Questions tagged [programming-challenge]
Use this tag when the code is a solution to a programming challenge. Always include a sufficient description of the problem to be solved - while a link to the challenge is welcome, the review request needs to be complete when the challenge site is unavailable.
3,225
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LeetCode: Remove Duplicate Letters [closed]
I'm trying to solve this question: https://leetcode.com/problems/remove-duplicate-letters/description/?envType=daily-question&envId=2023-09-26
which is
Given a string s, remove duplicate letters ...
- 11
2
votes
1
answer
73
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Project Euler Problem 1: Multiples of 3 or 5
The following is my solution to Project Euler Problem 1: Multiples of 3 or 5.
...
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3
votes
3
answers
168
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Increment a large integer represented as array of digits
This problem can be found at LeetCode. Since I was studying idiomatic or 'pythonic' code in my language today, I decided to take the most 'pythonic' approach and challenged myself to do this in one ...
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3
votes
1
answer
57
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Autocomplete system with prefix tree
I am quite new to Haskell, and this problem is from dailycodingproblem.com:
Implement an autocomplete system.
That is, given a query string s and a set of all ...
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4
votes
3
answers
726
views
Codewars: Multiplying Polynomials
I'm trying to solve the following Kata from Codewars in Python.
My code produces the desired result for all the tests, yet it is not optimal, so it takes too much time to accomplish the big tests.
<...
3
votes
1
answer
306
views
Python function to find the count of digits of numerals in base n up to a given limit
This is a simple exercise to find the count of digits of all numerals in a given base up to a given limit (not including the limit), I wrote it to determine the ratio of bytes saved when the numbers ...
- 2,954
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1
answer
96
views
4
votes
4
answers
797
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Lottery Analysis (Python Crash Course, exercise 9-15)
I was working on Python Crash Course, exercise 9-15: 'Lottery Analysis'. It took me a very long time to get it to work. The reason it took that long is I wanted to use my existing class from the ...
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1
vote
1
answer
101
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Calculate the cost of Biryani lessons
Problem:
According to a recent survey, Biryani is the most ordered food. Chef
wants to learn how to make world-class Biryani from a MasterChef. The
chef will be required to attend the MasterChef's ...
- 113
0
votes
1
answer
122
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Python Logic Gate Circuit Simulator [closed]
I have recently become interested in simulating logic circuits because of a electronics class at school. I have created a functioning simulator for logic gate circuits in Python. My implementation ...
- 13
0
votes
3
answers
118
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Efficient Solution for Finding Product of Largest Pair in Array
Hello fellow developers,
I have written a function called max_product that aims to find the product of the largest two integers in a unique array of positive ...
- 397
1
vote
0
answers
44
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LeetCode 399 Evaluate Division using Scala
In order to gain familiarity with Scala I am trying to solve the following problem
https://leetcode.com/problems/evaluate-division/description/
You are given an array of variable pairs equations and ...
- 111
1
vote
1
answer
105
views
Determine the chance a streak of 6 HEADs or 6 TAILS appear in 100 flips, repeated 10000 times [closed]
Here's the problem from the book Automate the boring stuff:
write a program to find out how often a streak of six heads or a streak of six tails comes up in a randomly generated list of heads and ...
- 113
5
votes
2
answers
128
views
Generating Pascal's Triangle in C99
I recently completed the Pascal's Triangle challenge on leetcode. I would like to have my code reviewed.
You don't need a leetcode account to see the description of the challenge linked above, but for ...
- 1,053
4
votes
1
answer
97
views
Find the longest palindromic subsequence - Using a hashmap in Rust
This is a leetcode question which I wanted to solve using Rust as I'm learning Rust at the moment. I would appreciate some feedback on how to write it idiomatically.
Link to the question: https://...
- 297
2
votes
3
answers
461
views
Recursive palindrome check
I'm trying to solve this which basically calls for a recursive palindrome check with some minor extra steps (Special characters and whitespace can be ignored). The test inputs' length can be 100000 ...
- 125
1
vote
2
answers
330
views
Split the Bill and calculate the Tip
I have created a Bill Splitter page that asks for the total bill amount, tip percentage, and the number of people. Then it displays the tip and the total amount (including the tip) each person has to ...
- 113
3
votes
3
answers
111
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Solution to Codejam 2021 1C (Closest Pick) in C
The following code is my solution to the Closest Pick problem from Codejam 2021.
You are entering a raffle for a lifetime supply of pancakes. N tickets have already been sold. Each ticket contains a ...
- 287
1
vote
1
answer
92
views
Count islands in a binary grid
This is the No of Island code challenge.
Please review my implementation in Haskell. I know there must be some better way of doing this.
Given an m x n 2D binary grid grid which represents a map of '...
- 249
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votes
1
answer
104
views
Using JavaScript to interface with REST APIs
The website TryHackMe came up with a challenge that involves using HTTP requests to interface with REST APIs (here, task #14/day 9). The challenge basically involves querying a basic REST API to ...
- 153
3
votes
1
answer
234
views
Validating a Sudoku Board in Python
The problem statement is as follows:
Sudoku is a game played on a 9x9 grid. The goal of the game is to fill
all cells of the grid with digits from 1 to 9, so that each column,
each row, and each of ...
- 33
4
votes
3
answers
132
views
Improving efficiency of Rust algorithm ported from Python generator
I'm learning Rust by solving ProjectEuler problems.
To this end, I am trying to port a solution to problem 88 (link) in Python that heavily relies on generators to Rust (which doesn't have generators)....
- 93
2
votes
2
answers
150
views
Generate the number of partitions of each integer
I've coded a program that calculates the number of partitions of n into at least two distinct parts, and is relatively quick too (about N^1.5 complexity). For input 30 000 it takes roughly 4 seconds. ...
- 21
3
votes
0
answers
140
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Advent of Code 2021 Day 19
I am taking advantage of the recent layoffs to teach myself Kotlin. I am a career Java programmer, I've touched Kotlin before but not actively, and not for a few years. I wrote it all in one file ...
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4
votes
3
answers
136
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Simple photomosaic generator
I wrote an implementation of Robert Heaton's Programming Exercise for Advanced Beginners #4 (photomosaics) in C99 using the MagickCore library. The full code is as follows:
...
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0
answers
59
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Modified PoC for BlogEngine.NET CMS (CVE-2019-6714)
This is a modified exploit proof of concept targeting the BlogEngine.NET content management system (CVE-2019-6714) for the .NET framework. I modified it (from Cobb 2019) to execute payloads via ...
- 153
0
votes
1
answer
934
views
sum of intervals kata in codewars
instructions for the kata:
Write a function called sumIntervals/sum_intervals() that accepts an array of intervals, and returns the sum of all the interval lengths. Overlapping intervals should only ...
- 47
0
votes
1
answer
143
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Permutations CodeWars problem solved!
i have solved a question in codewars:
https://www.codewars.com/kata/5254ca2719453dcc0b00027d/python
, here's my solution is it unefficient to use itertools because people are blaming that is cheating ...
- 139
0
votes
1
answer
240
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Calculate score of rock-paper-scissors (Advent of Code 2022: Day 2)
Advent of code, Day 2.
Here is my code.
Less verbose version of the question follows.
...
- 505
1
vote
2
answers
158
views
Implementation of aho corasick algorithm - slow suffix construction
EDIT: Dequeu was the correct guess
EDIT: I did the BFS method for the suffix link/output link construction
I'm doing a hackerrank challenge and I came up with this implementation of the aho corasick ...
5
votes
1
answer
79
views
Möbius function using iterators for prime factors
While working on Project Euler, I have come across a few questions involving usage of the little omega function, big omega function, and Möbius function.
My prior code wrote factors into an array and ...
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3
votes
1
answer
44
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Generate total property sold for given postcode
I had to implement the below as a coding challenge.
There are two http endpoints. The first http endpoints returns a list of postcodes. The second http endpoint takes a postcode as a parameter and ...
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2
votes
1
answer
170
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Finger Exercise: Update book cipher by creating new book
I'm working my way through the finger exercises in John Guttag's book Introduction to Python Programming, third edition. The following finger exercise on page 143 describes encryption/decryption with ...
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6
votes
2
answers
871
views
Find all combinations of length 3 whose sum is divisible by a given number
I came up with a suitable solution to a HackerRank problem that failed because the execution took longer than 10 seconds on lists that were of very large size.
The problem: Given a list ...
3
votes
1
answer
90
views
Number to Roman in Rust
I solved LC12 (Integer to Roman) in Rust.
I am a beginner with Rust, so I translated my previous solution from C++ to Rust.
I am looking for feedback on how I could improve the following Rust code.
...
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4
votes
1
answer
265
views
Leetcode, longest palindromic substring
Here's a link
Given a string s, return the longest palindromic substring in s. A string is called a palindrome string if the reverse of that string is the same as the original string.
Example 1:
...
1
vote
2
answers
360
views
Find the cheapest flight to reach from source to destination
As the input you get the flight schedule as an array, each element of which is the price of a direct flight between 2 cities ...
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1
vote
1
answer
238
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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 ...
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6
votes
1
answer
447
views
HackerEarth challenge: Lunch boxes
I was solving the lunch boxes problem on HackerEarth but as I submitted my solution most of the test cases were passed and the rest showed 'Time Limit Exceeded'. I would be very grateful if you could ...
3
votes
3
answers
826
views
Creating Phone Number challenge from Code Wars
I solved a question on Codewars about creating a phone number:
Write a function that accepts an array of 10 integers (between 0 and 9), that returns a string of those numbers in the form of a phone ...
- 139
2
votes
1
answer
131
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LeetCode#494 target sum (dart is slower than python)
I'm trying to solve a LeetCode problem target-sum, in two languages: Python & Dart. The difference of time taken is shocking for me"
Python took ~70ms while Dart took ~900ms !! Why does Dart ...
2
votes
1
answer
137
views
An evolutionary algorithm written in Java to crack an XOR cipher
Alright. So TryHackme is a website that tries to teach hacking with hands on labs. They have a room called JVM Reverse Engineering where the user gets to reverse engineer Java apps, and in particular ...
- 153
5
votes
1
answer
286
views
Connecting ropes with minimum cost
Question:
There are given N ropes of different lengths, we need to connect these ropes into one rope. The cost to connect two ropes is equal to sum of their lengths. The task is to connect the ropes ...
3
votes
0
answers
97
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Finding the number of possible paths in a cave system (Python)
I've finally come up with working solution for day 12 of AdventOfCode, where you have to find the number of possible paths in a cave system following a given set of rules (described below). My ...
5
votes
2
answers
975
views
Find the best couple of an array in 1.5 seconds
I faced this exercise.
Given a sequence \$S\$ (\$2 <= |S| <= 10^6\$) of numbers (\$1 <= S_x <= 10^7\$), determine \$max(abs(S_i - S_j) + abs(i -j))\$.
Here is the solution I found:
...
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2
votes
0
answers
700
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Determining the winning bingo from a set of bingo boards and sequence of draws
I've learned Python basics about two years ago and did a few personal projects, one big one that turned out to be useful in my line of work, a few small programs for my hobbies and I've also began ...
3
votes
2
answers
289
views
-1
votes
1
answer
65
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Sum of differences between products and LCMs
I've been trying to solve this Codewars problem https://www.codewars.com/kata/56e56756404bb1c950000992
In this kata you need to create a function that takes a 2D array/list of non-negative integer ...
- 41
5
votes
2
answers
453
views
Leet Code 139 (Word Break) using a trie with recursion
I was attempting to solve LeetCode 139 - Word Break
Given a string s and a dictionary of strings wordDict, return
...
- 253
2
votes
1
answer
54
views
Small typesafe assertion library, is()
I need to write a function with the following requirements (Programming TypeScript book by B. Cherny, Chapter 4, exercise 5):
Implement a small typesafe assertion library, ...
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