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Leetcode19.cpp
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115 lines (93 loc) · 2.46 KB
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// Leetcode19.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* removeNthFromEnd(ListNode* head, int n)
{
vector<ListNode*> pNode;
ListNode* temp = head;
while (temp)
{
pNode.push_back(temp);
temp = temp->next;
}
if (0 == pNode.size() - n)
{
head = head->next;
}
else
{
pNode[pNode.size() - n - 1]->next = pNode[pNode.size() - n]->next;
}
return head;
}
ListNode* removeNthFromEndBetter(ListNode* head, int n)
{
ListNode* first = head, * second = head;
int i;
for (i = 0; i < n; ++i)
{
if (!first->next)
break;
first = first->next;
}
if (i != n)
{
head = head->next;
return head;
}
while (first->next)
{
first = first->next;
second = second->next;
}
second->next = second->next->next;
return head;
}
int main()
{
vector<int> data = { 1};
int n = 1;
ListNode* head = listCreate(data);
//head = removeNthFromEnd(head, n);
head = removeNthFromEndBetter(head, n);
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