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.

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31 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 ...
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2answers
535 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 ...
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1answer
332 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
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1answer
173 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 ...
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5answers
2k 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 ...
6
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1answer
3k 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
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3answers
865 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
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2answers
212 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
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3answers
2k views

Pascal's triangle using C++ vectors

This is my C++ program. I wanted to print out Pascal's triangle. I let the user decide how many rows to print out. The first row is considered as 0, and is just: 1 I'm using vectors for this task. ...
8
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2answers
1k 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 ...
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3answers
2k 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
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2answers
246 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. ...
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1answer
72 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. ...
11
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1answer
125 views

IndexedVector - holding a vector of unique objects with faster finding elements

I am trying to write a class that will enable me to hold an std::vector of some unique objects, but faster finding elements already stored in a vector. I want the ...
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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
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2answers
1k 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 if ...
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0answers
175 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
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2answers
194 views

Manipulating and maintaining vector

Background I wrote a function update_list_v2(). And this function "maintains" a sorted list, g_list. ...
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6answers
2k 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
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1answer
445 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....
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1answer
89 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
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1answer
6k views

Vector with move constructor and move assignment operator [closed]

Please verify whether the code for a move constructor and a move assignment operator is correct. ...
2
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0answers
413 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
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3answers
94 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 ...
3
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1answer
391 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? <...
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1answer
727 views

C++ - Radix sort implementation

I have the following radix sort implementation: ...
4
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2answers
265 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 <...
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2answers
79 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
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2answers
778 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
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1answer
8k views

Calculating the determinant of a matrix

I wanted to do some exercise and came up with the idea of a good challenge (for my level of course). I tried to implement Laplace's algorithm for computing the determinant, recursively. ...
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6answers
5k 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 ...
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2answers
4k 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 ...
6
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1answer
83 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 ...
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2answers
198 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
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2answers
139 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
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1answer
655 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
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2answers
3k 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
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3answers
140 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 ...
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2answers
486 views

Remove continuous duplicate

I've made a little function to eliminate continuous duplicate from a std::vector. I have to use C++03. For example, if a vector of ints is composed of: 1,1,2,3,,3,...
5
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1answer
1k 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. ...
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2answers
1k views

Simple class to mimic a dynamic array

for my c++ class I was asked to write a class with the following characteristics: Implement a vector replacement that operates only on integers (you don't need to use templates like the normal STL)...
3
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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 ...
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2answers
129 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
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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) ...
2
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2answers
251 views

Rotation view for std::vector

I have this view class for constant time rotations of a std::vector: ...
7
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2answers
875 views

Fast variable-length stack allocator for vector<> in C++

I wrote a variable-length stack allocator for the vector<> class in C++ 11. In order to be able to allocate size dynamically at runtime I made use of the non-...
5
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1answer
115 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
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5answers
5k 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
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0answers
178 views

OCaml safe uninitialized array

One of the annoying things about OCaml arrays is that every cell has to be initialized when the array is first created. I'm trying to implement an array in OCaml that distinguishes ...
1
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2answers
745 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 ...