetcode21.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
using namespace::std;
struct ListNode
{
int val;
ListNode* next;
ListNode() : val(0), next(nullptr) {}
ListNode(int x) : val(x), next(nullptr) {}
ListNode(int x, ListNode* next) : val(x), next(next) {}
};
ListNode* listCreate(vector<int>& v)
{
ListNode* p = nullptr, * t = nullptr;
for (auto vi : v)
{
//int a = 1;
//int* pa = &a;
ListNode* node = new ListNode(vi);
//ListNode node = ListNode(vi);
if (p == nullptr)
p = node;
if (t == nullptr)
t = node;
else
{
t->next = node;
t = node;
}
}
return p;
}
ListNode* mergeTwoLists(ListNode* list1, ListNode* list2)
{
if (list1 == nullptr)
return list2;
if (list2 == nullptr)
return list1;
ListNode* head = nullptr, * headTmp = nullptr;
ListNode* temp1 = list1, * temp2 = list2;
if (list1->val <= list2->val)
{
head = list1;
headTmp = list1;
temp1 = temp1->next;
}
else
{
head = list2;
headTmp = list2;
temp2 = temp2->next;
}
while (temp1 != nullptr || temp2 != nullptr)
{
int val1, val2;
if (temp1 == nullptr)
val1 = 120;
else
val1 = temp1->val;
if (temp2 == nullptr)
val2 = 120;
else
val2 = temp2->val;
if (val1 <= val2)
{
headTmp->next = temp1;
headTmp = headTmp->next;
temp1 = temp1->next;
}
else
{
headTmp->next = temp2;
headTmp = headTmp->next;
temp2 = temp2->next;
}
}
return head;
}
int main()
{
vector<int> vi1 = { };
vector<int> vi2 = {1 };
ListNode* pl1 = listCreate(vi1);
ListNode* pl2 = listCreate(vi2);
ListNode* res = mergeTwoLists(pl1, pl2);
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file