多項式求和（用鏈表）

<pre name="code" class="cpp">#include"stdio.h"
struct poly{
	int exp;
	int coef;
	struct poly *next;
};
//創建多項式
struct poly *createPolyLink(int p[][2],int num)
{
	struct poly *head;
	struct poly *newNode;
	struct poly *temp;
	int i;
	head=(struct poly *)malloc(sizeof(struct poly));
	if(num<=0)
		return NULL;
	head->next =NULL;
	for(i=0;i<num;i++)
	{
		newNode=(struct poly *)malloc(sizeof(struct poly));
		newNode->coef =p[i][1];
		newNode->exp =p[i][0];
		newNode->next =NULL;
		if(head->next ==NULL)
		{
			head->next =newNode;
			temp=newNode;
		}		
		else
		{
			temp->next =newNode;
			temp=newNode;
		}
		
	}
	return head;
}
//輸出多項式
void printPoly(struct poly *p)
{
	struct poly *temp;
	if(p->next ==NULL)
		return ;
	temp=p->next ;
	while(temp)
	{
		printf("coef: %d,exp: %d\n",temp->coef ,temp->exp );
		temp=temp->next ;
	}
	
}
//對鏈表進行排序
struct poly *polySort(struct poly *p)
{
	struct poly *startNode,*endNode,*pra,*temp1,*temp2;  
    int temp; 
	int tem;
    startNode=p->next ;  
    endNode=pra=startNode;  
  
    if(startNode->next ==NULL)  
        return p;  
    //找到鏈表的表尾  
    while(endNode->next )  
    {  
        pra=endNode;  
        endNode=endNode->next ;    
    }  
    while(pra!=startNode)  
    {  
        temp1=startNode;  
        temp2=startNode->next ;  
        while(1)  
        {  
            if(temp1->exp>temp2->exp )  
            {  
                temp=temp1->exp ; 
				tem=temp1->coef ;

                temp1->exp =temp2->exp ; 
				temp1->coef =temp2->coef ;
				
                temp2->exp =temp; 
				temp2->coef =tem;
            }  
            if(temp2==endNode)  
                break;  
            temp1=temp2;  
            temp2=temp2->next ;  
              
        }  
        endNode=startNode;  
        while(endNode->next!=pra )  
            endNode=endNode->next ;    
        pra=endNode;  
        endNode=endNode->next ;  
    }  
    return p;  
	
}
//合併兩個鏈表  
struct poly *conLink(struct poly *a,struct  poly *b)  
{  
    struct poly *link1,*link2,*temp1,*temp2;  
	struct poly *temp,*pra;
    link1=a->next ;  
    link2=b->next ;  
    temp2=link2->next ;  
    while(link1->next !=NULL&&link2!=NULL)  
    {  
        temp1=link1->next ;  
        if(temp1->exp>link2->exp )  
        {  
            link2->next=link1->next ;  
            link1->next =link2;  
            link2=temp2;  
            temp2=temp2->next ;  
            link1=link1->next ;  
        }else if(temp1->exp==link2->exp )
		{
			temp1->coef=temp1->coef +link2->coef ;
			if(temp1->coef ==0)
			{
				link1->next =temp1->next;
				link2=temp2;
				if(link2 == NULL)
					break;
			    temp2=temp2->next ;
				continue;
			}
			link1=temp1;
			link2=temp2 ;
			if(link2 == NULL)
				break;
			temp2=temp2->next ;
		}else  
        {  
            link1=temp1;  
        }  
    }  
    if(link2!=NULL)  
    {  
       while(link2)  
       {  
           link1->next =link2;  
           link1=link2;  
           link2=link2->next ;  
       }  
    }  
    return a;  
      
}  
  
struct  poly *comLink(struct poly *a,struct poly *b)  
{  
    struct  poly *link1,*link2;  
    link1=a->next ;  
    link2=b->next ;  
    if(link1->exp <link2->exp)  
         return conLink(a,b);  
    else  
        return conLink(b,a);  
}  
void main()
{
	struct poly *A;
	struct poly *B;
	struct poly *addPoly;
	int a[3][2]={
		{5,2},
		{2,3},
		{3,4}
	};
		int b[3][2]={
		{3,-4},
		{4,3},
		{5,4}
	};
	
	printf("多項式求和：\n");
	A=createPolyLink(a,3);
	//輸出創建的多項式鏈表
	printf("輸出創建的多項式鏈表\n");
	printPoly(A);

	B=createPolyLink(b,3);
	//輸出創建的多項式鏈表
	printf("輸出創建的多項式鏈表\n");
	printPoly(B);

	//對鏈表進行排序
	A=polySort(A);
	printf("排序後的鏈表A\n");
	printPoly(A);

	B=polySort(B);
	printf("排序後的鏈表B\n");
	printPoly(B);

	//合併多項式
	printf("合併後的鏈表\n");
	addPoly=comLink(A,B);
	printPoly(addPoly);
	
	getchar();
}