# Questions tagged [programming-challenge]

Programming challenges are off-site challenges meant to offer programmers educational experiences while testing their abilities.

126 questions with no upvoted or accepted answers
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### 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 ...
544 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 ...
166 views

### Search and Replace (FreeCodeCamp intermediate algorithm scripting)

I completed the challenge and passed the tests: Perform a search and replace on the sentence using the arguments provided and return the new sentence. First argument is the sentence to perform ...
588 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 ...
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 ...
135 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 ...
45 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 ...
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, ...
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 ...
283 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. ...
217 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 ...
115 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 ...
78 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 ...
79 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)!, ...
61 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 "...
274 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 ...
87 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 ...
100 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 ...
511 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 ...
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 ...
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 ...
82 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, ...
123 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). ...
402 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 ...
129 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 ...
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 ...
563 views

### Hackerearth Simple Function - Follow-up

Problem statement Let us first describe a SimpleFunction: ...
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 ...
329 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 ...
143 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 ...
66 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, ...
92 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 ...
68 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 ...
18 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 ...
62 views

Code Problem ...
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### 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 ...
113 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 ...
69 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 ...
40 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 ...
90 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....
152 views

### Rosalind - Finding a Shared Motif

Here is my attempt to implement the Ukkonen algorithm for the Finding a Shared Motif problem on rosalind.info. The code works, it produces a correct answer. It does so in 11 seconds. I am hoping to ...
546 views

### (Leetcode) Longest consecutive sequence in Python

This is a Leetcode problem - Given an unsorted array of integers, find the length of the longest consecutive elements' sequence. Your algorithm should run in $O(n)$ complexity. ...
95 views

### Bursting Balloons

This is a Leetcode problem - Given n balloons, indexed from 0 to n-1. Each balloon is ...
128 views

### Frog Jump time complexity

I have tried to work out the Frog Jump task on Codility. The algorithm for solving this is rather simple but the maximum score I am able to achieve is 55% (also 44% with modulus operations). A ...
70 views

### Coding Challenge Solution - Find Number of Elements in a range in $O(1)$ with preprocessing

Overview This is my solution to the following Coding Challenge - Find Num of Elements in a Range in $O(1)$ with Preprocessing - Given an array and max element in the array, find the number of ...
90 views

### Daily coding problem 18: Maximums of k-sized windows

The challenge Given an array of integers and a number k, where 1 <= k <= length of the array, compute the maximum values of each subarray of length k. For example, given array = [10, 5, 2, 7, ...
123 views

### Determine whether there exists a one-to-one character mapping from one string to another

The task Determine whether there exists a one-to-one character mapping from one string s1 to another s2. For example, given s1 = abc and s2 = bcd, return true since we can map a to b, b to ...
63 views

### Code Chef's Cleaning Tables: find the minimum number of tables to clean

Description: Haku has been newly hired by Chef to clean tables at his restaurant. So whenever a customer wants a table, Haku must clean it. But Haku happens to be a lazy boy. So in the ...