#ifndef _CLUSTER_H_#define _CLUSTER_H_#include <vector>#include "DocumentVector.h"#include "Index.h"class Cluster {private:		DocumentVector centroid;	std::vector<DocumentVector> documents;	Index index;	public:	// Copy constructor	Cluster(const Cluster& c) : centroid(c.centroid), documents(c.documents), index(c.index) {} 	// Constructor that takes a DocumentVector which is the centroid	Cluster(DocumentVector centroid_, Index index_) : centroid(centroid_), index(index_) {} 		// Assignment operator	Cluster& operator = (const Cluster& c)	{		if(this != &c) 		{			centroid = c.centroid;			documents = c.documents;			index = c.index;		}				return *this;	}	DocumentVector& get_centroid() 	{		return centroid;	}		std::vector<DocumentVector>& get_documents() 	{		return documents;	}	void add_document(DocumentVector& dv) 	{		documents.insert(documents.end(), dv);	}	void update_centroid()	{		int size = documents.size();		if (size <= 1)			return;		double* sim = new double[size];		for(int i = 0; i < size; i++)		{			sim[i] = 0;			for(int j = 0; j < size; j++) 			{				index.similarity(documents[j], documents[i]);				// sim[i] += documents[j].similarity(documents[i]);			}		}				int max_index = 0;		double max_sim = 0;		for(int i = 0; i < size; i++) 		{			if(sim[i] > max_sim) 			{				max_sim = sim[i];				max_index = i;			}		}		centroid = documents[max_index];				delete[] sim;	}	double similarity(DocumentVector& dv)	{		return index.similarity(centroid, dv);		// return centroid.similarity(c.centroid);	}};#endif /* _CLUSTER_H_ */