📅  最后修改于: 2020-10-15 05:29:52             🧑  作者: Mango
在此程序中,我们将创建一个双向链接列表,然后遍历该列表以找出最小和最大节点。
我们将维护两个变量min和max。最小值将保存最小值节点,最大值将保存最大值节点。在上面的示例中,1将是最小值节点,而9将是最大值节点。
#Represent a node of doubly linked list
class Node:
def __init__(self,data):
self.data = data;
self.previous = None;
self.next = None;
class MinMax:
#Represent the head and tail of the doubly linked list
def __init__(self):
self.head = None;
self.tail = None;
#addNode() will add a node to the list
def addNode(self, data):
#Create a new node
newNode = Node(data);
#If list is empty
if(self.head == None):
#Both head and tail will point to newNode
self.head = self.tail = newNode;
#head's previous will point to None
self.head.previous = None;
#tail's next will point to None, as it is the last node of the list
self.tail.next = None;
else:
#newNode will be added after tail such that tail's next will point to newNode
self.tail.next = newNode;
#newNode's previous will point to tail
newNode.previous = self.tail;
#newNode will become new tail
self.tail = newNode;
#As it is last node, tail's next will point to None
self.tail.next = None;
#MinimumNode() will find out minimum value node in the list
def minimumNode(self):
#Node current will point to head
current = self.head;
#Checks if list is empty
if(self.head == None):
print("List is empty");
return 0;
else:
#Initially, min will store the value of head's data
min = self.head.data;
while(current != None):
#If value of min is greater than current's data
#Then, replace value of min with current node's data
if(min > current.data):
min = current.data;
current = current.next;
return min;
#MaximumNode() will find out maximum value node in the list
def maximumNode(self):
#Node current will point to head
current = self.head;
#Checks if list is empty
if(self.head == None):
print("List is empty");
return 0;
else:
#Initially, max will store the value of head's data
max = self.head.data;
#If value of max is lesser than current's data
#Then, replace value of max with current node's data
while(current != None):
if(current.data > max):
max = current.data;
current = current.next;
return max;
dList = MinMax();
#Add nodes to the list
dList.addNode(5);
dList.addNode(7);
dList.addNode(9);
dList.addNode(1);
dList.addNode(2);
#Prints the minimum value node in the list
print("Minimum value node in the list: "+ str(dList.minimumNode()));
#Prints the maximum value node in the list
print("Maximum value node in the list: "+ str(dList.maximumNode()));
输出:
Minimum value node in the list: 1
Maximum value node in the list: 9
#include
//Represent a node of the doubly linked list
struct node{
int data;
struct node *previous;
struct node *next;
};
//Represent the head and tail of the doubly linked list
struct node *head, *tail = NULL;
//addNode() will add a node to the list
void addNode(int data) {
//Create a new node
struct node *newNode = (struct node*)malloc(sizeof(struct node));
newNode->data = data;
//If list is empty
if(head == NULL) {
//Both head and tail will point to newNode
head = tail = newNode;
//head's previous will point to NULL
head->previous = NULL;
//tail's next will point to NULL, as it is the last node of the list
tail->next = NULL;
}
else {
//newNode will be added after tail such that tail's next will point to newNode
tail->next = newNode;
//newNode's previous will point to tail
newNode->previous = tail;
//newNode will become new tail
tail = newNode;
//As it is last node, tail's next will point to NULL
tail->next = NULL;
}
}
//MinimumNode() will find out minimum value node in the list
int minimumNode() {
//Node current will point to head
struct node *current = head;
int min;
//Checks if list is empty
if(head == NULL) {
printf("List is empty\n");
return 0;
}
else {
//Initially, min will store the value of head's data
min = head->data;
while(current != NULL) {
//If value of min is greater than current's data
//Then, replace value of min with current node's data
if(min > current->data)
min = current->data;
current = current->next;
}
}
return min;
}
//MaximumNode() will find out maximum value node in the list
int maximumNode() {
//Node current will point to head
struct node *current = head;
int max;
//Checks if list is empty
if(head == NULL) {
printf("List is empty\n");
return 0;
}
else {
//Initially, max will store the value of head's data
max = head->data;
//If value of max is lesser than current's data
//Then, replace value of max with current node's data
while(current != NULL) {
if(current->data > max)
max = current->data;
current = current->next;
}
}
return max;
}
int main()
{
//Add nodes to the list
addNode(5);
addNode(7);
addNode(9);
addNode(1);
addNode(2);
//Prints the minimum value node in the list
printf("Minimum value node in the list: %d\n", minimumNode());
//Prints the maximum value node in the list
printf("Maximum value node in the list: %d", maximumNode());
return 0;
}
输出:
Minimum value node in the list: 1
Maximum value node in the list: 9
public class MinMax {
//Represent a node of the doubly linked list
class Node{
int data;
Node previous;
Node next;
public Node(int data) {
this.data = data;
}
}
//Represent the head and tail of the doubly linked list
Node head, tail = null;
//addNode() will add a node to the list
public void addNode(int data) {
//Create a new node
Node newNode = new Node(data);
//If list is empty
if(head == null) {
//Both head and tail will point to newNode
head = tail = newNode;
//head's previous will point to null
head.previous = null;
//tail's next will point to null, as it is the last node of the list
tail.next = null;
}
else {
//newNode will be added after tail such that tail's next will point to newNode
tail.next = newNode;
//newNode's previous will point to tail
newNode.previous = tail;
//newNode will become new tail
tail = newNode;
//As it is last node, tail's next will point to null
tail.next = null;
}
}
//MinimumNode() will find out minimum value node in the list
public int minimumNode() {
//Node current will point to head
Node current = head;
int min;
//Checks if list is empty
if(head == null) {
System.out.println("List is empty");
return 0;
}
else {
//Initially, min will store the value of head's data
min = head.data;
while(current != null) {
//If the value of min is greater than the current's data
//Then, replace the value of min with current node's data
if(min > current.data)
min = current.data;
current = current.next;
}
}
return min;
}
//MaximumNode() will find out maximum value node in the list
public int maximumNode() {
//Node current will point to head
Node current = head;
int max;
//Checks if list is empty
if(head == null) {
System.out.println("List is empty");
return 0;
}
else {
//Initially, max will store the value of head's data
max = head.data;
//If value of max is lesser than current's data
//Then, replace value of max with current node's data
while(current != null) {
if(current.data > max)
max = current.data;
current = current.next;
}
}
return max;
}
public static void main(String[] args) {
MinMax dList = new MinMax();
//Add nodes to the list
dList.addNode(5);
dList.addNode(7);
dList.addNode(9);
dList.addNode(1);
dList.addNode(2);
//Prints the minimum value node in the list
System.out.println("Minimum value node in the list: "+ dList.minimumNode());
//Prints the maximum value node in the list
System.out.println("Maximum value node in the list: "+ dList.maximumNode());
}
}
输出:
Minimum value node in the list: 1
Maximum value node in the list: 9
using System;
namespace DoublyLinkedList
{
public class Program
{
//Represent a node of the doubly linked list
public class Node{
public T data;
public Node previous;
public Node next;
public Node(T value) {
data = value;
}
}
public class MinMax where T : IComparable{
//Represent the head and tail of the doubly linked list
protected Node head = null;
protected Node tail = null;
//addNode() will add a node to the list
public void addNode(T data) {
//Create a new node
Node newNode = new Node(data);
//If list is empty
if(head == null) {
//Both head and tail will point to newNode
head = tail = newNode;
//head's previous will point to null
head.previous = null;
//tail's next will point to null, as it is the last node of the list
tail.next = null;
}
else {
//newNode will be added after tail such that tail's next will point to newNode
tail.next = newNode;
//newNode's previous will point to tail
newNode.previous = tail;
//newNode will become new tail
tail = newNode;
//As it is last node, tail's next will point to null
tail.next = null;
}
}
//MinimumNode() will find out minimum value node in the list
public T minimumNode() {
//Node current will point to head
Node current = head;
T min;
//Checks if list is empty
if(head == null) {
Console.WriteLine("List is empty");
return default(T);
}
else {
//Initially, min will store the value of head's data
min = head.data;
while(current != null) {
//If value of min is greater than current's data
//Then, replace value of min with current node's data
if(min.CompareTo(current.data) > 0)
min = current.data;
current = current.next;
}
}
return min;
}
//MaximumNode() will find out maximum value node in the list
public T maximumNode() {
//Node current will point to head
Node current = head;
T max;
//Checks if list is empty
if(head == null) {
Console.WriteLine("List is empty");
return default(T);
}
else {
//Initially, max will store the value of head's data
max = head.data;
//If value of max is lesser than current's data
//Then, replace value of max with current node's data
while(current != null) {
if(current.data.CompareTo(max) > 0)
max = current.data;
current = current.next;
}
}
return max;
}
}
public static void Main()
{
MinMax dList = new MinMax();
//Add nodes to the list
dList.addNode(5);
dList.addNode(7);
dList.addNode(9);
dList.addNode(1);
dList.addNode(2);
//Prints the minimum value node in the list
Console.WriteLine("Minimum value node in the list: "+ dList.minimumNode());
//Prints the maximum value node in the list
Console.WriteLine("Maximum value node in the list: "+ dList.maximumNode());
}
}
}
输出:
Minimum value node in the list: 1
Maximum value node in the list: 9
data = $data;
}
}
class MinMax{
//Represent the head and tail of the doubly linked list
public $head;
public $tail;
function __construct(){
$this->head = NULL;
$this->tail = NULL;
}
//addNode() will add a node to the list
function addNode($data){
//Create a new node
$newNode = new Node($data);
//If list is empty
if($this->head == NULL) {
//Both head and tail will point to newNode
$this->head = $this->tail = $newNode;
//head's previous will point to NULL
$this->head->previous = NULL;
//tail's next will point to NULL, as it is the last node of the list
$this->tail->next = NULL;
}
else {
//newNode will be added after tail such that tail's next will point to newNode
$this->tail->next = $newNode;
//newNode's previous will point to tail
$newNode->previous = $this->tail;
//newNode will become new tail
$this->tail = $newNode;
//As it is last node, tail's next will point to NULL
$this->tail->next = NULL;
}
}
//MinimumNode() will find out minimum value node in the list
function minimumNode() {
//Node current will point to head
$current = $this->head;
//Checks if list is empty
if($this->head == NULL) {
print("List is empty
");
return 0;
}
else {
//Initially, min will store the value of head's data
$min = $this->head->data;
while($current != NULL) {
//If value of min is greater than current's data
//Then, replace value of min with current node's data
if($min > $current->data)
$min = $current->data;
$current = $current->next;
}
}
return $min;
}
//MaximumNode() will find out maximum value node in the list
function maximumNode() {
//Node current will point to head
$current = $this->head;
//Checks if list is empty
if($this->head == NULL) {
print("List is empty
");
return 0;
}
else {
//Initially, max will store the value of head's data
$max = $this->head->data;
//If value of max is lesser than current's data
//Then, replace value of max with current node's data
while($current != NULL) {
if($current->data > $max)
$max = $current->data;
$current = $current->next;
}
}
return $max;
}
}
$dList = new MinMax();
//Add nodes to the list
$dList->addNode(5);
$dList->addNode(7);
$dList->addNode(9);
$dList->addNode(1);
$dList->addNode(2);
//Prints the minimum value node in the list
print("Minimum value node in the list: " . $dList->minimumNode());
print("
");
//Prints the maximum value node in the list
print("Maximum value node in the list: " . $dList->maximumNode());
?>
输出:
Minimum value node in the list: 1
Maximum value node in the list: 9