#include <cassert>
#include <chrono>           // timing
#include <cmath>            // sqrt()
#include <cstdlib>          // atoi()
#include <cstring>          // strncmp()
#include <ctime>
#include <iostream>
#include <sstream>
#include <vector>
#include <lapacke.h>

using namespace std;
using namespace std::chrono;  // timing

int main()
{   
    unsigned int n= 10;
    unsigned int nhrs = 1;

    vector<double> M(n*n,4.0);
   
    for(unsigned int i=0; i<n; i++)
    {
        for(unsigned int j=0; j<n; j++)
        {
            if(i!=j)
            {
                double diff = i-j;
                M[i*n+j] = 1.0/(diff*diff);
            }
        }

        
    }

    


    vector<int> ipiv(n); //pivots
    LAPACKE_dgetrf(LAPACK_ROW_MAJOR,n,n, M.data(),n,ipiv.data());  //M=PLU 


    unsigned int runtimes[] = {1,2,4,8,16,32};

    for(unsigned int i=0; i < 6;i++)
    {
        nhrs = runtimes[i];
         vector<double> b(n*nhrs,0.0);
        for (unsigned int j=0; j<n; j++)
        {
            for (unsigned int k=0; k<nhrs; k++)
            {
                b[j*nhrs+k] = j*nhrs+k;
            }
        } 
        LAPACKE_dgetrs(LAPACK_ROW_MAJOR,'N',n,nhrs,M.data(),n,ipiv.data(),b.data(),nhrs);
    }

    
    




    return 0;

    
}