Programming Puzzle Solutions: JS, Java, Python, Go
This is the index for the four programming puzzle problems on this site. Each one has language-specific solutions in JavaScript, Java, Python, or Go — …
Read Article →Coding-Challenges
14 articles about coding-challenges development, tools, and best practices
Longest Alphabetical Substring (JS)
The challenge
Find the longest substring of a string where characters appear in non-decreasing alphabetical order. If two substrings share the maximum …
Read Article →Longest Alphabetical Substring in Java
The challenge
Find the longest substring of a string where characters are in non-decreasing alphabetical order. If multiple substrings share the …
Read Article →Longest Vowel Substring in JS
The challenge
Given a lowercase string of letters (no spaces, no digits), return the length of the longest substring made only of vowels (aeiou). …
Longest Vowel Substring in Python
The challenge
Given a lowercase string of letters (no spaces, no digits), return the length of the longest substring that contains only vowels (aeiou …
Permutations Alphabetically in JS
The challenge
Given a lowercase word, return every permutation of its letters in alphabetical order. Do not use built-in permutation libraries. …
Read Article →Permutations Alphabetically (Java)
The challenge
Given a word (a string of lowercase letters), return all its permutations in alphabetical order. Do not use built-in permutation …
Read Article →Find Number With Most Digits in Go
The challenge
Given a slice of positive integers, return the value with the most digits. If two or more values share the highest digit count, return …
Read Article →Find Number With Most Digits in Java
The challenge
Given an array of positive integers, return the number with the most digits. If two or more numbers share the highest digit count, …
Read Article →Find Number With Most Digits in JS
The challenge
Given an array of positive integers, return the number with the most digits. If two numbers have the same number of digits, return the …
Read Article →Longest Alphabetical Substring (Python)
The challenge
Find the longest substring in alphabetical order. If there are multiple substrings of the same maximum length, return the one that …
Read Article →Find the Number With Most Digits (Python)
The challenge
Find the number with the most digits in a list of positive integers. If two numbers have the same number of digits, return the first one …
Read Article →Python String Permutations (No itertools)
The quick way: using itertools
Python’s itertools.permutations handles this in one line:
from itertools import permutations
perms = sorted([ …Find the Longest Vowel Substring in Java
The challenge
The vowel substrings in the word codewarriors are o, e, a, io. The longest of these has a length of 2.
Given a lowercase string that has …
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