// kolo.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "mpi.h"
#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

int main()
{

	int size;
	int rank;
	MPI_Init(NULL, NULL);
	MPI_Comm_size(MPI_COMM_WORLD,&size);
	MPI_Comm_rank(MPI_COMM_WORLD,&rank);

	int* tab;
	int nRank;
	int Iloczyn=1;

	if(rank==0)
	{
		cout<<"Podaj nRank:"<<endl;
		cin>>nRank;
		int n=size*nRank;
		tab=new int[n];
		srand(time(NULL));
		for(int i=0;i<n;i++)
		{
			tab[i]=rand()%10;
		}
	}
	//rozeslanie rozmiaru;
	MPI_Bcast(&nRank,1,MPI_INT,0,MPI_COMM_WORLD);

	//dzielenie tab;
	int* tabRank=new int[nRank];
	MPI_Scatter(tab,nRank,MPI_INT,tabRank,nRank,MPI_INT,0,MPI_COMM_WORLD);

	//liczenie iloczynu
	int nIloczyn=1;
	for(int i=0;i<nRank;i++)
	{
		nIloczyn=nIloczyn*tabRank[i];
	}
	cout<<rank<<" iloczyn: "<<nIloczyn<<endl;

	//zliczanie iloczynu
	MPI_Reduce(&nIloczyn,&Iloczyn,1,MPI_INT,MPI_PROD,0,MPI_COMM_WORLD);

	if(rank==0)
	{
		cout<<"Iloczyn calosci: "<<Iloczyn<<endl;
	}
	delete[] tab;
	MPI_Finalize();

	system("PAUSE");

    return 0;
}