Bitcoin Forum

// (c) 2013 Come-from-Beyond

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashSet;

public final class Tri {
	
	public static void main(String[] args) {
		
		while (true) {
			
			System.out.println("Time = " + System.currentTimeMillis());
			
			try {
				
				Thread.sleep(120000);
				
			} catch (final Exception e) {
				
				return;
				
			}
			
			try {
				
				final ArrayList<Bet> bets = new ArrayList<>();
				final HashSet<String> payments = new HashSet<>();
				
				String block = "2680262203532249785"; // This is the genesis block id
				
				while (true) {
					
					String blockData = sendRequest("getBlock&block=" + block);
					
					int i = blockData.indexOf("\"transactions\":[");
					String transactions = blockData.substring(i + 16, blockData.indexOf("]", i));
					while (transactions.length() > 0) {
						
						final String transaction = transactions.substring(1, transactions.indexOf("\"", 1));
						final String transactionData = sendRequest("getTransaction&transaction=" + transaction);
						
						// Beginning of the game logic
						i = transactionData.indexOf("\"sender\":\"");
						final String sender = transactionData.substring(i + 10, transactionData.indexOf("\"", i + 10));
						i = transactionData.indexOf("\"recipient\":\"");
						final String recipient = transactionData.substring(i + 13, transactionData.indexOf("\"", i + 13));
						
						if (recipient.equals("4427320429393039971")) {
							
							i = transactionData.indexOf("\"amount\":");
							final int amount = Integer.parseInt(transactionData.substring(i + 9, transactionData.indexOf(",", i + 9)));
							
							if (amount >= 10 && amount <= 1000) {
								
								bets.add(new Bet(block, transaction, amount, sender));
								
							}
							
						} else if (sender.equals("3994117300242888518")) {
							
							i = transactionData.indexOf("\"referencedTransaction\":\"");
							final String referencedTransaction = transactionData.substring(i + 25, transactionData.indexOf("\"", i + 25));
							payments.add(referencedTransaction);
							
						}
						// End of the game logic
						
						if (transaction.length() + 3 > transactions.length()) {
							
							break;
							
						}
						transactions = transactions.substring(transaction.length() + 3);
						
					}
					
					i = blockData.indexOf("\"nextBlock\":\"");
					if (i < 0) {
						
						break;
						
					}
					block = blockData.substring(i + 13, blockData.indexOf("\"", i + 13));
					
				}
				
				// Beginning of the game logic
				for (final Bet bet : bets) {
					
					if (!payments.contains(bet.transaction)) {
						
						final String request = "sendMoney&secretPhrase=REMOVED&recipient=" + bet.sender + "&amount=" + getAmount(bet) + "&fee=1&deadline=1&referencedTransaction=" + bet.transaction;
						System.out.println(request);
						System.out.println(sendRequest(request));
						
					}
					
				}
				// End of the game logic
				
			} catch (final Exception e) {
				
				System.out.println(e.toString());
				
			}
			
		}
		
	}
	
	public static int getAmount(final Bet bet) {
		
		final String digits = bet.block.substring(bet.block.length() - 3);
		final int digit0 = Integer.parseInt("" + digits.charAt(0));
		final int digit1 = Integer.parseInt("" + digits.charAt(1));
		final int digit2 = Integer.parseInt("" + digits.charAt(2));
		
		if (digit0 == digit1 && digit0 == digit2) {
			
			return bet.amount * 10;
			
		}
		
		if (digit0 == digit1 || digit0 == digit2 || digit1 == digit2) {
			
			return bet.amount * 3;
			
		}
		
		return 1;
		
	}
	
	public static String sendRequest(final String request) throws Exception {
		
		final HttpURLConnection connection = (HttpURLConnection)(new URL("http://localhost:7876/?request=" + request)).openConnection();
		final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		final String response = reader.readLine();
		reader.close();
		connection.disconnect();
		
		return response;
		
	}
	
	public static final class Bet {
		
		final String block;
		final String transaction;
		final int amount;
		final String sender;
		
		public Bet(final String block, final String transaction, final int amount, final String sender) {
			
			this.block = block;
			this.transaction = transaction;
			this.amount = amount;
			this.sender = sender;
			
		}
		
	}
	
}