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Everett Rubel submitted Solution 143978 to Problem 10. Determine whether a vector is monotonically increasing

on 15 Jan 2013

Everett Rubel submitted Solution 143977 to Problem 10. Determine whether a vector is monotonically increasing

on 15 Jan 2013

Everett Rubel submitted Solution 154866 to Problem 38. Return a list sorted by number of occurrences

on 27 Oct 2012

Everett Rubel submitted a Comment to Problem 986. Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration

Jean-Marie: The transformation between steps 2 and 3 (1 0 0 -> 1 1 0) is the same as for the one between steps 8 and 9; we are working with the entire stack of 3 coins. The first/top coin exchanges with the last/bottom coin and then all coins change their orientation.

on 25 Oct 2012

Everett Rubel submitted Solution 152646 to Problem 73. Replace NaNs with the number that appears to its left in the row.

on 21 Oct 2012

Everett Rubel submitted Solution 152204 to Problem 470. Scoring for oriented dominoes

on 20 Oct 2012

Everett Rubel submitted a Comment to Problem 986. Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration

Jean-Marie: I think the phrase, "invert the substack" is the issue. For me, this means to take the substack and invert it as a unit. The coins exchange positions in the substack as well as inverting their values. It is a single physical action that translates into two separate operations on the coins. I may have done better to write, "flip the substack as a unit."

on 18 Oct 2012

Everett Rubel submitted Solution 149190 to Problem 15. Find the longest sequence of 1's in a binary sequence.

on 16 Oct 2012

Everett Rubel submitted Solution 148631 to Problem 157. The Hitchhiker's Guide to MATLAB

on 15 Oct 2012

Everett Rubel received Commenter badge for Problem 42. Find the alphabetic word product

on 14 Oct 2012

Everett Rubel submitted a Comment to Problem 42. Find the alphabetic word product

For the bonus question, we can rule out any number that has a prime factor greater than 26 (z). The product found by Jason Friedman is the first number greater than 10^6 that does not have such a prime factor. The product 999856 is the largest number less than 10^6 to be part of a possible solution.

on 14 Oct 2012

Everett Rubel submitted Solution 148166 to Problem 42. Find the alphabetic word product

on 14 Oct 2012

Everett Rubel submitted Solution 147740 to Problem 189. Sum all integers from 1 to 2^n

on 12 Oct 2012

Everett Rubel submitted Solution 147022 to Problem 64. The Goldbach Conjecture, Part 2

on 11 Oct 2012

Everett Rubel received Creator badge for Problem 986. Penny Flipping: Reverse subsets of a sequence of coins until you recover the original configuration

on 10 Oct 2012

Everett Rubel submitted Solution 144765 to Problem 39. Which values occur exactly three times?

on 5 Oct 2012