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.
311
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Positive Segments
I'm trying to solve the following question:
You have an array A of size n, containing −1 or 1 only, and s segments (not necessarily different). Each segment is defined by 2 integers li and ri (1 ≤ li ...
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Market Portfolio Binary Search Tree [closed]
I'm trying to solve the following problem here:
First line of input contains the number of days D. The next d lines contains a character c and a number x. If c is B, then buy stock . If c is S, then ...
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O(nlogn) Lexicographically minimal rotation code but tle on this particular case
Based on a small suggestion here , this code tries to find lexicographically minimal rotation (question) by successively comparing two adjacent substrings in the very left , that can potentially give ...
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C++ custom vector class implementation
I've developed a custom vector class in C++, complete with functionalities like assignment, push_back(), emplace_back(), pop_back(), clear(), and size(). I would greatly appreciate any feedback on ...
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256
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C++ std::vector Implementation
Implementation of the vector class in C++ for learning purposes. Tried to implement interesting parts from the API shown on cppreference.com, but some elements like ...
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377
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C23 Vector Macro Implementation
I'm trying to implement a simple type-generic Vector with macros using the newest features of C23. Looking for any advice about macro design and pitfalls because I generally avoid macros at all costs. ...
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Implementing a function that takes in 2 collections of strings and compares them as if they are unordered in Rust
I'm new to Rust and I would like to implement a function to compare 2 collections of strings. The function should compare them as if they are unordered.
In Python, I would implement something like ...
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1k
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Compute "negative" version of vector of vectors
Given a std::vector<std::vector<double>> (e.g., representing some points in a space with D dimensions), I want to ...
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254
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C macro based dynamic array library
This library is a fork of eteran/c-vector. It is macro based, so that it is generic, without void pointers and additional functions. This of course means that it has the downsides of macros in C. The ...
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C generic typesafe dynamic array (vector) try 2
The previous generic dynamic array I asked a review for here was written using only the preprocessor and so while the array itself was type-safe, all the manipulating macros where not.
In this try I ...
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2
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Follow-up about computing lp norm with MPI
As pointed out in the answer by Victor Eijkhout to this question, the fact I am broadcasting the same vector to each process is against the MPI principles and, most importantly, will be a bottleneck ...
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347
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Compute lp-norm of a vector in parallel with MPI
I'm trying to solve the following exercise:
Compute in parallel with MPI the lp norm of a vector of a predefined size N ...
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104
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183
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Growable vector on the stack with fixed capacity
Implements most (if not all) applicable member functions from std::vector and std::array
Compatible with C++11, C++14, C++17, C++20
[] operator allows unchecked access, all other member functions ...
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Protein Translation Learning Exercise from exercism.org
I'm learning Rust by solving exercises from different tracks on Exercism.
The below code is an implementation of "Protein Translation" from the Python track. I split ...
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2
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103
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Collect gaps in a number sequence in Rust using Vec::windows
I have the following code which collects gaps in a number sequence into a separate vec.
There will never be a case, iterating over a ...
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1
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73
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General purpose 2D grid
I am developing (WIP) a mine sweeping game to get more familiar with Rust.
I decided to represent the mine field as a 2D grid.
While developing I realized that this grid can be outsourced as a general ...
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1
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282
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Printing subarrays ⚡
I was trying to to print all subarrays of an array in quadratic time. Here is my code:
...
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1
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448
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Sort and search vectors by different criteria
Class
class Player {
std::string name;
int score;
int id;
};
I thought about how to write a code to sort and search vector ...
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Chapter 8 Challenge: Add employee names to a department
The boring but exciting challenge:
Using a HashMap and HashSet, create a text interface to allow a user to add employee names ...
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3
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1
answer
456
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Which fruit fall onto my house?
I am following a question on a programming challenge website (here's the original reference). What I have is a house (start & endpoint) and some types of trees at their respective location points. ...
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1
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C Typed Vector that implements type-safety, encapsulation and lazy initialization
C Typed Vector
I wasn't happy with the various dynamic array / vector implementations in C, so I made my own. In general, I'm not the biggest fan of C-preprocessor madness, but alas for this ...
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2
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885
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Table data structure in C++ using a vector of vectors
I'm learning C++, and now I have to implement a table data structure.
I don't know a lot about C++, so I have implemented using a vector of vectors. To access the rows of the tables I have defined ...
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Custom implementation to provide an immutable range of a vector without copying it
Edit: A new and improved version can be found in this question, based on the feedback!
I needed to pass a const reference to part of a std::vector without copy.
...
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1
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144
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Intersection of 2D vector equation straight lines
I know the vectors that describe two perpendicular lines, $$\mathbf{a} + \lambda\mathbf{d}$$ and $$\mathbf{b} + \mu\mathbf{d'}$$
I've written a JavaScript function to get the coordinates of the point ...
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RE: Find maximum value of recursively-defined "fusc" function
Continued from the previous post - a brute-force approach to calculating all the vectors from 0 to n.
I've come up with yet another solution, after I've realized that the vector takes up too much ...
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4
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Vector Implementation in C
I made a somewhat simple vector implementation in C. Right now I only have around 5 features (making a vector, adding elements, removing elements, changing elements, deleting the vector). I'm proud of ...
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2
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874
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Separating odd numbers and even numbers into two vectors in C++
I'm learning C++, and would like some guidance. I'm pretty sure I'm doing something wrong.
This algorithm runs in O(n) time and uses O(n) external space. Could I make a more efficient algorithm for ...
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5
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C++11 Custom Vector Implementation
This was my solution to an interview question:
Q: Implement an std::vector style container (does not have to be exactly compatible) with a fixed
buffer and the following requirements and restrictions:
...
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4
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1
answer
297
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Algo to return a vector of available time slots for scheduling a meeting between two persons
There are 2 persons and their already booked meeting schedule is given and also time bound for both the person is given. Now, we want to schedule a meeting between them in an available time that suits ...
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2
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182
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An implementation of Uber's “Fare Estimator”
CodeSignal put out a challenge by Uber that involves writing a "fare estimator" that involves a function dependent on cost per minute, cost per mile, ride time and ride distance.
The formula ...
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241
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627
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6
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530
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5k
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Efficiently splitting a string in C++
I've made a splitString() function which receives a character and a string and returns a vector<string> containing all the ...
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3
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2k
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Custom Vector Implementation in C++
I am relearning data structures while trying to implement them on my own while also trying to get better at C++ as although I have knowledge of C, OOP is still non-inituitive to me.
In this simple ...
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0
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650
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Finding the Euclidean distance between the vectors of matrix a, and vector b
Here is the problem,
Given a 2D numpy array 'a' of sizes n×m and a 1D numpy array 'b' of
size m. You need to find the distance(Euclidean) of the 'b' vector
from the rows of the 'a' matrix. Fill the ...
- 185
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2
answers
599
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Find neighbours of a vector
To find neighbors of a vector and return array of Vectors which are neighbors of a Vector:
...
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1
answer
812
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Inserting multiple elements at known locations in a vector
Goal
In the vector x, I would like to insert the elements of the vector values at indices stored in vector ...
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2
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471
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Compressing a vector into a specific range
I want to solve the following task --- I am given a vector of integers. I want to 'compress' this list, where the elements will be replaced with numbers 0 through <...
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4
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Given two vectors of ints, determine whether one vector is a prefix of the other
Given two vectors of ints, write a program to determine whether one vector is a prefix of the other.
For vectors of unequal length, compare the number of elements of the smaller vector.
For example, ...
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A batch_recursive_count_if Function with Unwrap Level for Various Type Arbitrary Nested Iterable Implementation in C++
This is a follow-up question for A recursive_count_if Function For Various Type Arbitrary Nested Iterable Implementation in C++ and A recursive_count_if Function with Unwrap Level for Various Type ...
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2
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1
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353
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C - Generic vector library
I'm quite new to C, and I decided to create a generic vector library. Here is the code:
...
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2
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582
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C ArrayList implementation
I have written a ArrayList class in C and I just wanted some criticism on what I can improve on. Any criticism helps, and I was wondering if there is any better way of doing error handling other than ...
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2
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541
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re-implementation of std::vector
I've implemented a simple vector-like structure. I would appreciate all criticism relevant to code.
I have also published code under github. Here is the link to source code + unit test for most ...
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3
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1k
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C++ Creating custom vector
I am new to C++ and Data structures, so I have started writing a custom vector as a practice.
Please provide critique and advice.
I know it is quite long, so thank you very much in advance. I just ...
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1
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std::vector Allocator-Aware Implementation
I've just finally finished implementing std::vector. I'm currently re-implementing whatever I can in the hope to learn more of how data structures works.
I tried to ...
0
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1
answer
72
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Find a sum using just two different digits
The problem statement was pretty easy and I was able to run half of the test cases, but some of the test cases in the end gave me the error of memory limit reached. What can I do here to improve the ...
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3
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2
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143
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Implementing dynamic array without STL
For my game engine that I'm trying to write without using STL I implemented dynamic array class(some kind of std::vector). I would like to know whether this code suits best practices. I'm also not ...
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499
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Vector Implementation C++ using RAII
I have attempted to implement a similar version of the STL Vector; several functions are missing but I'd like a few words of advice on whether I am indeed on the right track or whether I should change ...
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