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:
Filter AC, pass DC
Longest run of consecutive numbers
Construct an index vector from two input vectors in vectorized fashion
Change a specific color in an image
What's Your BMI?
GJam 2013 Veterans: Ocean View (Large)
GJam 2011 Africa Qualifier C: House, maximum area rectangle
Sudoku Solver - Standard 9x9
Remove NaNs and numbers adjacent to NaNs
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