Stream compaction consists of removing undesired elements in a collection depending on a predicate. For example, considering an array of integers and the predicate p(x)=x>5, the array A={6,3,2,11,4,5,3,7,5,77,94,0} is compacted to B={6,11,7,77,94}. The general idea of stream compaction approaches is that a different computational thread be assigned to a different element of the array to be compacted. Each of such threads must decide to write its corresponding element to the output array de...