Number of 1s or 0s from a boolean array

How to find the number of 1s or 0s from a boolean array. e.g. in 101011, there are four 1s and two 0s.
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ABBPAK ha scritto:
Hi,
When you talk about the value change, how to predefine the first value and the last value. e.g. 1100011. here just twice a time value changes but there are four 1s and three 0s.
thanks
Did you focus on the word "sort"? 
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