spot7.org logo
Home PHP C# C++ Android Java Javascript Python IOS SQL HTML Categories

Heap-like data structure with fast random access?


If few members are affected when the best entity is grabbed, then you might be able to improve the runtime by using a linked list and an unordered map (each with the original set of entities), and a max heap. After removing the best entity from the end of the linked list you'll use the map to locate the affected entities, removing them from the list and adding the non-worthless entities to the max heap. Thereafter, the next best entity is the greater of the entity at the end of the list or the max entity in the heap. The advantage of this setup is that removal from the linked list is a constant time operation, and insertion into the max heap will be a relatively small (compared to the total number of entities) log time operation.

Because entities' values can only get worse, you can lazily remove them from the linked list - if the item is worthless then remove it, and if its value has changed then flag it as "changed." Check the "changed" flag on the entity at the end of the linked list, and if it's "true" then remove the entity and add it to the max-heap. The advantage of lazy updates is that you usually won't need to update items that are in the heap (you'll just need to update the value of items in the linked list), and if an item is changed and then later made worthless then you can remove it from the linked list without ever having to add it to the heap.


Categories : Algorithm

Related to : Heap-like data structure with fast random access?
How to access to other fields by refering data structure name
According to your comment, you want to store error descriptions in multiple languages. Do not embed your human-readable strings within your program code, instead use Resource files. I will not explain how to use them, instead I'll refer you to search online for ".net resources localization" to find plenty of articles and tutorials. Create a resource file for each language (give it an appropriate

Categories : C#
generate random alphanumeric key in Ms. Access
Drop this into a module and run it. You should get what you need. Sub test() Dim s As String * 7 'fixed length string with 7 characters Dim n As Integer Dim ch As Integer 'the character For n = 1 To Len(s) 'don't hardcode the length twice Do ch = Rnd() * 127 'This could be more efficient. '48 is '0', 57 is '9', 65 is 'A', 90 is 'Z', 97 is 'a', 122

Categories : Mysql
No random access method for Java Set
> boolean contains(Object o) Returns true if this set contains the specified element. (from https://docs.oracle.com/javase/7/docs/api/java/util/Set.html)

Categories : Java
Enable random access to collection with MongoDB
Based on similar questions, I've come to the conclusion that having a random field is a valid solution if the collection is dynamic, meaning that documents are inserted frequently. The more dynamic the collection is, the more 'random' access you can have.

Categories : Ruby On Rails
access violation assigning a structure's element with a character pointed by a pointer
strcpy(myInfo->id, *tmp); is definitely wrong, myInfo->id = *tmp; should work (as long as tmp is char* type) unless either myInfo or tmp point at bad info. There's not quite enough code here to be sure, but my guess would be that myInfo is not initialized properly. Maybe it is NULL. It might help to run the program in a debugger (you can compile with -g if using gcc to get better info`) to

Categories : C
Recently Add
why this assembly piece of code do jmp forever
Find out if segment is fully inside of polygon
Algorithm for coloring a hexagon tile map with minimum distance (3) for reoccurring colors
Sort pairs to be more consecutive
To find three unique numbers whose number of occurrence is even
Dealing with duplication between unit and integration tests
reflection and symmetry in back tracking queens
Big O analysis for method with multiple parameters
Divide Huge Array of Numbers in Buckets
Algorithm to find adjacent cells in a matrix
Why this code gives WA for Petersen Graph(codechef)?
Complexity of this prime number search algorithm
How to detect if a file has changed?
Given string x,y and z. Determine if z is a shuffle
Basic decryption for simple encryption algorithm
An efficient way to assign user_ids to huge dataset under certain conditions
What's a more efficient implementation of this puzzle?
Generating prime numbers in poly-time
What if I do not use G transpose in calculating Strongly Connected Components?
Dividing an array into optimum no of equal sum sublists
Counting derangements
How to iterate through all cases when partitioning objects
Algorithm: How to find closest element, having coordinates and dimension
Developing player rankings with ELO
How to transform two set of discrete points ( vectors ) to help plotting them on a common scale
Heap Sort Space Complexity
complex root finding algorithm
Every possible combination algorithm
RSA Cryptosystem - Retrieve m
Heap-like data structure with fast random access?
© Copyright 2017 spot7.org Publishing Limited. All rights reserved.