Merge pull request wangzheng0822#4 from MrzhangF1ghter/MrzhangF1ghter

回文算法 C++实现

Author: wangzheng0822

c-cpp/06_linkedlist/list_isPalindrome/LinkList.cpp

@@ -0,0 +1,148 @@
+#include "LinkList.h"
+
+void CreateListHead(LinkList *&L,ElemType a[],int n)
+{
+	int i;
+	LinkList *s;
+	L = (LinkList *)malloc(sizeof(LinkList));
+	L->next = NULL;
+	for(i = 0;i < n;i++)
+	{
+		s=(LinkList*)malloc(sizeof(LinkList));
+		s->data = a[i];
+		s->next = L->next;
+		L->next = s;
+	}
+}
+void CreateListTail(LinkList *&L,ElemType a[],int n)
+{
+	int i;
+	LinkList * s,* r;
+	L = (LinkList *)malloc(sizeof(LinkList));
+	r = L;
+	for(i = 0;i < n;i++)
+	{
+		s = (LinkList *)malloc(sizeof(LinkList));
+		s->data = a[i];
+		r->next = s;
+		r = s;
+	}
+	r->next = NULL; 
+}
+void InitList(LinkList *&L)
+{
+	L=(LinkList *)malloc(sizeof(LinkList));
+	L->next = NULL;
+}
+void DestroyList(LinkList *&L)
+{
+	LinkList * pre = L,*p = L->next;
+	while(p!=NULL)
+	{
+		free(pre);
+		pre = p;
+		p = L->next;
+	}
+	free(pre);
+}
+bool ListEmpty(LinkList *L)
+{
+	return(L->next==NULL); 
+}
+int ListLength(LinkList *L)
+{
+	int n = 0;
+	LinkList * p = L;
+	while(p->next!=NULL)
+	{
+		n++;
+		p=p->next;
+	}
+	return(n);
+}
+void ShowList(LinkList *L)
+{
+	LinkList * p = L->next;//Ö¸Ïò¿ªÊ¼½Úµã
+	while(p!=NULL)
+	{
+		printf(" %c ",p->data);
+		p = p->next; 
+	} 
+	printf("\n");
+}
+bool GetListElem(LinkList *L,int i,ElemType &e)
+{
+	int j = 0;
+	LinkList *p = L;
+	while(j<i&&p!=NULL)
+	{
+		j++;
+		p=p->next;
+	}
+	if(p==NULL)
+		return false;
+	else
+	{
+		e=p->data;
+		return true;
+	}
+}
+int LocateElem(LinkList*L,ElemType e)
+{
+	int i=1;
+	LinkList *p = L->next;
+	while(p!=NULL&&p->data!=e){
+		p=p->next;
+		i++;
+	}
+	if(p==NULL)
+	{
+		return(0);
+	}
+	else
+		return(i);
+}
+bool ListInsert(LinkList *&L,int i,ElemType e)
+{
+	int j=0;
+	LinkList *p =L,*s;
+	while(j<i-1&&p!=NULL)
+	{
+		j++;
+		p=p->next;
+	}
+	if(p==NULL)
+	{
+		return false;
+	}
+	else
+	{
+		s= (LinkList*)malloc(sizeof(LinkList));
+		s->data = e;
+		s->next = p->next;
+		p->next = s;
+		return true;
+	}
+}
+bool ListDelete(LinkList *&L,int i,ElemType &e)
+{
+	int j=0;
+	LinkList * p =L,*q;
+	while(j<i-1&&p!=NULL)
+	{
+		j++;
+		p=p->next;
+	}
+	if(p==NULL)
+		return false;
+	else
+	{
+		q=p->next;
+		if(q==NULL)
+			return false;
+		e=q->data;
+		p->next=q->next;
+		free(q);
+		return true;
+	}
+}

c-cpp/06_linkedlist/list_isPalindrome/LinkList.h

@@ -0,0 +1,24 @@
+#ifndef LINKLIST_H
+#define LINKLIST_H
+
+#include <stdlib.h>
+#include <stdio.h>
+typedef char ElemType;
+typedef struct LNode 
+{
+	ElemType data;
+	struct LNode*next;
+}LinkList;
+
+void CreateListHead(LinkList *&L,ElemType a[],int n);
+void CreateListTail(LinkList *&L,ElemType a[],int n);
+void InitList(LinkList *&L);
+void DestroyList(LinkList *&L);
+bool ListEmpty(LinkList *L);
+int ListLength(LinkList *L);
+void ShowList(LinkList *L);
+bool GetListElem(LinkList *L,int i,ElemType &e);
+int LocateElem(LinkList*L,ElemType e);
+bool ListInsert(LinkList *&L,int i,ElemType e);
+bool ListDelete(LinkList *&L,int i,ElemType &e);
+#endif

c-cpp/06_linkedlist/list_isPalindrome/main.cpp

@@ -0,0 +1,40 @@
+#include"LinkList.h"
+char array1[]= {'a','b','c','b','a'};
+bool isPalindrome(LinkList * list,int length);
+int main()
+{
+	LinkList * list;
+
+	int length = sizeof(array1)/sizeof(array1[0]);
+	InitList(list);
+	CreateListTail(list,array1,length);//用尾插法创建一个单链表
+	if(isPalindrome(list,length))
+		printf("isPalindrome\n");
+	else
+		printf("isNotPalindrome\n");
+	return 0;
+}
+bool isPalindrome(LinkList * list,int length)
+{
+	int i;
+	char buff1[length],buff2[length];
+	ElemType e;
+	for(i=1; i<=length; i++) 
+	{
+		GetListElem(list,i,e);//遍历获取链表元素并放入数组中 
+		buff1[i-1]=e;//正向数组 
+		buff2[length-i]=e;//反向数组 
+	}
+	i=0;
+	while(i<=length) {
+		if(buff1[i]==buff2[i])//比较 
+		{
+			i++; 
+		} 
+		else 
+		{
+			return false;
+		}
+	}
+	return true;
+}