import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import java.util.function.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.imageio.*;
import java.math.*;
import java.time.Duration;
import org.ejml.data.*;
import org.ejml.dense.row.*;
import org.ejml.dense.row.decomposition.eig.*;

class main {


 // ejml-core
 // ejml-ddense





static double[][] invertMatrix(double[][] matrixData) {
  var matrix = new DMatrixRMaj(matrixData);
  if (!CommonOps_DDRM.invert(matrix))
    return null; // unable to invert matrix
  return ejmlMatrixToArray(matrix);
}
static double[][] ejmlMatrixToArray(DMatrixRMaj matrix) {
  int w = matrix.getNumCols(), h = matrix.getNumRows();
  double[][] array = new double[h][w];

  for (int y = 0; y < h; y++)
    for (int x = 0; x < w; x++)
      array[y][x] = matrix.get(y, x);
  
  return array;
}



}