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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 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 javax.imageio.*;
import java.math.*;
class main {
static int[] matrixToIntArray(Matrix m) {
int w = m.getWidth(), h = m.getHeight(), n = w*h;
int[] a = new int[n];
int i = 0;
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
a[i++] = m.get(x, y);
return a;
}
interface Matrix {
public int getWidth();
public int getHeight();
public A get(int x, int y);
public void set(int x, int y, A a);
}
}