本文主要是介绍设以带头结点的双向循环链表表示的线性表L= (a1,a2,…,an),试写一时间复杂度O(n)的算法,将L改造为 (a1,a3,…,an,…,a4,a2)。,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
#include<stdio.h>
typedef int ElemType;
typedef struct DuLNode{ElemType data;struct DuLNode *prior;struct DuLNode *next;
} DuLNode, *DuLinkList;DuLinkList InitDuLinkList();//初始化双向循环链表(头节点)
void CreateDuLinkList(DuLinkList L, ElemType *arr, int n);//创建链表元素
void ShowList(DuLinkList L);//输出链表/*
将L中的元素,按如下规则插入新表,并返回新表。
(1,2)->(1,3,2)->(1,3,4,2)->(1,3,5,4,2)->(1,3,5,6,4,2)->...
*/
DuLinkList Transform(DuLinkList L);int main()
{ElemType data[7] = { 1, 2, 3, 4, 5, 6, 7 };//测试数据1(奇数个)//ElemType data[8] = { 1, 2, 3, 4, 5, 6, 7, 8 };//测试数据2(偶数个)int length = sizeof(data) / sizeof(ElemType);DuLinkList L = InitDuLinkList(), Lnew;CreateDuLinkList(L, data, length);printf("原链表:");ShowList(L);Lnew = Transform(L);printf("改造表:");ShowList(Lnew);getchar();return 0;
}DuLinkList InitDuLinkList()
{DuLNode *dnode = (DuLNode *)malloc(sizeof(DuLNode));dnode->data = 0;dnode->prior = dnode;dnode->next = dnode;return dnode;
}void CreateDuLinkList(DuLinkList L, ElemType *arr, int n)
{DuLNode *dnode;DuLNode *p = L;int i;for (i = 0; i < n; i++){dnode = (DuLNode *)malloc(sizeof(DuLNode));dnode->data = arr[i];dnode->next = L;dnode->prior = p;p->next = dnode;p = p->next;}
}void ShowList(DuLinkList L)
{int i;DuLNode *r = L->next;while (r->next != L){printf("%d ", r->data);r = r->next;}printf("%d ", r->data);printf("\n");
}DuLinkList Transform(DuLinkList L)
{DuLinkList Lnew = InitDuLinkList();DuLNode *p, *q, *pa, *pb;q = p = L->next;pa = pb = Lnew;while (p != L){if (p != L){/*L中寄数个数据插入Lnew*/q = p->next;//保留 L 链表//pa之后插入pp->prior = pa;pa->next = p;p->next = pb;pb->prior = p;pa = pa->next;p = q;//p指向 待操作 L}if (p != L){/*L中偶数个数据插入Lnew*/q = p->next;//保留 L 链表//pb之前插入pp->next = pb;pb->prior = p;p->prior = pa;pa->next = p;pb = pb->prior;p = q;//p指向 待操作 L}}return Lnew;
}
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