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:
Remove any row in which a NaN appears
Find common elements in matrix rows
Increment a number, given its digits
Multiply 2 numbers
Angles of the hands of a clock
Graceful Double Wheel Graph
TRON Tourney 000 : Clockwise Wall Hugger
Magic - Faro Shuffle
PACMAT 05 - Optimized Ghosts, PACMAT increasing speed, 12 Lives
Binpack Contest: Retro
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