regarding the discussion question, my guess is that the only cases where the answer becomes unique are those 'trivial' single-vector or equivalent cases. More precisely those cases where min(nnz(row_sums),nnz(col_sums))<=1. The reasons is that if one solution exist where x(a,b)>0 and x(c,d)>0 (and a~=c and b~=d; i.e. they are not in the same row or column), then you could simply subtract one from x(a,b) and x(c,d), and add one to x(c,b) and x(a,d), and the result will also be a valid solution... thoughts?
I confess, I found the results using intlinprog.
I would love to know how you came up with that.
Find the palindrome
Given an unsigned integer x, find the largest y by rearranging the bits in x
Angle between two vectors
Rotate input square matrix 90 degrees CCW without rot90
Recaman Sequence - I
Is It a Snake?
Crossing to Kissing - Untangle the Lines
Spot the outlier
Rotate and display numbered tile
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