筆試程序題專項----鏈表關於中心對稱

 

#include <stdio.h>
#include<stdlib.h>
#include<iostream>
#include<stack>
using namespace std;
#define SUCCESS 1000001
#define FAILURE 1000002
#define TRUE    1000003
#define FALSE   1000004
typedef int ElemType;
 
struct node
{
    ElemType data;
    struct node *next;
};
 
typedef struct node Node;
typedef Node *LinkList;

 
int ListInit(LinkList *L);
int ListInsert(LinkList *L,int i,ElemType e);
int ListTraverse(LinkList L,ElemType(*print)(ElemType));
ElemType visit(ElemType e);
bool isSame(LinkList L, int len)
{
	LinkList p=L->next;
	stack<ElemType> st;
	int n=len/2;
	for(int i=0;i<n;i++)
	{
		st.push(p->data);
		p=p->next;
	}
	if(len%2==1) p=p->next;
	for(int i=0;i<n;i++)
	{
		if(p->data==st.top())
		{
			st.pop();
			p=p->next;
		}
		else 
		return false;
	}
	return true;
}

bool isSame2(LinkList L, int len)
{
	LinkList p=L->next,p1,p2,pt;
	int n=len/2;
	if(len==1) 
	return true;
	p1=p;
	for(int i=0;i<n;i++)
	{
		p=p->next;
	}
	
	if(len%2==1) p=p->next;
	p2=p->next;
	if(p2!=NULL)
	{
		p->next=NULL;
		for(int i=0;i<n-1;i++)
		{
			pt=p2->next;
			p2->next=p;
			p=p2;
			p2=pt;	
		}
	}
	p2=p; 

	for(int i=0;i<n;i++)
	{
		if(p1->data==p2->data)
		{
			p1=p1->next;
			p2=p2->next;
		}
		else 
		return false;
	}
	return true;
}
int main()
{
    int ret,i;
    LinkList list;
    int place;
    ElemType e;
    ret = ListInit(&list);
    for(i = 0; i < 5; i++)
    {
        ret = ListInsert(&list,i+1,i); 
    }
    for(i = 0; i < 5; i++)
    {
        ret = ListInsert(&list,i+6,5-i-1); 
    }
    ret = ListTraverse(list,visit);
    cout<<endl;
    cout<<endl<<isSame(list,10)<<endl;
	cout<<endl<<isSame2(list,10)<<endl;
    return 0;
}
 
int ListInit(LinkList *L)
{
    (*L) = (LinkList)malloc(sizeof(Node));
    if(NULL == (*L))
    {
        return FAILURE;
    }
    (*L)->next = NULL;
 
    return SUCCESS;
}
 
int ListInsert(LinkList *L,int i,ElemType e)
{
    LinkList p = *L;
    int j = 1;
    while( p != NULL && j < i)
    {
        p = p->next;
        j++;
    }
    if( p == NULL || j > i)
    {
        return FAILURE;
    }
    LinkList n = (LinkList)malloc(sizeof(Node));
    if(NULL == n)
    {
        return FAILURE;
    }
    n->data = e;
    n->next = p->next;
    p->next = n;
    return SUCCESS;
}

ElemType visit(ElemType e)
{
    printf("%d ",e);
    return e;
} 

int ListTraverse(LinkList L,ElemType(*print)(ElemType))
{
    if(NULL == L)
    {
        return FAILURE;
    }
    LinkList p = L->next;
    while(p)
    {
        p->data=print(p->data);
        p = p->next;
    }
    return SUCCESS;
}