Questions tagged [programming-challenge]
Programming challenges are off-site challenges meant to offer programmers educational experiences while testing their abilities.
146
questions with no upvoted or accepted answers
6
votes
0answers
556 views
Advent Of Code 2018 Day 15 - Naive Rust program
I solved the Advent of Code problems last year in Python, and I wanted to learn a new language this year, so I decided to write up Part 1 of on of the hardest problems from last year - problem 15 - in ...
6
votes
0answers
399 views
Kattis problem Amanda Lounges
I wrote this solution to Kattis problem Amanda Lounges in Scala. TL;DR: It's a graph theory problem where I read in a list of edges from stdin and try to compute the minimum number of nodes that ...
5
votes
0answers
69 views
LeetCode 37: Sudoku Solver
I'm posting my code for a LeetCode problem. If you'd like to review, please do so. Thank you for your time!
Problem
Write a program to solve a Sudoku puzzle by filling the empty cells.
A sudoku ...
5
votes
0answers
47 views
LeetCode 284: Peeking Iterator
I'm posting my code for a LeetCode problem. If you'd like to review, please do so. Thank you for your time!
Problem
Given an Iterator class interface with methods: ...
5
votes
0answers
210 views
Palindrome insertion challenge
Here is my solution to the following Daily Coding Problem challenge
Given a string, find the palindrome that can be made by inserting the
fewest number of characters as possible anywhere in the ...
5
votes
0answers
669 views
Codewars: N-dimensional Von Neumann Neighborhood in a matrix
Task:
For creating this challenge on Codewars I need a very performant function that calculates Von Neumann Neighborhood in a N-dimensional array. This function will be called about 2000 times
The ...
4
votes
0answers
68 views
Extracting cycles from directed graph with max degree 1 and then performing set cover on cycles
I'm trying to solve P1243E in an efficient manner. The problem in simple words is:
Given \$k\$ boxes, \$i\$-th box with \$n_i\$ numbers. All numbers are distinct. We need to select one number from ...
4
votes
0answers
67 views
Two solutions to leetcode 127.wordLadder
I am working on Word Ladder - LeetCode
Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWord, such ...
4
votes
0answers
1k views
Design an object oriented parking lot
I solved this system design interview question.
The problem description
Design a parking lot
Constraints and assumptions
What types of vehicles should we support?
Motorcycle, ...
4
votes
0answers
45 views
Texplode KotH controller
I am creating a KotH (King of the Hill) challenge for Programming Puzzles and Code Golf. Other site users will write programs that play Texplode (a version of this game on a square grid). The program ...
4
votes
0answers
284 views
Advent Of Code 2016 Day 9 Part 1 Solution
This code gives the solution to Part 1 of this question:
http://adventofcode.com/2016/day/9
Summary: You have to find the length of the input string after using the markers to duplicate parts of it. ...
4
votes
0answers
300 views
Time Limit Exceeded with shortest path algorithm
The problem:
SHPATH
You are given a list of cities. Each direct connection between two
cities has its transportation cost (an integer bigger than 0). The
goal is to find the paths of minimum cost ...
4
votes
0answers
118 views
Project Euler #14 in Clojure (finding long Collatz sequence chain)
I'm working on a Clojure implementation for Project Euler #14, which asks for the initial element, under 106, that produces the longest collatz-sequence chain. I'm trying to make use of every ...
3
votes
0answers
58 views
Count unique subsequences
I came across this question in a coding competition (Java-restricted) and I got a time-length-exceeded. I am unable to provide a link as the contest is closed now. Can I know how can I optimise this?
...
3
votes
0answers
82 views
Longest palindrome code in C# takes time out on LeetCode
I like to request a review of the code below, which is my attempt at answering the question here on LeetCode site. The code passes 43 tests, but it times out on the next one. I copied and ran the test ...
3
votes
1answer
110 views
Project Euler # 53 Combinatoric selections in Python
There are exactly ten ways of selecting three from five, 12345:
123, 124, 125, 134, 135, 145, 234, 235, 245, and 345
In combinatorics, we use the notation, 5C3=10.
In general, nCr = n! / r! (n−r)!, ...
3
votes
0answers
96 views
Find the starting indices of all occurrences of the pattern in the string - KMP algorithm follow-up
The task
was initially solved here, but was too buggy:
Given a string and a pattern, find the starting indices of all
occurrences of the pattern in the string. For example, given the
string "...
3
votes
0answers
364 views
Kadane's algorithms to leetcode “121 Best Time to Buy and Sell Stock”
I employed the conventional Kadane's algorithms to solve a maximum subarray problem in leetcode Best Time to Buy and Sell Stock - LeetCode
Description
Best Time to Buy and Sell Stock
...
3
votes
0answers
89 views
Writing Go object code that respects Go guidelines
I'm learning Go and I wrote this for a programming challenge. It is working (building and running) but I feel the code is not what Go code should be:
Am I using the ...
3
votes
0answers
2k views
Deepest pit of an array
Following is based on a problem description from a Codility test, as a task in an interview.
DeepestPit - problem description
A non-empty zero-indexed array B ...
3
votes
0answers
106 views
Kattis Ants challenge
I am trying to learn Haskell doing some contest problems. I have worked a bit with the language but still have a very long way ahead.
Right now I am working with a problem called Ants:
An army of ...
3
votes
0answers
584 views
Given an input string and a pattern, implement wildcard pattern matching
I have been trying to solve "Wildcard Matching" on leetcode. I know there are more "manual" ways to solve this without using the RE library. But I would like to know if passing the time limit is ...
3
votes
0answers
77 views
Solutions for counting trapped water on islands
There are some exercises about islands and water. I have seen other solutions in Java, but they are developed in procedural style in one-two methods. I tried to develop an object-oriented solution ...
3
votes
0answers
100 views
Advent of Code 2017 Day 3 (part 1) in Functional Programming (FP)
I wanted to practice functional programming (FP) without using any library but using vanilla JS only. So I took a problem from Advent of Code.
https://adventofcode.com/2017/day/3
You come across ...
3
votes
0answers
85 views
SPOJ Fast Matching challenge
I wrote a solution to the MATCHING challenge on SPOJ:
FJ has N (1 ≤ N ≤ 50,000) cows and M (1 ≤ M ≤ 50,000) bulls. Given a list of P (1 ≤ P ≤ 150,000) potential matches between a cow and a bull, ...
3
votes
0answers
336 views
Python2.7 Some xor fun
After doing the Cryptopals challanges, which I found scrolling through codereview, and finally being able to solve set1 challenge 6. I decided to have a little xor fun, and make an automated xor ...
3
votes
0answers
135 views
Codingame: Great Escape bot in Ruby - Follow-up
This is a follow-up to Codingame: Great Escape bot in Ruby.
As mentioned there, my first reasonably sized Ruby project is a bot for CodinGame's Great Escape contest (here is a sample gameplay video).
...
3
votes
0answers
484 views
Hackerrank: Sherlock and anagram (optimal time complexity)
Problem statement
Given a string \$S\$, find the number of "unordered anagrammatic pairs" of substrings.
Input Format
First line contains \$T\$, the number of testcases. Each testcase ...
3
votes
0answers
136 views
Finding the maximal bottleneck in a 2D matrix from source to destination
I recently started solving programming challenges and this one is causing me performance trouble. The problem statement is the following:
You are given a 2d matrix where each cell contains an ...
3
votes
0answers
1k views
Hackerrank: Sherlock and anagram
Problem statement
Given a string \$S\$, find the number of "unordered anagrammatic pairs" of substrings.
Input Format
First line contains \$T\$, the number of testcases. Each testcase ...
3
votes
0answers
578 views
Hackerearth Simple Function - Follow-up
Problem statement
Let us first describe a SimpleFunction:
...
3
votes
0answers
1k views
Solving the Mining algorithm from HackerRank
I was working on this problem for a few hours last night and finally came up with a brute-force solution. The task is to report the minimum work necessary (sum of weight × distance) to relocate gold ...
3
votes
0answers
340 views
CodeEval - Lucky Tickets challenge
This a solution to the CodeEval's challenge "Lucky Tickets".
After a failed attempt with brute-force calculations (no surprise here), I have tried to implement an algorithm that I found on ...
3
votes
0answers
151 views
ACM-ICPC HackerRank challenge in C++
I was doing a programming question in C++ at HackerRank. Given a set of up to 500 bitstrings, each up to 500 bits long, the task is to find the pair a and b such that the bitwise OR contains the most ...
3
votes
0answers
69 views
Optimizing a problem that test all permutations of 1 array with other fixed array
I'm trying to solve this question on a contest programming judge.
Description of the problem:
There are N birds in a forest, each in their respective tree. There are N tired crows in this forest, ...
3
votes
0answers
95 views
Project Euler #2 in Go
I just learned Go (yesterday in fact) and today I made this solution to Project Euler #2. The problem is to sum the even Fibonacci numbers. My program uses the matrix representation of the linear ...
2
votes
0answers
22 views
Benchmarking multiple implementations of a Code Kata: queue for the self-checkout tills at the supermarket
I was reading this question:
Why is my function timing out when run with a larger data set?
And although I couldn't quite grasp the OP's implementation and so didn't feel like answering.
I did some ...
2
votes
0answers
53 views
Performance challenge: Box operations (HackerRank) (C, Python)
Recently I've been doing some challenges on HackerRank and came across this one. First, I tried with Python, and then C. Both of my codes failed due to timeout restrictions.
It would be very helpful, ...
2
votes
0answers
57 views
LeetCode 200: Number of Islands
I'm posting my code for a LeetCode problem. If you'd like to review, please do so. Thank you for your time!
Problem
Given a 2d grid map of '1's (land) and '0's (water), count the number
of islands. ...
2
votes
0answers
27 views
Lispy code? Palindrome of product
My answer to Project Euler problem 4 (largest palindrome of product of two 3-digit numbers) is below.
Please suggest improvements, style changes, indentation, commenting, naming, ...
And nitpicks are ...
2
votes
0answers
37 views
Finding number of brackets sequences of length n containing a specific string s
I am trying to solve a problem where I need to find the number of bracket sequences \$p\$ and \$q\$ such that for a given bracket sequence s. I have that \$p + s + q\$ is a valid bracket sequence. ...
2
votes
0answers
36 views
Project Euler #14: Longest Collatz sequence on HackerRank
The following is the conclusion in a long chain of attempts to solve Project Euler problem #14 (Longest Collatz sequence) on HackerRank in the Haskell programming language.
The problem is defined as ...
2
votes
0answers
32 views
Project Euler Problem 54 poker hands in OCaml
I've been refactoring my OCaml solution for Project Euler problem 54, which is about comparing poker hands.
While I'm mostly satisfied with my second iteration of the refactor, I stumbled upon two ...
2
votes
0answers
99 views
Given an integer array A and a range, find a subarray within the range with a minimum sum
Problem
HackerRank Range query:
You are given an array A of n integers. You have to perform ...
2
votes
0answers
30 views
Codewars: Remote Control Virtual Keyboard
This is my solution to the Codewars problem TV Remote (symbols).
Description
In short, you are given a virtual keyboard with 3 modes between which can be switched by pressing the ...
2
votes
0answers
363 views
Favorite Genres
I was doing Favorite Genres code from leetcode
Question Link: https://leetcode.com/discuss/interview-question/373006
Question: Given a map Map> userSongs with user names as keys and a list of ...
2
votes
0answers
120 views
Split a string into valid words
I am trying to solve this LeetCode question:
Given a non-empty string s and a dictionary wordDict containing a list
of non-empty words, add spaces in s to construct a sentence where each
word ...
2
votes
0answers
76 views
LeetCode: House Robber II C#
https://leetcode.com/problems/house-robber-ii/
You are a professional robber planning to rob houses along a street.
Each house has a certain amount of money stashed. All houses at this
place ...
2
votes
0answers
46 views
Leetcode Finding Maximum Area of Island Solution
Given a non-empty 2D array grid of 0's and 1's, an island is a group
of 1's (representing land) connected 4-directionally (horizontal or
vertical.) You may assume all four edges of the grid are ...
2
votes
0answers
182 views
Solution to 3Sum problem on Leetcode using HashTable
The problem of 3sum is described as:
Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero....
