How to calculate "holes" in timetable

Posted by genesiss on Stack Overflow See other posts from Stack Overflow or by genesiss
Published on 2010-06-08T09:48:05Z Indexed on 2010/06/08 10:12 UTC
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homework

I've got a 2-dimensional array like this (it represents a timetable):

http://www.shrani.si/f/28/L6/37YvFye/timetable.png

Orange cells are lectures and whites are free time. How could I calculate number of free hours between lectures in the same day? (columns are days and rows are hours)

For example, in this table the result should be:
2 for first column
0 for second colum
--> The function returns 2 (because 2+0=2)

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