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
Return the 'Size' of a String of Code
System of equations
Split a string into chunks of specified length
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
GJam March 2016 IOW: Clock Dance
GJam 2017 Kickstart: Vote (Large)
Prime Sequences: AP-k Minimum Final Value
GJam 2013 Veterans: Hedge
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