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Questions tagged [vectors]

Vectors are sequence containers representing arrays that can change in size. For questions about geometric or algebraic vectors, use [coordinate-system] instead.

8
votes
2answers
94 views

Read file into vector<byte>

I need to read a range of bytes from a file and return it as a std::vector<std::byte>. My current code looks like this: ...
9
votes
2answers
1k views

Implement Own Vector Class in C++

I am preparing for an interview and came to know about this question: implement a vector class in C++. I thought of how I would write it an interview and included the code below. The things I know I ...
6
votes
1answer
128 views

C++20 standard compatible vector

I decided to write my own vector class template for learning purposes. My main goal was a correct interpretation of C++20 standard (as of n4810). I took some liberties and decided to use concepts ...
1
vote
1answer
66 views

Vector calculation in Rust

Hi I am trying to get into Rust by implementing a small library for vector calculations. I am mainly asking to point out whether I chose a valid approach. I also am interested in comments on the ...
4
votes
1answer
89 views

C# System.Numerics.Vector<T> Clamp

The software that I develop uses large floating-point arrays up to the maximum size that can be allocated in C#. I have a large number of algorithms such as convolutions and filters that get executed ...
1
vote
0answers
24 views

Average histogram combining multiple files and vector of vectors (in c++)

I run a program of simulation N times (I use each time a different random numbers to initialize it). The results of the program are stored in 2N directories: every run produces two approximations. The ...
6
votes
2answers
133 views

Simulation of a banking system with an Account class in C++

I have been learning C++ and recently I have started practicing classes. I made this simulation of a banking system with an Account class. I would like to hear feedback on my code, what is good - what ...
1
vote
1answer
43 views

Clone Vector in rust except at one index [closed]

Let's consider you want to clone all items of a vector orig except the item of index i should be taken from alternative value <...
4
votes
1answer
113 views

std::vector free list

I'm trying to implement a free list by using a std::vector as its growable buffer. The reason I made this instead of just adding/removing elements directly into a ...
2
votes
0answers
108 views

VBA array functions: push, pop, shift, unshift

I want to write my snake game procedurally, using as much windows call as I can so as to practice. Looking into GetAsyncKeyState to capture keyboard inputs and play sound functions. Also making a ...
7
votes
5answers
782 views

Vector-transposing function

I profiled a library I'm writing that uses vector transposes and found that I am spending a good bit of time doing the following transpose. I am using a std::vector ...
5
votes
1answer
322 views

Implementation of thread-safe vector

I have implemented a thread safe vector, based on std::thread and std::vector. I am new to many of the patterns used in threading and was wondering if there's a more efficient way the locking can be ...
4
votes
3answers
849 views

Get length of the longest sequence of numbers with the same sign

I need to get length of the longest sequence of numbers with the same sign. Assumes that zero is positive. For example: ...
11
votes
2answers
95 views

Dynamic vector of void* in C

I have implemented a simple dynamic vector library in C. It is a header-only library. Full library listing - void_vector.h: ...
8
votes
2answers
941 views

C++11 Vector with move semantics

I am practicing move semantics and placement new by writing a custom Vector class but I am not confident that I use them right. I would really appreciate some pieces of advice regarding my code. Here ...
9
votes
3answers
859 views

Simple re-implementation of std::vector

Here is a simple reimplementation of most of std::vector. I want to check if I implement it correctly but the standard libraries source code is not very readable ...
3
votes
2answers
118 views

Simple Matrix Template Class

I wanted to make a matrix template class to see if I can learn how to use templates, work on figuring out the indexing in loops, and making an interface so the user can know if an operation will work. ...
1
vote
1answer
60 views

Header-only vector implementation in C

I tried to make a generic, header-only vector thingy I can use in other projects in the future. I omitted documentation comments because it's already quite long. ...
8
votes
4answers
2k views

Most efficient way to find an entry in a C++ vector

I'm trying to construct an output table containing 80 rows of table status, that could be EMPTY or USED as below ...
4
votes
2answers
356 views

Data Structures for Counting Duplicates and using std::vector::erase

Problem Dupe detection for a vector of ints. I simply want a count of the unique input characters that occurred at least twice. The goal is to count a dupe only once and ignore that input character ...
1
vote
0answers
103 views

Qsort in C++ using vector

I tried to make a simple qsort() function in a functional way, it takes a vector and a bool pred() Suggestions as to make it more functional, optimize it, and/or ...
3
votes
2answers
182 views

Manipulating and maintaining vector

Background I wrote a function update_list_v2(). And this function "maintains" a sorted list, g_list. ...
8
votes
6answers
285 views

Removing by indices several elements from a vector

From a sorted vector of indices (toRemove), I would like to remove from another vector (v) the elements at these indices. Note ...
1
vote
1answer
138 views

Median of a Vector assignment

I've been reading Bjarne's Principles in Programming and was given some code to demonstrate the usage of vectors and how we can return specific values for certain functionality such as mean and median....
1
vote
1answer
61 views

Convert a type u16 number to a matrix (Vec<Vec<u8>> or array) of 4 x 4

I am a Rust newbie and I am not familiar with all the iterator options. This is what I have so far. How can I make this better or at least avoid collecting twice into a Vec? ...
2
votes
0answers
349 views

A multithreaded, growable vector with immutable elements, which has wait-free reads

I wrote a small vector with a few lines of unsafe Rust. The idea is to have a vector, which can be read from simultaneously, but it needs the ability to grow. To realize that, the storage is ...
3
votes
3answers
83 views

Calculate total, minimum, maximum and mean from a set of distances

I have only begun to learn C++ and am reading through the book, "Programming Principles and Practices Using C++". This bit of code is my attempt to complete exercise 3 at the end of chapter 4. The ...
1
vote
1answer
419 views

C++ - Radix sort implementation

I have the following radix sort implementation: ...
4
votes
2answers
215 views

A simple Vector implementation

Just made a simple Vec class, nothing fancy but I am open to suggestions for improvements. Of course, this is not suppose to replace or used for the same tasks as <...
10
votes
4answers
3k views

Basic iterator supporting vector implementation

On the fly, I just implemented this iterator supporting vector class to understand how range-based for loop works. It's really basic but let me know what can be improved. Vector.h ...
1
vote
2answers
65 views

Generic Vector Class using smart_pointers

I have decided to rewrite what I did here, following the suggestions to use smart pointers. I will rewrite the other data structures as well using smart pointers where appropriate. I just want to see ...
4
votes
2answers
419 views

std::vector for pods

I am learning c++ and read why we can't use realloc() in std::vector, but i think we can use realloc() for pods, so here is my attempt to write std::vector like class template specialized for PODs <...
3
votes
1answer
267 views

Thread-safe arraylist with get, put, add, remove functions

I am preparing for multithreading interview questions and I don't have much experience with multithreading. I referred some online article to come up with a solution. Is this solution appropriate? <...
12
votes
6answers
4k views

Modern Vector implementation

Please give me some feedback on my attempt at a vector. I wanted this to be the lowest level concept of a vector that I'm using, so I'm primarily concerned with speed, and I would build wrappers ...
3
votes
2answers
1k views

Snake Game in C++ using OOP

I am currently a student and I have an assignment in my OOP C++ course where I need to create a snake game using these specific requirements. I added some features into snake to fit these requirements ...
5
votes
1answer
72 views

Binary searching the turning point of a function

The problem You are given a list of \$ n \$ positive integers. Your task is to split the list into \$ k \$ subarrays so that the largest subarray sum is minimized. The input On the first line you ...
3
votes
2answers
130 views

Comment on the style of this C++ class for a 2D Vector

I wrote a template class for a 2D vector that is intended to provide 2D vector arithmetic to be used in a Physics simulation program. Note that x and y are public or ease of use since encapsulation ...
6
votes
2answers
110 views

Dynamically sized queue

This is my first deep dive into C, and I want to make sure that I'm not doing anything stupid. The code below creates an "Array List" of sorts, which automatically resizes itself. This code is meant ...
6
votes
1answer
405 views

Implementation of resizable array (Vector or ArrayList) in C

I've implemented a very simple resizable integer array in C, only including functionality to add and remove elements at various indexes. I haven't looked at using void pointers to handle any type of ...
3
votes
2answers
2k views

Sequential and parallel addition of 2 vectors

I have done sequential and parallel addition of 2 vectors that I have filled with some dummy values. I am also measuring the time of execution for both, sequential and parallel execution. ...
3
votes
3answers
120 views

Generic vector class, follow up

This is a follow up from a post I made here. I am creating a generic vector class. I have changed the code around considerably since I had so many errors (decided to just re-do it from scratch). I ...
5
votes
1answer
601 views

High performance primitive dynamic array

Unfortunately Java does not support generic programming with primitive types. Using collections classes with boxed types may increase memory usage by a factor of 3-4 (e.g. ...
3
votes
1answer
90 views

Representing destinations in a square

I've written a program following the instructions of an exam paper. There are no solutions available so I would appreciate a feedback. I'm concerned with main in ...
0
votes
2answers
91 views

Comparing two vectors of arbitrary size, block by block [closed]

I am trying to compare two vectors which are of size of multiple of 4. Each vector block has a unique number it e.g {0,0,0,0}, {0,0,0,1}, {0,0,0,2} or {0,0,0,0,0,0,0,1,0,0,0,2} and {0,0,0,2,0,0,0,1} ...
11
votes
5answers
2k views

A simple program with trains and inheritance

Here it is my program. I'm especially worried about the main because I know that one must be careful while instancing vectors of "inherited" objects. The code I have works fine (as far as I can see) ...
5
votes
1answer
108 views

C++ container — variable byte coded numbers list

I'm writing a container for unsigned integers, which uses variable byte coding. It works but some decisions I took look ugly so I would be glad if you gave me some hints for improving the design. I ...
28
votes
5answers
4k views

C++ Vector Clone

I'm learning C++, so I decided to make a simpler clone of std::vector. Concerns: I have seen people defining methods outside of the class, and only prototyping ...
6
votes
1answer
246 views

Given a vector and a target sum, returns zero-based indices of any two distinct elements whose sum is equal to the target sum

I am trying to solve 4. Two Sum from this set of C++ interview questions. As far as I can think this solution has a time complexity of \$O(n \log n)\$ can it be further optimized? Write a function ...
1
vote
2answers
415 views

Text-based game involving Objects placed inside Rooms [closed]

I'm a coding newbie (and despite what my user name may imply I am far from a pro), and I'm trying to write my own text-based adventure game. I have two questions. First, I want to implement an ...
3
votes
2answers
576 views

Pairwise Hamming Distance [closed]

This is a program to return the sum of pairwise Hamming Distance of the binary string representation of a vector of integers. Please let me know how I can make this better? ...