linked-list | 易学教程

List destructor in C++

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I've just implemented the Linked List. It works perfectly fine but even tough I've seen notation I am unable to create working destructor on Node, that's why it's unimplemented here in code. I need to implement working destructor on node Destructor of List but this one is simple I will just use the destructor from Node class(but I need this one). Make the List friendly to Node so I will not have to use getNext(), but I think I can handle it myself(not sure how, but I'll find out). Please look at the code it is perfectly fine, just will work if you copy it. #include <cstdio> #include <cmath>

Partitioning a linked list

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I am trying to solve this algorithmic problem based on linked list data structure. The question is as follows: Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the original relative order of the nodes in each of the two partitions. For example, Given 1->4->3->2->5->2 and x = 3, return 1->2->2->4->3->5. My solution to the problem is: /** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */ public class Solution { public

Concatenate two java.util.LinkedList in constant time

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问题 I'm working on some piece of code, which is quite hot, and I need to add elements of one LinkedList ( l1 ) to another LinkedList ( l2 ). It's not possible to use addAll(Collection) method as it uses Iterator to iterate over the entire Collection . It seems to me that it should be possible to just set the last Node of l1 to point to the first Node of l2 . But I couldn't find any suitable method for this? Do I need my own LinkedList implementation to get that? 回答1: According to the comments,

Why don't F# lists have a tail pointer

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问题 Or phrased another way, what kind of benefits do you get from having a basic, singly linked list with only a head pointer? The benefits of a tail pointer that I can see are: O(1) list concatenation O(1) Appending stuff to the right side of the list Both of which are rather convenient things to have, as opposed to O(n) list concatenation (where n is the length of the left-side list?). What advantages does dropping the tail pointer have? 回答1: F#, like many other functional[-ish] languages, has

Cannot convert from Node<E> to Node<E>?

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I am just doing some practice from one of my books, and I was curious about why I am getting the following error in eclipse: Type mismatch: cannot convert from type DoublyLinkedList.Node<E> to DoublyLinkedList.Node<E> Code: import java.util.Iterator; import java.util.ListIterator; import java.util.NoSuchElementException; public class DoublyLinkedList<E extends Comparable<E>> implements Iterable<E>{ private int size = 0; private Node<E> head; private Node<E> tail; /** Returns a list iterator object for the list at * the specified index */ public DoublyLinkedList(){ } private static class Node<E

What is an array linked structure or node array?

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问题 I am a couple of java data data structure exercises. Here is the exercise I am currently doing Add an array-linked hierarchy to the overall structure. Use the following names: AbstractNodeArrayMyList , NodeArraySorted , and NodeArrayUnsorted I've already implemented abstract array list, sorted array list, unsorted array list, abstract linked list, sorted linked list, and unsorted linked list. However I am confused about what this array linked structure or node array is. I tried doing a google

Doesn't qsort() C library function work on linked lists?

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问题 I am trying to sort a singly linked list which has been created and all its items,pointers initialized. I am trying to use qsort() C library function as shown below. It doesn't seem to sort the list. It is giving me compiler error saying: left of 'item' specifies undefined struct/union 'LINKED_LIST_S' at line shown below in the code. struct LINKED_LIST_S { int item; struct LINKED_LIST_S * next; } ; typedef int (*cmpfn)(const void *ptr1, const void *ptr2); int mylistsort(my_list_t list, cmpfn

Appending unique values only in a linked list in C

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问题 typedef struct child {int count; char word[100]; inner_list*next;} child; typedef struct parent { char data [100]; child * head; int count; parent * next; } parent; void append(child **q,char num[100],int size) { child *temp,*r,*temp2,*temp3; parent *out=NULL; temp = *q; temp2 = *q; temp3 = *q; char *str; if(*q==NULL) { temp = (child *)malloc(sizeof(child)); strcpy(temp->word,num); temp->count =size; temp->next=NULL; *q=temp; } else { temp = *q; while(temp->next !=NULL) { temp=temp->next; } r

Reading .csv file into C LinkedList

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问题 I have the following struct : struct NODE { char username[50]; char password[50]; char usertype[50]; struct NODE *next; } *head=NULL; I would like to read from a .csv file, say database.csv of the form username, password, usertype , tokenize each line into tokens using strtok and put each token inside the right field. For instance, my file looks like this: johnnydepp, pirate123, user tonystark, iron456, sysop I keep reading on C LinkedList , but I cannot figure it out. Any help would be

List using with references, changes behavior when used as a member

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Experimenting with this question/answer https://stackoverflow.com/a/50649120/225186 I produced what seems to be a legal recursive self referential class that implements a circular list: struct node{ int val; node const& next; }; int main(){ node s{3, {4, s}}; assert(s.val == 3); assert(s.next.val == 4); assert(&s.next.next == &s); assert(s.next.next.val == 3); } However, when I try put this as a member of a larger class I get a warning from the compiler and the behavior changes. struct A{ node n; int i; A(int a, int b) : n{a, {b, n}}{} // warning here, also tried n{a, node{b, n}} }; int main()