diff --git a/线性表/链式实现大题/P42.16.cpp b/线性表/链式实现大题/P42.16.cpp
new file mode 100644
index 0000000..b58cc19
--- /dev/null
+++ b/线性表/链式实现大题/P42.16.cpp
@@ -0,0 +1,124 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P42.16
+//两个整数序列A = a1,a2,a3…, an和B = b1, b2, b3, …, bn已经存入两个单链表中, 设计
+//个算法, 判断序列B是否是序列A的连续子序列
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	list = list->next;
+	while (list != NULL) {
+		printf("%d ", list->data);
+		list = list->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+#pragma endregion
+
+
+//P42.16
+
+bool Subsequences(LinkList& A, LinkList& B) {
+	LinkList pa = A->next, pb = B->next, pre = pa;
+	while (pa && pb) {
+		if (pa->data == pb->data) {
+			pa = pa->next;
+			pb = pb->next;
+		}
+		else {
+			pre = pre->next;
+			pa = pre;
+			pb = B->next;
+		}
+	}
+	if (!pb)
+		return true;
+	else
+		return false;
+}
+
+int main()
+{
+	cout << "输入数据:" << endl;
+	vector<int> data1{ 1,3,5,7,9,11 };
+	vector<int> data2{ 3,5,7,9 };
+	LinkList A;
+	InitList(A);
+	LinkList B;
+	InitList(B);
+	A = CreatList(data1);
+	B = CreatList(data2);
+	PrintList(A);
+	PrintList(B);
+	cout << "测试结果:" << endl;
+	if (Subsequences(A, B)) {
+		cout << "序列B是序列A的连续子序列" << endl;
+	}
+	else {
+		cout << "序列B不是序列A的连续子序列" << endl;
+	}
+	return 0;
+}
diff --git a/线性表/链式实现大题/P42.17.cpp b/线性表/链式实现大题/P42.17.cpp
new file mode 100644
index 0000000..a365f37
--- /dev/null
+++ b/线性表/链式实现大题/P42.17.cpp
@@ -0,0 +1,119 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P42.17
+//设计一个算法用于判断带头结点的循环双链表是否对称
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的循环双链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next, * prior;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = L;
+	L->prior = L;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == L);
+}
+
+//判断结点P是否为表尾结点
+bool IsTail(LinkList L, LNode* p) {
+	return (p->next == L);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		s->prior = p;
+		p->next = s;
+		p = s;
+	}
+	p->next = head;
+	head->prior = p;
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	LinkList plist = list->next;
+	while (plist->next != list->next) {
+		printf("%d ", plist->data);
+		plist = plist->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+#pragma endregion
+
+
+//P42.17
+
+bool Palindrome(LinkList& A) {
+	LinkList P = A->next;
+	LinkList Q = A->prior;
+	for (; P->data == Q->data && (P->prior != Q && P != Q ); P = P->next, Q = Q->prior);
+	if (P->prior == Q || P == Q)
+		return true;
+	return false;
+
+}
+
+int main()
+{
+	cout << "输入数据:" << endl;
+	vector<int> data1{ 1,3,7,7,3,1 }; // 偶数
+	/*vector<int> data1{ 1,3,7,9,7,3,1 };*/  //奇数 
+	LinkList A;
+	InitList(A);
+	A = CreatList(data1);
+	PrintList(A);
+	cout << "测试结果:" << endl;
+	if (Palindrome(A)) {
+		cout << "序列A对称" << endl;
+	}
+	else {
+		cout << "序列A不对称" << endl;
+	}
+	return 0;
+}
diff --git a/线性表/链式实现大题/P42.18.cpp b/线性表/链式实现大题/P42.18.cpp
new file mode 100644
index 0000000..5586be9
--- /dev/null
+++ b/线性表/链式实现大题/P42.18.cpp
@@ -0,0 +1,118 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P42.18
+//有两个循环单链表, 链表头指针分别为h1和h2, 编写一个函数将链表h2链接到链表
+//h1之后, 要求链接后的链表仍保持循环链表形式
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的循环单链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = L;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == L);
+}
+
+//判断结点P是否为表尾结点
+bool IsTail(LinkList L, LNode* p) {
+	return (p->next == L);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	p->next = head;
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	LinkList plist = list->next;
+	while (plist->next != list->next) {
+		printf("%d ", plist->data);
+		plist = plist->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+#pragma endregion
+
+
+//P42.18
+LinkList Merger(LinkList &A,LinkList &B) {
+
+	LinkList pa = A->next;
+	LinkList pb = B->next;
+	for (; pa->next != A; pa = pa->next);
+	for (; pb->next != B; pb = pb->next);
+	pa->next = B->next;
+	pb->next = A;
+	return A;
+}
+
+
+int main()
+{
+	cout << "输入数据:" << endl;
+	vector<int> data1{ 1,3,5,9,7,1 };
+	vector<int> data2{ 2,4,6,8,4,2 };
+	LinkList A;
+	InitList(A);
+	A = CreatList(data1);
+	PrintList(A);
+	LinkList B;
+	InitList(B);
+	B = CreatList(data2);
+	PrintList(B);
+	cout << "测试结果:" << endl;
+	A = Merger(A, B);
+	PrintList(A);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P42.19.cpp b/线性表/链式实现大题/P42.19.cpp
new file mode 100644
index 0000000..923773e
--- /dev/null
+++ b/线性表/链式实现大题/P42.19.cpp
@@ -0,0 +1,133 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P42.19
+//设有一个带头结点的循环单链表，其结点值均为正整数。设计一个算法，反复找出单链
+//表中结点值最小的结点并输出，然后将该结点从中删除, 直到单链表空为止，再删除表
+//头结点。
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的循环单链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = L;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == L);
+}
+
+//判断结点P是否为表尾结点
+bool IsTail(LinkList L, LNode* p) {
+	return (p->next == L);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	p->next = head;
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	LinkList plist = list->next;
+	while (plist->next != list->next) {
+		printf("%d ", plist->data);
+		plist = plist->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+#pragma endregion
+
+
+//P42.19
+void DelMinPrint(LinkList& A) {
+	LinkList p = A->next;
+	LinkList pre = A;
+	LNode* minp = p;
+	LNode* minpre = A;
+	while (A->next != A)
+	{
+		p = A->next;
+		pre = A;
+		minp = p;
+		minpre = pre;
+		while (p != A) {
+			
+			if (p->data < minp->data) {
+				minp = p;
+				minpre = pre;
+			}
+			else {
+				pre = p;
+				p = p->next;
+			}
+		}
+		minpre->next = minp->next;
+		cout << minp->data<<" ";
+		delete minp;
+	}
+	cout << endl;
+	
+}
+
+
+int main()
+{
+	cout << "输入数据:" << endl;
+	vector<int> data1{ 1,3,5,9,7,2 };
+	LinkList A;
+	InitList(A);
+	A = CreatList(data1);
+	PrintList(A);
+	cout << "测试结果:" << endl;
+	DelMinPrint(A);
+	PrintList(A);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P42.20.cpp b/线性表/链式实现大题/P42.20.cpp
new file mode 100644
index 0000000..852ee70
--- /dev/null
+++ b/线性表/链式实现大题/P42.20.cpp
@@ -0,0 +1,129 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P42.20
+//设头指针为L的带有表头结点的非循环双向链表, 其每个结点中除有pred(前驱
+//指针)、data(数据)和next(后继指针)域外, 还有一个访问频度域freq。在
+//链表被启用前, 其值均初始化为零。每当在链表中进行一次 Locate(L, x)运算时
+//令元素值为ⅹ的结点中freq域的值增1, 并使此链表中结点保持按访问频度非增
+//(递减)的顺序排列, 同时最近访问的结点排在频度相同的结点前面, 以便使频繁
+//访问的结点总是靠近表头。试编写符合上述要求的 Locate(L, x)运算的算法, 该
+//运算为函数过程, 返回找到结点的地址, 类型为指针型
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的双链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next, * prior;
+	int freq = 0;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	L->prior = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		s->prior = p;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	LinkList plist = list->next;
+	while (plist != NULL) {
+		printf("%d ", plist->data);
+		plist = plist->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+#pragma endregion
+
+
+//P42.20
+LNode* Locate(LinkList L, int x) {
+	LinkList p = L->next, pre = L;
+	for (; p && p->data != x; p = p->next);
+	if (!p) {
+		cout << "x is not exist!" << endl;
+		return NULL;
+	}
+	else {
+		(p->freq)++;
+		p->prior->next = p->next;
+		p->next->prior = p->prior;
+		pre = p->prior;
+		for (; pre != L && pre->freq <= p->freq; pre = pre->prior);
+		p->next = pre->next;
+		pre->next->prior = p;
+		p->prior = pre;
+		pre->next = p;
+	}
+	return p;
+}
+
+int main()
+{
+	cout << "输入数据:" << endl;
+	vector<int> data1{ 1,3,4,7,2,1 }; 
+	LinkList A;
+	InitList(A);
+	A = CreatList(data1);
+	PrintList(A);
+	cout << "测试结果:" << endl;
+	Locate(A, 3);
+	Locate(A, 99);
+	Locate(A, 4);
+	Locate(A, 4);
+	Locate(A, 2);
+	Locate(A, 7);
+	PrintList(A);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P42.21.cpp b/线性表/链式实现大题/P42.21.cpp
new file mode 100644
index 0000000..360543b
--- /dev/null
+++ b/线性表/链式实现大题/P42.21.cpp
@@ -0,0 +1,140 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P42.21
+//已知一个带有表头结点的单链表，结点结构为
+//			data	link
+//假设该链表只给出了头指针1ist。在不改变链表的前提下, 请设计一个尽可能高效的
+//算法, 查找链表中倒数第k个位置上的结点(k为正整数)。若查找成功, 算法输出该结
+//点的data域的值, 并返回1; 否则, 只返回0。
+//1)描述算法的基本设计思想
+//2)描述算法的详细实现步骤
+//3)根据设计思想和实现步骤, 采用程序设计语言描述算法(使用C、C++或Java语
+//实现), 关键之处请给出简要注释
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->data = NULL;
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	list = list->next;
+	while (list != NULL) {
+		printf("%d ", list->data);
+		list = list->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+
+#pragma endregion
+
+
+//P42.21
+//自己版本
+int PenultiMateK(LinkList L, int k) {
+	int len = Getlen(L);
+	int pin = len - k ;
+	int count = 1;
+	LinkList p = L->next;
+	for (; p && count != pin; p = p->next, count++);
+	if (p) {
+		cout << p->data;
+		return 1;
+	}
+	else {
+		cout << "The element in the penultimate k position does not exist" << endl;
+		return 0;
+	}	
+}
+
+//书上版本
+int Search_K(LinkList L, int k) {
+	int count = 0;
+	LinkList p = L->next, pk = p;
+	while (p) {
+		if (count < k)
+			count++;
+		else
+			pk = pk->next;
+		p = p->next;
+	}
+	if (count < k) {
+		cout << "The element in the penultimate k position does not exist" << endl;
+		return 0;
+	}
+	else {
+		cout << pk->data;
+		return 1;
+	}
+}
+
+int main()
+{
+	vector<int> data{ 1,3,5,7,9,11,13,15 };
+	LinkList head;
+	InitList(head);
+	head = CreatList(data);
+	PrintList(head);
+	//PenultiMateK(head, 3);
+	Search_K(head, 8);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P43.22.cpp b/线性表/链式实现大题/P43.22.cpp
new file mode 100644
index 0000000..80ad67a
--- /dev/null
+++ b/线性表/链式实现大题/P43.22.cpp
@@ -0,0 +1,131 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P43.22
+//假定采用带头结点的单链表保存单词，当两个单词有相同的后缀时,
+//可共享相同的后缀存储空间，例如，“loading”和 “being”的存储映像如下图所示。
+//设str1和str2分别指向两个单词所在单链表的头结点, 链表结点结构为data,next,
+//请设计一个时间上尽可能高效的算法, 找出由Str1和str2所指向两个链表共同后缀
+//的起始位置(如图中字符i所在结点的位置p)。要求
+//1)给出算法的基本设计思想
+//2)根据设计思想, 采用C或C++或Java语言描述算法, 关键之处给出注释
+//3)说明你所设计算法的时间复杂度
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->data = NULL;
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	while (list != NULL) {
+		printf("%d ", list->data);
+		list = list->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+
+#pragma endregion
+
+
+//P42.22
+LinkList FindCom(LinkList A,LinkList B) {
+	int len1 = Getlen(A), len2 = Getlen(B), Diff = abs(len1 - len2);
+	LinkList longlist, shortlist;
+	if (len1 > len2) {
+		longlist = A->next;
+		shortlist = B->next;
+	}
+	else {
+		longlist = B->next;
+		shortlist = A->next;
+	}
+	while (Diff--)
+		longlist = longlist->next;
+	while (longlist) {
+		if (longlist == shortlist)
+			return longlist;
+		longlist = longlist->next;
+		shortlist = shortlist->next;
+	}
+}
+
+int main()
+{
+	vector<int> data1{ 3,5,6,8,1,4,9,77 };
+	vector<int> data2{ 2,5,7,88,31 };
+	LinkList head1;
+	LinkList head2;
+	InitList(head1);
+	InitList(head2);
+	head1 = CreatList(data1);
+	head2 = CreatList(data2);
+	LinkList com = head1->next;
+	LinkList P = head2->next;
+	for (; com != NULL && com->data != 8; com = com->next);
+	for (; P->next != NULL; P = P->next);
+	P->next = com;
+	PrintList(head1->next);
+	PrintList(head2->next);
+	LinkList C = FindCom(head1, head2);
+	PrintList(C);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P43.23.cpp b/线性表/链式实现大题/P43.23.cpp
new file mode 100644
index 0000000..4033909
--- /dev/null
+++ b/线性表/链式实现大题/P43.23.cpp
@@ -0,0 +1,121 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P43.23
+//用单链表保存m个整数, 结点的结构为[data][1ink], 且 |data| ≤ n
+//(n为正整数)。现要求设计一个时间复杂度尽可能高效的算法, 对于链表中data的绝对值
+//相等的结点, 仅保留第一次出现的结点而删除其余绝对值相等的结点。
+//要求
+//1)给出算法的基本设计思想
+//2)使用C或C + 语言, 给出单链表结点的数据类型定义
+//3)根据设计思想, 采用C或C + 语言描述算法, 关键之处给出注释
+//4)说明你所设计算法的时间复杂度和空间复杂度
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+#define N 30
+
+#pragma region 建立带头结点的链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->data = NULL;
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	list = list->next;
+	while (list != NULL) {
+		printf("%d ", list->data);
+		list = list->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+
+#pragma endregion
+
+
+//P43.23
+void de_duplication(LinkList L) {
+	vector<int> box(N + 1, 0);
+	LinkList p = L->next, pre = L;
+	while(p) {
+		if (!box[abs(p->data)]) {
+			box[abs(p->data)] = 1;
+			pre = p;
+			p = p->next;
+		}
+		else {
+			LNode* r = p->next;
+			pre->next = p->next;
+			delete p;
+			p = r;
+		}
+	}
+	box.clear();
+}
+
+int main()
+{
+	vector<int> data{ 21,-11,-15,-7,15,11,13,15 };
+	LinkList head;
+	InitList(head);
+	head = CreatList(data);
+	PrintList(head);
+	de_duplication(head);
+	PrintList(head);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P44.24.cpp b/线性表/链式实现大题/P44.24.cpp
new file mode 100644
index 0000000..46b0d1d
--- /dev/null
+++ b/线性表/链式实现大题/P44.24.cpp
@@ -0,0 +1,113 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P44,24
+//设计一个算法完成以下功能:判断一个链表是否有环, 如果有, 找出环的入口点并返回,
+//否则返回NULL
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->data = NULL;
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	//list = list->next;
+	while (list != NULL) {
+		printf("%d ", list->data);
+		list = list->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+
+#pragma endregion
+
+
+//P43.24
+LNode* FindCycle(LinkList L) {
+	LinkList fast = L, slow = L;
+	while (slow != NULL && fast->next != NULL) {
+		slow = slow->next;
+		fast = fast->next->next;
+		if (slow == fast)
+			break;
+	}
+	if (slow == NULL || (fast->next == NULL))
+		return NULL;
+	LinkList p = L, q = slow;
+	for (; p != q; p = p->next, q = q->next);
+	return q;
+ }
+int main()
+{
+	vector<int> data{ 1,3,5,7,9,11,13,15 };
+	LinkList head;
+	InitList(head);
+	head = CreatList(data);
+	LinkList p = head->next, q = p;
+	for (; p->next; p = p->next);
+	for (; q->next && q->data != 9; q = q->next);
+	p->next = q;
+	//PrintList(head->next);
+	LinkList cycle = FindCycle(head);
+	PrintList(cycle);
+	return 0;
+}
diff --git a/线性表/链式实现大题/P44.25.cpp b/线性表/链式实现大题/P44.25.cpp
new file mode 100644
index 0000000..511857f
--- /dev/null
+++ b/线性表/链式实现大题/P44.25.cpp
@@ -0,0 +1,132 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//P44.25
+//设线性表L = (a1,a2, a3,…, an-2,an-1,an)采用带头结点的单链表保存
+//请设计一个空间复杂度为O(1)且时间上尽可能高效的算法, 重新排列 L中的各结点, 得
+//到线性表L = (a1, an,a2,an-1, a3, an-2…)。要求
+//1)给出算法的基本设计思想
+//2)根据设计思想, 采用C或C艹语言描述算法, 关键之处给出注释
+//3)说明你所设计的算法的时间复杂度
+
+#define ElemType int
+#define _for(i,a,b) for(int i=(a);i<(b);i++)
+#define INF 0x3f3f3f3f
+
+#pragma region 建立带头结点的链表
+
+typedef struct LNode {
+	ElemType data;
+	struct LNode* next;
+}LNode, * LinkList;
+
+//初始化链表
+bool InitList(LinkList& L) {
+	//分配一个头结点
+	L = (LNode*)malloc(sizeof(LNode));
+	//内存不足，分配失败
+	if (L == NULL) {
+		return false;
+	}
+	//头结点之后暂时还没有节点
+	L->next = NULL;
+	return true;
+}
+
+
+//判断是否为空
+bool IsEmpty(LinkList L) {
+	return ((L->next) == NULL);
+}
+
+//使用尾插法建表
+LinkList CreatList(vector<int> data) {
+	if (data.size() < 1) {
+		return NULL;
+	}
+	//头结点
+	LNode* head = (LinkList)malloc(sizeof(LNode));
+	head->data = NULL;
+	head->next = NULL;
+	LinkList p = head;
+	_for(i, 0, data.size()) {
+		LNode* s = (LinkList)malloc(sizeof(LNode));
+		s->data = data[i];
+		s->next = NULL;
+		p->next = s;
+		p = s;
+	}
+	return head;
+}
+//输出链表
+void PrintList(LinkList list) {
+	if (IsEmpty(list)) {
+		cout << "the list is null" << endl;
+		return;
+	}
+	list = list->next;
+	while (list != NULL) {
+		printf("%d ", list->data);
+		list = list->next;
+	}
+	printf("\n");
+}
+
+int Getlen(LinkList L) {
+	int len = 0;
+	while (L != NULL) {
+		L = L->next;
+		len++;
+	}
+	return len;
+}
+
+#pragma endregion
+
+
+//P44.25
+
+
+void Custom_sort(LinkList& L) {
+	LinkList p, q, r, s;
+	p = q = L;
+	while (q->next != NULL) {
+		p = p->next;
+		q = q->next;
+		if (q->next != NULL) {
+			q = q->next;
+		}
+	}
+	q = p->next;
+	p->next = NULL;
+	while (q != NULL) {
+		r = q->next;
+		q->next = p->next;
+		p->next = q;
+		q = r;
+	}
+	s = L->next;
+	q = p->next;
+	p->next = NULL;
+	while (q != NULL) {
+		r = q->next;
+		q->next = s->next;
+		s->next = q;
+		s = q->next;
+		q = r;
+	}
+
+}
+
+int main()
+{
+	vector<int> data{ 1,3,5,7,15,13,11,9 };
+	LinkList head;
+	InitList(head);
+	head = CreatList(data);
+	PrintList(head);
+	Custom_sort(head);
+	PrintList(head);
+	return 0;
+}