链表交替节点的乘积
给定n个节点,任务是打印链表中交替节点的乘积。程序必须只打印交替节点的乘积,而无需实际更改节点的位置。
示例
Input -: 10 20 30 40 50 60 Output -: 15000
在上例中,从第一个节点10开始,交替节点为10、30、50,它们的乘积为10*30*50 = 15000。

在上图中,蓝色节点是交替节点(从第一个节点开始),红色节点是不考虑的节点。
下面使用的方案如下
取一个临时指针,假设为temp,类型为节点
将此temp指针设置为head指针指向的第一个节点
当(temp->next!=NULL && temp!=NULL && temp->next->next!=NULL) 条件成立时,移动temp到temp->next->next
设置product=product*(temp->data)
算法
Start Step 1 -> create structure of a node and temp, next and head as pointer to a structure node struct node int data struct node *next, *head, *temp End Step 2 -> declare function to insert a node in a list void insert(int val) struct node* newnode = (struct node*)malloc(sizeof(struct node)) newnode->data = val IF head= NULL set head = newnode set head->next = NULL End Else Set temp=head Loop While temp->next!=NULL Set temp=temp->next End Set newnode->next=NULL Set temp->next=newnode End Step 3 -> Declare a function to display list void display() IF head=NULL Print no node End Else Set temp=head Loop While temp!=NULL Print temp->data Set temp=temp->next End End Step 4 -> declare a function to find alternate nodes void alternate() declare int product Set temp=head Set product=head->data Loop While(temp->next!=NULL && temp!=NULL && temp->next- >next!=NULL) Set temp=temp->next->next Set product=product * (temp->data) End Print product Step 5 -> in main() Create nodes using struct node* head = NULL; Call function insert(10) to insert a node Call display() to display the list Call alternate() to find alternate nodes product Stop
代码
#include<stdio.h>
#include<stdlib.h>
//structure of a node
struct node {
int data;
struct node *next;
}*head,*temp;
//function for inserting nodes into a list
void insert(int val) {
struct node* newnode = (struct node*)malloc(sizeof(struct node));
newnode->data = val;
if(head == NULL) {
head = newnode;
head->next = NULL;
} else {
temp=head;
while(temp->next!=NULL) {
temp=temp->next;
}
newnode->next=NULL;
temp->next=newnode;
}
}
//function for displaying a list
void display() {
if(head==NULL)
printf("no node ");
else {
temp=head;
while(temp!=NULL) {
printf("%d ",temp->data);
temp=temp->next;
}
}
}
//function for finding alternate elements
void alternate() {
int product;
temp=head;
product=head->data;
while(temp->next!=NULL && temp!=NULL && temp->next->next!=NULL) {
temp=temp->next->next;
product=product * (temp->data);
}
printf("
product of alternate nodes is %d : " ,product);
}
int main() {
//creating list
struct node* head = NULL;
//inserting elements into a list
insert(10);
insert(20);
insert(30);
insert(40);
insert(50);
insert(60);
//displaying the list
printf("linked list is : ");
display();
//calling alternate function for finding product
alternate();
return 0;
}输出
linked list is : 10 20 30 40 50 60 product of alternate nodes is : 15000
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