user avatar
user avatar
user avatar
john mangual
  • Member for 9 years, 8 months
  • Last seen this week
58 votes
8 answers
30k views

Is Morse code without spaces uniquely decipherable?

38 votes
6 answers
7k views

What use are groups, monoids, and rings in database computations?

9 votes
3 answers
3k views

Random sampling in a polygon

8 votes
1 answer
805 views

How is IO a monad?

6 votes
2 answers
538 views

integer factoring using Fermat's method

6 votes
1 answer
2k views

circle packing algorithm used by Percolator

6 votes
2 answers
327 views

Can we prove that $1 + 2 + \dots + n = \frac{n(n+1)}{2}$ using a computer program?

5 votes
2 answers
6k views

why not just use a random number generator as a hash function?

4 votes
3 answers
403 views

counting arithmetic progressions $a, a+r, a+2r$ in a list

3 votes
2 answers
74 views

How do learn the most important nodes in a tree?

3 votes
4 answers
2k views

Listing integers as the sum of three squares $m = x^2 + y^2 + z^2$

3 votes
2 answers
1k views

what is the name for the space between the leaves of a tree

2 votes
2 answers
734 views

How to decompose a unit cube into tetrahedra?

2 votes
1 answer
47 views

Generating all words of length $n$ avoiding $A^2$ and $B^3$

2 votes
1 answer
79 views

Can this Arrow-Ring puzzle be encoded as an integer programming problem?

2 votes
2 answers
3k views

Algorithm for implementing the modulus "%" operator?

2 votes
1 answer
550 views

Can we prove mathematical induction statements in Lisp?

2 votes
2 answers
754 views

Find the duplicates in a list of floating point numbers

2 votes
1 answer
371 views

connected components - determining "groups" in Go

1 vote
0 answers
24 views

Finding all "smooth" numbers up to 10^6 -- problem with nested loops [duplicate]

1 vote
1 answer
3k views

Regular expression for words in a language where each letter appears at least once

1 vote
2 answers
296 views

choice of data structure for domino tilings

1 vote
2 answers
516 views

criterion for two line segments intersecting

1 vote
0 answers
347 views

Can the Sieve of Eratosthenes be adapted to find twin primes

1 vote
1 answer
874 views

iterating over subsets by switching one element at a time

1 vote
0 answers
873 views

Longest Increasing Subsequence

1 vote
1 answer
1k views

Facebook Hackercup 2013: Balanced Smileys