source code

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Collections;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class StickXorVis {

private static final int minL = 1;
private static final int maxL = 25;

private int N = 60;
private int K = 500;
private int[] L;

private SecureRandom rnd;

private int[][] A;

private long seed;
private int score;

private void generate(String seedStr) {
try {
rnd = SecureRandom.getInstance("SHA1PRNG");
seed = Long.parseLong(seedStr);
rnd.setSeed(seed);

L = new int[K];
for (int i = 0; i < L.length; i++) {
L[i] = rnd.nextInt(maxL - minL + 1) + minL;
}

A = new int[N][N];
for (int r = 0; r < N; r++) {
for (int c = 0; c < N; c++) {
A[r][c] = rnd.nextDouble() < 0.5 ? 0 : 1;
}
}

} catch (Exception e) {
addFatalError("An exception occurred while generating test case.");
e.printStackTrace();
}
}

public double runTest(String seed) {
try {
generate(seed);

if (proc == null) {
return -1;
}

int[][] stickXor;
try {
stickXor = getSolution(N, K, L, A);
} catch (Exception e) {
addFatalError("Failed to get result from getSolution.");
return -1.0;
}

for (int i = 0; i < stickXor.length; i++) {
for (int j = 0; j < stickXor[i].length; j++) {
if (stickXor[i][j] < 0 || stickXor[i][j] >= N) {
addFatalError("You can only make stickXor inside the area.");
return -1.0;
}
}
if (!(stickXor[i][0] == stickXor[i][2] || stickXor[i][1] == stickXor[i][3])) {
addFatalError("stickXor is invalid shape.");
return -1.0;
}
}

int score0 = calculateScore();

score = calculateScore() - score0;

drawer = null;
if (vis) {
drawer = new Drawer();
}

ArrayList<Pair<Integer, Integer>> pairs = new ArrayList<>();
for (int k = 0; k < K; k++) {
pairs.add(new Pair<Integer, Integer>(L[k], k));
}
Collections.sort(pairs);

for (int k = 0; k < K; k++) {
int i = pairs.get(k).second.intValue();
flip(stickXor[i][0], stickXor[i][1], stickXor[i][2], stickXor[i][3]);

if (vis) {

score = calculateScore() - score0;

numSticks = k + 1;

drawer.repaint();
try {
Thread.sleep(100);
} catch (Exception e) {
}
}
}

score = calculateScore() - score0;

return score;

} catch (Exception e) {
addFatalError("An exception occurred while trying to get your program's results.");
e.printStackTrace();
return -1.0;
}
}

private int calculateScore() {
int score = 0;
for (int r = 0; r < N; r++) {
for (int c = 0; c < N; c++) {
if (A[r][c] == 0) {
score++;
}
}
}
return score;
}

private void flip(int startR, int startC, int endR, int endC) {
for (int r = startR; r <= endR; r++) {
for (int c = startC; c <= endC; c++) {
A[r][c] ^= 1;
}
}
}

private static String exec;
private static boolean vis, debug;
private static Process proc;
private InputStream is;
private OutputStream os;
private BufferedReader br;

private int[][] getSolution(int N, int K, int[] L, int[][] A) throws IOException {
StringBuffer sb = new StringBuffer();
sb.append(N).append(" ").append(K).append("\n");
for (int i = 0; i < L.length; ++i) {
sb.append(L[i]).append(" ");
}
sb.append("\n");
for (int i = 0; i < A.length; ++i) {
for (int j = 0; j < A[i].length; ++j) {
sb.append(A[i][j]);
}
sb.append("\n");
}
os.write(sb.toString().getBytes());
os.flush();

int[][] ret = new int[K][4];
for (int i = 0; i < K; i++) {
String[] split = br.readLine().split(" ");
for (int j = 0; j < 4; j++) {
ret[i][j] = Integer.parseInt(split[j]) - 1;
}
}
return ret;
}

public StickXorVis(String seed) {
try {
if (exec != null) {
try {
Runtime rt = Runtime.getRuntime();
proc = rt.exec(exec);
os = proc.getOutputStream();
is = proc.getInputStream();
br = new BufferedReader(new InputStreamReader(is));
new ErrorReader(proc.getErrorStream()).start();
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("Score = " + runTest(seed));
stopSolution();
} catch (Exception e) {
e.printStackTrace();
}
}

private void stopSolution() {
if (proc != null) {
try {
proc.destroy();
} catch (Exception e) {
e.printStackTrace();
}
}
}

private Drawer drawer;
private int numSticks;

class Drawer extends JFrame {
public static final int EXTRA_WIDTH = 300;
public static final int EXTRA_HEIGHT = 30;

public DrawerPanel panel;

public int cellSize, boardSize;
public int width, height;

class DrawerPanel extends JPanel {

public void paint(Graphics g) {

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) bi.getGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

g2.setColor(Color.LIGHT_GRAY);
g2.fillRect(0, 0, width, height);

for (int r = 0; r < N; r++) {
for (int c = 0; c < N; c++) {
if (A[r][c] == 0) {
g2.setColor(Color.WHITE);
} else {
g2.setColor(Color.BLACK);
}
g2.fillRect(15 + cellSize * c, 15 + cellSize * r, cellSize, cellSize);
}
}

g2.setColor(Color.BLUE);
for (int i = 0; i <= boardSize; i++) {
g2.drawLine(15 + i * cellSize, 15, 15 + i * cellSize, 15 + cellSize * boardSize);
g2.drawLine(15, 15 + i * cellSize, 15 + cellSize * boardSize, 15 + i * cellSize);
}

g2.setColor(Color.BLACK);
g2.setFont(new Font("Arial", Font.BOLD, 12));

int x = 40 + boardSize * cellSize;
int y = 30;

g2.drawString("Seed : " + seed, x, y += 15);
g2.drawString("numRectangles : " + (numSticks + "/" + 500), x, y += 15);
g2.drawString("Score : " + score, x, y += 15);

g.drawImage(bi, 0, 0, width, height, null);
}
}

class DrawerWindowListener extends WindowAdapter {
public void windowClosing(WindowEvent event) {
stopSolution();
System.exit(0);
}
}

public Drawer() {
super();

panel = new DrawerPanel();
getContentPane().add(panel);

addWindowListener(new DrawerWindowListener());

boardSize = N;
this.cellSize = 8;
width = cellSize * boardSize + EXTRA_WIDTH;
height = cellSize * boardSize + EXTRA_HEIGHT;
setSize(width, height);

setTitle("Visualizer tool for problem Stick Xor");

setResizable(false);
setVisible(true);
}
}

public static void main(String[] args) {
String seed = "1";
vis = true;
for (int i = 0; i < args.length; i++) {
if (args[i].equals("-seed"))
seed = args[++i];
if (args[i].equals("-exec"))
exec = args[++i];
if (args[i].equals("-novis"))
vis = false;
if (args[i].equals("-debug"))
debug = true;
}
new StickXorVis(seed);
}

void addFatalError(String message) {
System.out.println(message);
}
}

class ErrorReader extends Thread {
BufferedReader error;

public ErrorReader(InputStream is) {
error = new BufferedReader(new InputStreamReader(is));
}

public void run() {
try {
for (String s; (s = error.readLine()) != null;) {
System.err.println(s);
System.err.flush();
}
} catch (Exception e) {
e.getStackTrace();
}
}
}

class Pair<T extends Comparable<T>, S> implements Comparable<Pair<T, S>> {
public T first;
public S second;

public Pair(T t, S s) {
this.first = t;
this.second = s;
}

private int hash = 0;

@Override
public int hashCode() {
if (hash == 0) {
final int prime = 31;
int result = 1;
result = prime * result + ((first == null) ? 0 : first.hashCode());
result = prime * result + ((second == null) ? 0 : second.hashCode());
hash = result;
}
return hash;
}

@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Pair<T, S> other = (Pair<T, S>) obj;
if (first == null) {
if (other.first != null)
return false;
} else if (!first.equals(other.first))
return false;
if (second == null) {
if (other.second != null)
return false;
} else if (!second.equals(other.second))
return false;
return true;
}

@Override
public int compareTo(Pair<T, S> o) {
return first.compareTo(o.first);
}
}