#include "RecoPixelVertexing/PixelTriplets/interface/QuadrupletSeedMerger.h"
#include "RecoPixelVertexing/PixelTriplets/plugins/KDTreeLinkerAlgo.h"
#include "RecoPixelVertexing/PixelTriplets/plugins/KDTreeLinkerTools.h"
#include "DataFormats/TrackerCommon/interface/TrackerTopology.h"
#include "DataFormats/GeometryVector/interface/Pi.h"
#include <algorithm>