-1
votes
3answers
111 views

Generate unique integer from two integers with algorithm

I am currently trying to come up with an algoritm which would take at least two numbers (say user IDs) and then come up with an unique number which is generated based on these two numbers. Each ...
3
votes
2answers
71 views

Trivially Sortable Encoding for Arbitrary-Precision Decimals

I'm looking for a reasonably(*) space-efficient way to encode arbitrary-precision decimals (e.g. BigDecimal), such that when sorting the bit-pattern of the encodings lexicographically, the numbers ...
2
votes
1answer
1k views

What is the time complexity of the algorithm to check if a number is prime?

What is the time complexity of the algorithm to check if a number is prime? This is the algorithm : bool isPrime(int number){ if(number < 2) return false; if(number == 2) return true; if(number ...
0
votes
2answers
233 views

Algorithm for picking reasonable min/max vals given a single value

I am making a simplistic in-browser IDE for some very domain-specific coding. Because I like Bret Victor's thoughts on Learnable Programming so much I thought I'd throw in some draggable numbers ala ...
2
votes
1answer
287 views

Filling array with numbers from given range so that sum of adjacent numbers is square number

Problem: Fill all the cells using distinct numbers from <1,25> set, so that sum of two adjacent cells is a square number. (source: http://grymat.im.pwr.wroc.pl/etap1/zad1etp1213.pdf; numbers 20 ...
12
votes
8answers
2k views

Find a “hole” in a list of numbers

What is the fastest way to find the first (smallest) integer that doesn't exist in a given list of unsorted integers (and that is greater than the list's smallest value)? My primitive approach is ...