给定一个大小为N的数组和一个链表，链表中的元素将来自该数组，但也可以重复，按顺序对链表进行排序，则元素将出现在数组中。可以假定该数组覆盖了链表的所有元素。
arr [] = 
清单= 
排序清单= 
在亚马逊问
首先，创建一个散列表，以存储链表中元素的频率。然后，只需遍历列表，并针对arr [i]的每个元素检查has表中的频率，并通过arr [i]元素修改列表数据，直到达到其频率，最后打印该列表。
C++
// Efficient CPP program to sort given list in order
// elements are appearing in an array
#include
using namespace std;
// Linked list node
struct Node {
int data;
struct Node* next;
};
// function prototype for printing the list
void printList(struct Node*);
// Function to insert a node at the
// beginning of the linked list
void push(struct Node** head_ref, int new_data)
{
struct Node* new_node = new Node;
new_node -> data = new_data;
new_node -> next = *head_ref;
*head_ref = new_node;
}
// function to print the linked list
void printList(struct Node* head)
{
while (head != NULL) {
cout << head -> data << " -> ";
head = head -> next;
}
}
// Function that sort list in order of apperaing
// elements in an array
void sortlist(int arr[], int N, struct Node* head)
{
// Store frequencies of elements in a
// hash table.
unordered_map hash;
struct Node* temp = head;
while (temp) {
hash[temp -> data]++;
temp = temp -> next;
}
temp = head;
// One by one put elements in lis according
// to their appearance in array
for (int i = 0; i < N; i++) {
// Update 'frequency' nodes with value
// equal to arr[i]
int frequency = hash[arr[i]];
while (frequency--) {
// Modify list data as element
// appear in an array
temp -> data = arr[i];
temp = temp -> next;
}
}
}
// Driver Code
int main()
{
struct Node* head = NULL;
int arr[] = { 5, 1, 3, 2, 8 };
int N = sizeof(arr) / sizeof(arr[0]);
// creating the linked list
push(&head, 3);
push(&head, 2);
push(&head, 5);
push(&head, 8);
push(&head, 5);
push(&head, 2);
push(&head, 1);
// Function call to sort the list in order
// elements are apperaing in an array
sortlist(arr, N, head);
// print the modified linked list
cout << "Sorted List:" << endl;
printList(head);
return 0;
} Java
// Efficient JAVA program to sort given list in order
// elements are appearing in an array
import java.util.*;
class GFG
{
// Linked list node
static class Node
{
int data;
Node next;
};
// Function to insert a node at the
// beginning of the linked list
static Node push(Node head_ref, int new_data)
{
Node new_node = new Node();
new_node.data = new_data;
new_node.next = head_ref;
head_ref = new_node;
return head_ref;
}
// function to print the linked list
static void printList(Node head)
{
while (head != null)
{
System.out.print(head.data+ "->");
head = head.next;
}
}
// Function that sort list in order of apperaing
// elements in an array
static void sortlist(int arr[], int N, Node head)
{
// Store frequencies of elements in a
// hash table.
HashMap hash = new HashMap();
Node temp = head;
while (temp != null)
{
if(hash.containsKey(temp.data))
hash.put(temp.data,hash.get(temp.data) + 1);
else
hash.put(temp.data,1);
temp = temp.next;
}
temp = head;
// One by one put elements in lis according
// to their appearance in array
for (int i = 0; i < N; i++)
{
// Update 'frequency' nodes with value
// equal to arr[i]
int frequency = hash.get(arr[i]);
while (frequency-->0)
{
// Modify list data as element
// appear in an array
temp.data = arr[i];
temp = temp.next;
}
}
}
// Driver Code
public static void main(String[] args)
{
Node head = null;
int arr[] = { 5, 1, 3, 2, 8 };
int N = arr.length;
// creating the linked list
head = push(head, 3);
head = push(head, 2);
head = push(head, 5);
head = push(head, 8);
head = push(head, 5);
head = push(head, 2);
head = push(head, 1);
// Function call to sort the list in order
// elements are apperaing in an array
sortlist(arr, N, head);
// print the modified linked list
System.out.print("Sorted List:" +"\n");
printList(head);
}
}
// This code is contributed by PrinciRaj1992 Python3
# Efficient Python3 program to sort given list in order
# elements are appearing in an array
# Linked list node
class Node:
def __init__(self):
self.data = 0
self.next = None
# Function to insert a node at the
# beginning of the linked list
def push( head_ref, new_data):
new_node = Node()
new_node.data = new_data
new_node.next = head_ref
head_ref = new_node
return head_ref
# function to print the linked list
def printList( head):
while (head != None):
print(head.data, end = "->")
head = head.next
# Function that sort list in order of apperaing
# elements in an array
def sortlist( arr, N, head):
# Store frequencies of elements in a
# hash table.
hash = dict()
temp = head
while (temp != None) :
hash[temp.data] = hash.get(temp.data, 0) + 1
temp = temp.next
temp = head
# One by one put elements in lis according
# to their appearance in array
for i in range(N):
# Update 'frequency' nodes with value
# equal to arr[i]
frequency = hash.get(arr[i],0)
while (frequency > 0) :
frequency= frequency-1
# Modify list data as element
# appear in an array
temp.data = arr[i]
temp = temp.next
# Driver Code
head = None
arr = [5, 1, 3, 2, 8 ]
N = len(arr)
# creating the linked list
head = push(head, 3)
head = push(head, 2)
head = push(head, 5)
head = push(head, 8)
head = push(head, 5)
head = push(head, 2)
head = push(head, 1)
# Function call to sort the list in order
# elements are apperaing in an array
sortlist(arr, N, head)
# print the modified linked list
print("Sorted List:" )
printList(head)
# This code is contributed by Arnab KunduC#
// Efficient C# program to sort given list in order
// elements are appearing in an array
using System;
using System.Collections.Generic;
class GFG
{
// Linked list node
public class Node
{
public int data;
public Node next;
};
// Function to insert a node at the
// beginning of the linked list
static Node push(Node head_ref, int new_data)
{
Node new_node = new Node();
new_node.data = new_data;
new_node.next = head_ref;
head_ref = new_node;
return head_ref;
}
// function to print the linked list
static void printList(Node head)
{
while (head != null)
{
Console.Write(head.data + "->");
head = head.next;
}
}
// Function that sort list in order of apperaing
// elements in an array
static void sortlist(int []arr, int N, Node head)
{
// Store frequencies of elements in a
// hash table.
Dictionary hash = new Dictionary();
Node temp = head;
while (temp != null)
{
if(hash.ContainsKey(temp.data))
hash[temp.data] = hash[temp.data] + 1;
else
hash.Add(temp.data, 1);
temp = temp.next;
}
temp = head;
// One by one put elements in lis according
// to their appearance in array
for (int i = 0; i < N; i++)
{
// Update 'frequency' nodes with value
// equal to arr[i]
int frequency = hash[arr[i]];
while (frequency-->0)
{
// Modify list data as element
// appear in an array
temp.data = arr[i];
temp = temp.next;
}
}
}
// Driver Code
public static void Main(String[] args)
{
Node head = null;
int []arr = { 5, 1, 3, 2, 8 };
int N = arr.Length;
// creating the linked list
head = push(head, 3);
head = push(head, 2);
head = push(head, 5);
head = push(head, 8);
head = push(head, 5);
head = push(head, 2);
head = push(head, 1);
// Function call to sort the list in order
// elements are apperaing in an array
sortlist(arr, N, head);
// print the modified linked list
Console.Write("Sorted List:" + "\n");
printList(head);
}
}
// This code is contributed by 29AjayKumar 输出 ：
Sort list:
5 -> 5 -> 1 -> 3 -> 2 -> 2 -> 8