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Questions tagged [complexity]

Complexity is the analysis of how the time and space requirements of an algorithm vary according to the size of the input. Use this tag for reviews where the "Big O" is a concern.

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Finding highly correlated variables in a dataframe by evaluating its correlation matrix's values

I read data from Excel into a Pandas DataFrame, so that every column represents a different variable, and every row represents a different sample. I made the function below to identify potential ...
Pimsel's user avatar
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2 votes
2 answers
85 views

For two sequences N and M, display counts of elements n from N below each m from M up to the first n above m

A school's task: There are two sequences n_tab and m_tab. For every element m in m_tab ...
Szyszka947's user avatar
1 vote
0 answers
20 views

Designing a font definition with multiple variants per glyph

My project penhand tries to visualize the process of writing with a pen. Part of the project is an engine that converts text entry into a sequence of glyphs that are then rendered as animation into a ...
ccprog's user avatar
  • 151
3 votes
1 answer
210 views

Find pairs that concatenate to a given value

I was doing a CodeSignal coding assessment and run into the following problem: You are given an array of positive integers, and a positive integer x. Your task is to find the number of ways that x can ...
João Gabriel's user avatar
2 votes
1 answer
137 views

Pre-calculate attacks in a chess game

I'm writing (or at least trying to write) a chess engine in C++. This is the first time I write code in C++, and I use this project to practice. Anyway, I'm following the general guidelines of a ...
BarAmber's user avatar
  • 105
1 vote
1 answer
377 views

Assignment function for Intervals container

I found the two related questions but they, however, do not answer my question: interval map implementation Where exactly does my code not adhere to the specification of the key and value type? The ...
asm's user avatar
  • 111
6 votes
1 answer
141 views

Doubly linked list first fit free list malloc/free in Python

As an exercise I've implemented malloc and free in Python as a first fit free list as described here. This tracks which blocks are free in a doubly linked list that is sorted by the address of the ...
Xander Dunn's user avatar
2 votes
1 answer
56 views

Merge Sort with Minimum Sufficient Variables, Verbosity and better Space Complexity

The majority of merge sort implementations searched online are provided with unnecessary variables and code lines. Here is an attempt to reduce that. However, does passing back the subArray as return ...
Thomas Mathew's user avatar
0 votes
0 answers
114 views

Program to generate a tree of permutations

There is a computation I'm doing with permutations (permutations of varying length of an entire interval [1,N] for some N) in python that I feel could be faster. ...
Matt Samuel's user avatar
0 votes
2 answers
277 views

Binary Search written in python with O(n) [closed]

def search(nums, target): for i in range(len(nums)): if nums[i] == target: return i if nums[i] == None: return -1 I think ...
111's user avatar
  • 45
-2 votes
1 answer
187 views

Number Plate Generation Program

I wrote a number plate generation program. The program generates number plates for a car registered with a specific Memory Tag and on a specific date. Number plates use the following format: (2 letter ...
kmvfkmfv's user avatar
1 vote
0 answers
64 views

Traveling salesman (Dynamic Approach) retrieve path without losing on time complexity

It is difficult to find resources on above programming problem therefore I've decided to ask a question on this forum. Using memoization and dynamic programming we can obtain a code that gives \$O(2^N ...
Kacper's user avatar
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3 votes
2 answers
229 views

Add two numbers represented as digit strings

This algorithm adds two numbers digit by digit using their string representations. I am wondering what the time and space complexities of the following algorithm are. In particular, I am wondering ...
MadPhysicist's user avatar
1 vote
1 answer
132 views

Leetcode 55. Jump Game solution

I was working on Jump Game problem on leetcode Question You are given an integer array nums. You are initially positioned at the array's first index, and each element in the array represents your ...
D_S_X's user avatar
  • 189
1 vote
1 answer
253 views

Printing subarrays ⚡

I was trying to to print all subarrays of an array in quadratic time. Here is my code: ...
Vaibhav Vishal Singh's user avatar
0 votes
0 answers
51 views

Calculate maximum value of expression for potential associations

I have an algorithm that calculates the maximum value of an expression that is made from numbers and * or + by adding parentheses. It has 3 nested loops, so the time complexity should be N^3 ...
Tomas's user avatar
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0 votes
2 answers
343 views

Algorithm for twoSum

This is my PHP algorithm for the twoSum problem in leetCode: ...
Chubby Cows's user avatar
0 votes
1 answer
73 views

Time complexity of several methods of reversing a domain name string

Note: I'm aware of this existing post which is similar. However, it does not address all my questions sufficiently. I have the following three functions, all of which do the same thing: reverse a ...
Richard Robinson's user avatar
3 votes
1 answer
344 views

Finding the minimum element of a stack of numbers

As part of an online programming challenge, I wrote a program that implements a stack of integers, supporting adding and removing elements, finding the last inserted element, and the minimum element. ...
gparyani's user avatar
  • 131
1 vote
2 answers
271 views

group countries by language in JavaScript

I need a better implementation than the below code (O(N) Solution), I am grouping countries by language ( data ) is the countries JSON, each country could have 0, 1 .. or more language as the object ...
Odeh Abuzaid's user avatar
0 votes
2 answers
729 views

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 ...
Asher I's user avatar
  • 13
4 votes
1 answer
150 views

Brute force to solve refund amount in a payment/invoice domain

I work at a major Swedish insurance company. I'm in charge of a service that matches bank payments with invoices. I will not show the details of that match logic. But one outcome of the match is that ...
Anders's user avatar
  • 670
-2 votes
2 answers
103 views

Getting items that have more than one entry in the array with optimized code

...
PDHide's user avatar
  • 123
2 votes
2 answers
239 views

Find the highest product of three numbers in a list (Python)

I wrote the below as a solution to: Problem Find the highest product of three numbers in a list Constraints Is the input a list of integers? Yes Can we get negative inputs? Yes Can there be ...
msm1089's user avatar
  • 187
1 vote
2 answers
265 views

SumList Cracking the coding Interview

Sum of 2 numbers, represented with linked lists, where digits are in backward order or forward order. Backward order Example INPUT:(7->1->6) + (5->9->2) = 617+295 OUTPUT: 2->1->9 = ...
Uomolepre's user avatar
0 votes
2 answers
200 views

Optimizing methods with multiple if checks on getter values

I have a method where I fetch user input, check if certain values exist, and based on that build my own custom input object that I would use to search in a database. The code for the search method is ...
AnOldSoul's user avatar
  • 121
3 votes
1 answer
200 views

Find the largest decrease in a sequence of numbers

I have written a function that takes as input a list of 5 numbers, then the program's goal is to return the largest drop in the list. It is important to understand that [5, 3, ...] is a decrease of 2 ...
yungCalculator's user avatar
0 votes
3 answers
182 views

Finding unique top sums from multiple lists

My question arises from this post on MSE where I have provided an answer to solve the question : There are multiple lists given. The number of lists is arbitrary. Each list contains numbers and is ...
Tortar's user avatar
  • 101
1 vote
2 answers
850 views

URLify a given String - replace spaces with %20

I have written a code to replace all spaces in a String with %20. ...
salazarin's user avatar
  • 113
2 votes
2 answers
330 views

Can I further optimize this solution for HackerRank's “Making Candies”?

My C++ solution for HackerRank's "Making Candies" problem, reproduced below, is as optimized as I can make it and appears similar to what others say are optimal solutions. However, six of ...
Ray Hamel's user avatar
  • 258
3 votes
1 answer
111 views

Substring search in Java

I am trying to make an algorithm that will find the index of a given substring (which I have labeled pattern) in a given String (...
qwerty's user avatar
  • 361
2 votes
2 answers
123 views

Optimize nested loops for counting the total number of selections

The question is: To select 2 numbers out of n positive integer inputs (order matters), where the number that is placed anywhere before the second must be greater than the second by a given number m. ...
Curious student's user avatar
2 votes
0 answers
104 views

Monotonic stack - complexity analysis

I tried following the official solution of LC975 (https://leetcode.com/problems/odd-even-jump/), using a monotonic stack - i.e., I reimplemented their solution (Approach 1) from python in C++. TLDR ...
Mircea's user avatar
  • 300
3 votes
4 answers
162 views

Is this an efficient/correct way to get largest Prime factor?

Is this an efficient way to get the largest prime factor of a given number? Other solutions I found involved nested algorithms. ...
Tharindu's user avatar
  • 133
3 votes
1 answer
331 views

strstr implementation with python and sets

Please review my strstr implementation in terms of time/space efficiency and overall readability. I am preparing for a coding assessment coming up as I am looking to pivot my career from Physics to ...
Gonzo's user avatar
  • 31
1 vote
0 answers
78 views

Sorting Algorithm using Modified Merge sort

I've been messing around with merge sort. Instead of doing a recursive division of the array I chose to keep keep track of the middle index of every three numbers. Using the index of the middle number,...
EL_H4CK0's user avatar
4 votes
2 answers
4k views

Merge arrays in objects in array based on property

I have the following code which takes an array that might have duplicate ids and will merge the items of those duplicate, and ...
callback's user avatar
  • 189
4 votes
1 answer
501 views

Performant Sort function for big arrays

In sort(arr), I want to sort an array. Children must be beneath their parent. And children of the same parent are sorted using ...
Helix112's user avatar
  • 143
2 votes
2 answers
718 views

LeetCode 3Sum Java Solution

I have this Java solution to LeetCode's 3Sum problem. I would be really grateful if I could get feedback on correctness, scalability, efficiency, coding best practices, and OOP design. I'm relatively ...
StackMatch's user avatar
2 votes
0 answers
173 views

2D Array Word Search: Complexity and Optimization

🧩 Objective Determine whether a given word is contained in a 2D Array word search. 🔎 Question 1. What are the time and space complexities of the current algorithm? Time complexity Linear: \$O(2(r * ...
AdamHurwitz's user avatar
0 votes
1 answer
256 views

Generate unique string permutations recursively

🧩 Objective Write a recursive method for generating all permutations of an input string. Return them as a set. See: Recursive String Permutations - Interview Cake 🔎 Questions 1: How does the ...
AdamHurwitz's user avatar
1 vote
1 answer
495 views

Most efficient solution for USACO: Cow Gymnastics - Python

I was trying to figure out this problem, and I did. However, my code is so abhorrently ugly that I want to tear out my eyeballs when I look at it: ...
12 rhombi in grid w no corners's user avatar
3 votes
2 answers
119 views

Cyclomatic Complexity (complexity)

I have a program for finding shortest distance/path and I got a correct answer but I am getting an issue i.e., "Function 'shortestPath' has a complexity of 9. Maximum allowed is 6." This is ...
L.Nyamagoud's user avatar
3 votes
1 answer
269 views

Ensuring if an object is Assignable from a class type

I am trying to ensure type in the below method. How to reduce its cognitive complexity to below 15 from the current 27? It looks more readable as it is? Is there a way to break this down to make it ...
Sourabh's user avatar
  • 33
5 votes
1 answer
464 views

01 Matrix is too slow when solved using DFS

I tried solving Leetcode 01 Matrix problem. It is running too slow when solved using DFS approach. Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance ...
Akanksha's user avatar
  • 129
3 votes
2 answers
788 views

Most Efficient Solution for USACO: Triangles - Python

I'm trying to solve this problem with Python 3.8. In my code, I used 3 nested for loops to check every single point and storing the largest area with each set of points. This program works fine, but ...
12 rhombi in grid w no corners's user avatar
7 votes
2 answers
674 views

Best Algorithm for solving USACO: Photoshoot - Python

I was trying to solve this problem with Python 3.8. I couldn't find a way other than to brute-force calculate all the possible permutations then check which permutation was valid. The program works ...
12 rhombi in grid w no corners's user avatar
-4 votes
1 answer
61 views

What is the time complexity problem I need to manage on a Hackerank "Ransom Note" - my code runs perfectly [closed]

I am trying to solve the "Ransom Note" problem on hackerank. Why isn't my code getting submitted? What can I do differently? is my total time complexity, in this case, it is O(n^2)? ...
Kar19's user avatar
  • 159
2 votes
2 answers
2k views

Dynamic Array Based Stack in C

I wrote a dynamic stack in C that uses an array as a structure. I tried to maintain O(1) for push and pop and believe I have done so. I want to know what can be written in a cleaner way and if there ...
guitarcat's user avatar
  • 123
3 votes
1 answer
56 views

Count number of square integers in a given range of ints (faster function?)

The function below passes most test cases: ...
kennsorr's user avatar
  • 213

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