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idk why these stuffs get stashed for so long and I didn't ever commit them

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綾瀬桃桃
2025-11-06 09:43:54 +08:00
parent 5dbdfef1a1
commit e01c041259
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138
Chapter2/2-5-ReverseLinkList/2-5-ReverseLinkList.vcxproj Normal file
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Chapter2/2-5-ReverseLinkList/2-5-ReverseLinkList.vcxproj.filters Normal file
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Chapter2/2-5-ReverseLinkList/LinkList.h Normal file
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template <class DT>
struct LNode //链表结点
{
DT data; //数据域，存储数据元素值
LNode* next; //指针域，指向下一个结点
};
//【算法2.14】 创建空单链表
template <class DT>
bool InitList(LNode<DT>*& L)
{
L = new LNode<DT>; // 1.创建头结点
if (!L) exit(1); // 2.创建失败，退出
L->next = NULL; // 3.创建成功
return true; // 返回true
}
//【算法2.15】 尾插法创建n的元素
template <class DT>
bool CreateList_1(LNode<DT>*& L, int n)
{
LNode<DT>* p, * s;
p = L; //1.工作指针初始化，指向尾结点
cout << "依次输入" << n << "个数据元素：" << endl;
for (int i = 1; i <= n; i++) // 2.按元素位序正序创建各结点
{
s = new LNode<DT>; // 2.1 新建一个结点s
if (!s) // 2.2 创建失败，返回false
return false;
cin >> s->data; // 2.3 输入结点值
s->next = p->next; // 2.4 s 链在表尾
p->next = s;
p = s; // 2.5 工作指针指向 s
}
return true; // 3.创建成功，返回true
}
//【算法2.16】 头插法创建n个元素
template <class DT>
bool CreateList_2(LNode<DT>* (&L), int n)
{
LNode<DT>* s;
cout << "逆序输入" << n << "个数据元素：" << endl;
for (int i = 1; i <= n; i++) // 1.按元素位序逆序创建各结点
{
s = new LNode<DT>; // 1.1 新建一个结点 s
if (!s) // 1.2 创建失败，返回false
return false;
cin >> s->data; // 1.3 输入结点值
s->next = L->next; // 1.4 s 在头结点后
L->next = s;
}
return true; // 1.创建成功，返回true
}
//【算法2.17】
template <class DT>
void DestroyList(LNode<DT>* (&L)) // 释放链表所占空间
{
LNode<DT>* p;
while (L) // 1. 表非空,从头结点开始，依次释放结点
{
p = L; // 1.1 处理表头结点
L = L->next; // 1.2 头指针后移
delete p; // 1.3 释放表头结点所占内存
}
L = NULL; // 2.头指针指向空
}
//【算法2.18】 获取第i个元素
template<class DT>
bool GetElem_i(LNode<DT>* L, int i, DT& e)
{
LNode<DT>* p; // 1.初始化
p = L->next; // 1.1 设置工作指针，从首结点开始，数结点
int j = 1; // 1.2 计数器初始化
while (p && j < i) // 2.定位到第i个元素结点
{
p = p->next; j++;
}
if (!p || j > i) // 3 未找到，返回false
return false;
else // 4. 找到
{
e = p->data; // 获取第i个元素值
return true; // 返回true
}
}
//【算法2.19】 查找值为e的元素位序
template<class DT>
int LocateElem_e(LNode<DT>* L, DT e)
{
LNode<DT>* p; // 1.初始化从首元开始查找
p = L->next; // 1.1从首元开始查找
int j = 1; // 1.2 计数器初值
while (p && p->data != e) // 2.顺序查找
{
p = p->next; // 2.1未找到指针后移
j++; // 2.2 计数器增1
}
if (p == NULL) // 3. 判断是否找到
return 0; // 3.1末找到，返回0
else
return j; // 3.2 找到，返回位序
}
//【算法2.20】 插入第i个元素
template<class DT>
bool InsertElem_i(LNode<DT>* (&L), int i, DT e)
{
int j = 0;
LNode<DT>* p; // 1.初始化
p = L; // 工作指针初始化
while (p && j < i - 1) // 2. 定位到插入点前驱
{
p = p->next;//
j++;
}
if (!p || j > i - 1) // 3.判断定位是否成功：
return false; // 3.1 定位失败，不能插入
else // 3.2 定位成功
{
LNode<DT>* s;
s = new LNode<DT>; // 3.2.1建立新结点
s->data = e; // 3.2.2新结点赋值
s->next = p->next; // 3.2.3结点S链接到p结点之后
p->next = s;
return true; // 3.2.4 插入成功，返回true
}
}
//【算法2.21】 删除第i个元素
template<class DT>
bool DeleElem_i(LNode<DT>* (&L), int i)
{
LNode<DT>* p, * q; //1.初始化：设置工作指针
p = L; //查找从头结点开始
int j = 0; //计数器初始化
while (p->next && j < i - 1) //2.p定位到删除点的前驱
{
p = p->next; //
j++;
}
if (!p->next || j > i - 1) //3.删除位置不合理，不能删除
return false; //返回false
else //4.删除操作
{
q = p->next; //4.1暂存删除结点位置
p->next = q->next; //4.2从链表中摘除删除结点
delete q;
return true; //4.3删除成功，返回true
}
}
//【算法2.22】 修改第i个元素值
template<class DT>
bool PutElem_i(LNode<DT>* (&L), int i, DT e)
{
LNode<DT>* p; // 1.初始化:设置工作指针
p = L->next; // 从首结点开始，数结点
int j = 1; // 计数器初始化
while (p && j < i) // 2.查找第i个元素结点
{
p = p->next; j++;
}
if (!p || j > i) // 3.元素不存在,返回false
return false;
else // 4.定位成功
{
p->data = e; // 修改元素值
return true; // 返回true
}
}
// 释放链表所占空间
template<class DT>
void ClearList(LNode<DT>* (&L))
{
LNode<DT>* p;
while (L->next) // 从首元结点开始，依次释放结点
{
p = L->next;
L->next = p->next;
delete p;
}
cout << endl << "表已清空!" << endl;
}
//【算法2.23】 测表长
template<class DT>
int ListLength(LNode<DT>* L)
{ // 1.初始化
int len = 0; // 1.1 结点计数器赋初值0
LNode<DT>* p; // 1.2设置工作指针
p = L; // 指向头结点
while (p->next) // 2.数结点个数。有后继结点，
{
len++; p = p->next; // 结点数增1，指针后移
}
return len; // 3.返回表长
}
//
template<class DT>
bool ListEmpty(LNode<DT>* L) //测表空
{
if (L->next == NULL)
return true; //空表，返回1
else
return false; //不空，返回0
}
//【算法2.24】 遍历表
template <class DT>
void DispList(LNode<DT>* L) // 显示表内容
{
LNode<DT>* p; // 1. 设置工作指针
p = L->next; // 从首元结点开始遍历
while (p) // 2.依次输出各结点值
{
cout << p->data << "\t";
p = p->next;
}
cout << endl;
}

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Chapter2/2-5-ReverseLinkList/ReverseLinkList.cpp Normal file
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#include<iostream> //cout,cin
using namespace std;
#include "LinkList.h"
//算法2.25 单链表逆置
void ReverseLinkList(LNode<int>*& L)
{
LNode<int>* p, * q; // 1.设置工作指针
p = L->next; // 原链表头结点，作为逆置后表的头结点
L->next = NULL;
while (p) // 2. 依次摘除原链表结点，以头插法插入到逆置链表中
{
q = p; // 2.1 q取当前结点位置
p = p->next; // 2.2 p指向下一个待处理结点
q->next = L->next; // 2.3 将q 插入到头结点之后
L->next = q;
}
}
void dispmenu()
{//显示主菜单
cout << endl;
cout << "1-创建单链表\n";
cout << "2-逆置单链表\n";
cout << "3-显示单链表\n";
cout << "4-退出\n";
}
char pause;
//主函数
int main()
{
int n;
//int e;
LNode<int>* L;
system("cls"); // 执行系统命令cls，清屏
int choice;
do
{
dispmenu(); // 显示主菜单
cout << "Enter choice(1~4):";
cin >> choice;
switch (choice)
{
case 1: // 创建单链表
InitList(L);
cout << "输入要创建元素个数:";
cin >> n;
cout << endl;
CreateList_1(L, n);
cout << "创建的单链表为：";
DispList(L);
cout << endl;
break;
case 2: // 逆置单链表
ReverseLinkList(L);
cout << "逆置后的单链表为：";
DispList(L);
cout << endl;
break;
case 3: // 显示表
DispList(L);
cout << endl;
cin.get(pause);
system("pause");
break;
case 4: // 退出
DestroyList(L);
cout << "结束运行" << endl;
break;
default: // 无效选择
cout << "Invalid choice\n";
break;
}
} while (choice != 4);
return 0;
}//end of main function