gistfile1.txt

(0 to questions-1).flatMap{ i =>

    // calculate coverage of this question: we go through each vertex,
    // and see if it has been assigned to answer to this question, or
    // if a neighbour vertex (i.e. a delegate) has
    vertexList.zipWithIndex.map{case(vertex, j) =>
        if (assignments.get(j) == i) 1
        else {
            var incoming = graph.incomingEdgesOf(vertex)
            incoming.map{edge =>
                var src = edge.getPublicSrc
                assignments.get(vertexList.indexOf(src)) == i
            }.view.filter(_ == true).toSet.size
        }
    }
}.view.reduce(_ + _)/questions