十字链表cross.cpp

数据结构经典课件(附带各章的经典算法) 具体代码是使用C语言编写的

#include <stdio.h>
#include <malloc.h>
#define M 3         			
#define N 3            			
#define Max ((M)>(N)?(M):(N))   
typedef int ElemType;
typedef struct mtxn 
{ 
	int row;					
	int col;					
   	struct mtxn *right,*down;	
	union 
	{
		ElemType value;
		struct mtxn *link;
	} tag;
} MatNode;			
void CreatMat(MatNode *&mh,ElemType a[][N])
{
	int i,j;
	MatNode *h[Max],*p,*q,*r;
	mh=(MatNode *)malloc(sizeof(MatNode));
	mh->row=M;mh->col=N;
	r=mh;					
	for (i=0;i<Max;i++)	
	{
		h[i]=(MatNode *)malloc(sizeof(MatNode));
		h[i]->down=h[i]->right=h[i];		
		h[i]->row=h[i]->col=0;				
		r->tag.link=h[i];				
		r=h[i];
	}
	r->tag.link=mh;						
	for (i=0;i<M;i++)					
	{
		for (j=0;j<N;j++)				
		{
			if (a[i][j]!=0)				
			{
				p=(MatNode *)malloc(sizeof(MatNode));	
				p->row=i+1;p->col=j+1;p->tag.value=a[i][j];
				q=h[i];      					
                while (q->right!=h[i] && q->right->col<j+1) 
                  	q=q->right;
				p->right=q->right;q->right=p;	
				q=h[j];      					
				while (q->down!=h[j] && q->down->row<i+1) 
					q=q->down;
				p->down=q->down;q->down=p;  
			}
		}
	}
}
void DispMat(MatNode *mh)
{
	MatNode *p,*q;
	printf("行=%d  列=%d\n", mh->row,mh->col);
	p=mh->tag.link;
	while (p!=mh) 
	{	
		q=p->right;
		while (p!=q) 		
		{
			printf("%d\t%d\t%d\n", q->row,q->col,q->tag.value);
			q=q->right;
		}
		p=p->tag.link;
	}
}

bool access(MatNode *mh,int i,int j,ElemType &e)
{
	if(i<0 || i>=mh->row || j<0 || j>=mh->col)
		return false;
	MatNode *p,*hi;
	int k=1;
	hi=mh->tag.link;
	while(k<i)
	{hi=hi->tag.link ;
	 k++;
	}
	p=hi->right;
	while(p!=hi && p->col<j)
		p=p->right;
	if(p->col==j)
		e=p->tag.value ;
	else
		e=0;
	return true;

}
void main()
{
	ElemType a[M][N]={{1,0,3},{0,2,0},{0,0,5}},e;
	ElemType b[M][N]={{-1,0,2},{0,-2,0},{1,0,-5}};
//    ElemType c[][5]={{0,5,0,0,8},{1,0,3,0,0},{0,-2,0,0,0},{6,0,0,0,0},{0,4,-9,0,0}};
	MatNode *mx,*my;
	CreatMat(mx,a);
    bool k=access(mx,2,2,e);
	CreatMat(my,b);
	printf("a的三元组:\n");DispMat(mx);
	printf("b的三元组:\n");DispMat(my);
}