連結串列交替節點的乘積
給定n個節點,任務是列印連結串列中交替節點的乘積。程式必須只打印交替節點的乘積,而無需實際更改節點的位置。
示例
Input -: 10 20 30 40 50 60 Output -: 15000
在上例中,從第一個節點10開始,交替節點為10、30、50,它們的乘積為10*30*50 = 15000。
在上圖中,藍色節點是交替節點(從第一個節點開始),紅色節點是不考慮的節點。
下面使用的方案如下
取一個臨時指標,假設為temp,型別為節點
將此temp指標設定為head指標指向的第一個節點
當(temp->next!=NULL && temp!=NULL && temp->next->next!=NULL) 條件成立時,移動temp到temp->next->next
設定product=product*(temp->data)
演算法
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
程式碼
#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; }
輸出
linked list is : 10 20 30 40 50 60 product of alternate nodes is : 15000
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