1. This solution is much faster on re-invocation than the one without the persistent num_ones variable. Unless of course it is performed on a much larger (than num_ones) array of 32-bit integer.
2. It is essential to have the statement
The reason for this is that the floor() function has a problem with precision. If can fail with 32-bit integer that are close to 2^32.
For instance, consider this Matlab code and system response:
The Goldbach Conjecture
Make a simplified barcode
Compute the dilation of a binary image
Dimensions of a rectangle
Knots Contest: Score (TestSuite)
PACMAT 09 - Awesome Tunnelling Ghosts, Equal Speed, 20 Lives, Game Download
Criss-Cross Verification: NHL
PACMAT - G03 Ghosts use minimum path to PACMAT; 3 Lives
GJam 2011 Africa Qualifier C: House, maximum area rectangle
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