/* F07CE_P0W_F C++ Header Example Program.
 *
 * Copyright 2019 Numerical Algorithms Group.
 * Mark 27, 2019.
 */

#include <nag.h>
#include <nagx04.h>
#include <nagad.h>
#include <stdio.h>
#include <string>
#include <iostream>
using namespace std;

int main(void)
{
  int       exit_status = 0;
  void      *ad_handle = 0;
  Integer   nrhs = 1, ifail = 0;

  cout << "F07CE_P0W_F C++ Header Example Program Results\n\n";
  // Skip heading in data file
  string mystr;
  getline (cin, mystr);

  // Read problem size and number of right-hand-sides 
  Integer n;
  cin >> n;
  cin >> nrhs;

  // Allocate arrays containing A and its factorized form, B
  // and the solution X.
  double  *dl=0, *d=0, *du=0, *du2=0, *x=0;
  Integer *ipiv = 0;
  Integer n1 = n-1, n2 = n-2;
  dl   = new double  [n1];
  d    = new double  [n];
  du   = new double  [n1];
  du2  = new double  [n2];
  ipiv = new Integer [n];
  x    = new double  [n*nrhs];
  
  // Read the tridiagonal matrix A and right hand side B, register and copy
  for (int i = 0; i<n1; i++) {
    cin >> du[i];
  }
  for (int i = 0; i<n; i++) {
    cin >> d[i];
  }
  for (int i = 0; i<n1; i++) {
    cin >> dl[i];
  }
  for (int i = 0; i<n; i++) {
    for (int j = 0; j<nrhs; j++) {
      int k = i + j*n;
      cin >> x[k];
    }
  }

  // Factorize the tridiagonal matrix A
  ifail = 0;
  f07cd_p0w_f_(ad_handle,n,dl,d,du,du2,ipiv,ifail);

  // Solve the equations Ax = b for x
  ifail = 0;
  f07ce_p0w_f_(ad_handle,"N",n,nrhs,dl,d,du,du2,ipiv,x,n,ifail,1);

  cout << "\n\n";
  NagError  fail;
  INIT_FAIL(fail);
  x04cac(Nag_ColMajor,Nag_GeneralMatrix,Nag_NonUnitDiag,n,nrhs,x,n,
         "  Solution",0,&fail);

  delete [] dl;
  delete [] d;
  delete [] du;
  delete [] du2;
  delete [] ipiv;
  delete [] x;
  return exit_status;
}