本题要求实现两个函数,分别将读入的数据存储为单链表、将链表中奇数值的结点重新组成一个新的链表。链表结点定义如下:
struct ListNode {
int data;
ListNode *next;
};
函数接口定义:
struct ListNode *readlist();
struct ListNode *getodd( struct ListNode **L );
函数readlist从标准输入读入一系列正整数,按照读入顺序建立单链表。当读到−1时表示输入结束,函数应返回指向单链表头结点的指针。
函数getodd将单链表L中奇数值的结点分离出来,重新组成一个新的链表。返回指向新链表头结点的指针,同时将L中存储的地址改为删除了奇数值结点后的链表的头结点地址(所以要传入L的指针)。
裁判测试程序样例:
#include <stdio.h>
#include <stdlib.h>
struct ListNode {
int data;
struct ListNode *next;
};
struct ListNode *readlist();
struct ListNode *getodd( struct ListNode **L );
void printlist( struct ListNode *L )
{
struct ListNode *p = L;
while (p) {
printf("%d ", p->data);
p = p->next;
}
printf("\n");
}
int main()
{
struct ListNode *L, *Odd;
L = readlist();
Odd = getodd(&L);
printlist(Odd);
printlist(L);
return 0;
}
/* 你的代码将被嵌在这里 */
输入样例:
1 2 2 3 4 5 6 7 -1
输出样例:
1 3 5 7
2 2 4 6
struct ListNode* readlist()
{
int number = 0;
struct ListNode* current=0;
struct ListNode* tail=0;
struct ListNode* head = 0;
do {
scanf("%d", &number);
if (number != -1) {
current = (struct ListNode*)malloc(sizeof(head));
current->data = number;
current->next = NULL;
if (head == 0)
{
head = current;
}
else {
tail->next = current;
}
tail = current;
current = current->next;
}
} while (number != -1);
return head;
}
struct ListNode* getodd(struct ListNode** L)
{
struct ListNode *odd_head = NULL;
struct ListNode* current = *L;
struct ListNode* tail = *L,*pre=*L;
int number;
while(current)
{
number = current->data;
if (number % 2 != 0) {
if (current == *L) {
*L = current->next;
pre = current->next;
if (odd_head == NULL) {
odd_head = current;
tail = current;
}
else {
tail->next = current; /*tail->next指向当前的奇数位*/
tail = tail->next; /*tail指向当前奇数位*/
}
}
else {
pre->next = current->next;
if(odd_head==NULL){
odd_head = current;
tail = current;
}
else {
tail->next = current;
tail = tail->next;
}
}
current = current->next;/*让current指向主链表的下一位*/
tail->next = NULL;
}
else{
pre = current;
current = current->next;/*让current指向主链表的下一位*/
}
}
return odd_head;
}
本文介绍如何使用C语言实现链表的读取与奇数值节点的分离。通过具体代码示例,详细讲解了如何构建链表并从中筛选奇数值节点形成新链表的过程。
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