Si vous souhaitez comme moi perdre votre temps en participant au concours de développement Tron Battle, voici un code Java qui vous permettra rapidement de développer votre robot Tron plus rapidement.
L'attribut checkerboard contient le damier avec les valeurs de chaque joueur, il ne vous reste à implémenter la méthode "Play()" avec la bonne logique pour bloquer les autres bots qui participent au concours ;-)


import java.util.Scanner;

/**
 * Tron Player
 * 
 * Author : Ludovic Toinel
 */
class Player {
          
    // Constants
    private static final String UP = "UP";
    private static final String DOWN = "DOWN";
    private static final String LEFT = "LEFT";
    private static final String RIGHT = "RIGHT";
    private static final  String[] directions = new String[]{UP,LEFT,DOWN,RIGHT};
    private static final int X = 30;
    private static final int Y = 20;
    
    // checkerboard
    public static int[][] checkerboard = new int[X][Y];
    
    // Number of players
    public static int nbPlayer;
    
    // Id of this player
    public static int idPlayer;
    
    // Current players positions
    public static Position[] players;
    
    /**
     * Play an action
     */
    private static void action(String direction){
        System.out.println(direction);
    }
    
    /**
     * Debug a message
     */
    private static void debug(String message){
         System.err.println(message);
    }

    /**
     * Main player class
     * @param args 
     */
    public static void main(String args[]) {
       
        // Init the scanner
        Scanner in = new Scanner(System.in);

        // Init coordinates
        int x0, y0, x1, y1;
 
        // Initialize the checkerBoard
        removePlayer(0);

        // Infinite while ...
        while (true) {
            
            // Count of players
            nbPlayer = in.nextInt();
            
            // Initialize players positions
            if (players == null){
                players = new Position[nbPlayer];
                for(int i = 0; i < nbPlayer; i++){
                    players[i] = new Position(0,0);
                }
            }
            
            // Retrieve my player ID
            idPlayer = in.nextInt();
    
            // For each players
            for (int player = 0; player < nbPlayer; player++){
            
                // Read the coordinates
                x0 = in.nextInt();
                y0 = in.nextInt();
                x1 = in.nextInt();
                y1 = in.nextInt();
                
                // Player has lost
                if (x0 == -1){
                    removePlayer(player);
                    continue;
                }
                
                // Update the checkerboard
                checkerboard[x1][y1] = player;
                
                // Save the current player position
                players[player].update(x1,y1);
            }

            // Play the round
            play();
            
        }
    }

    
    /** 
     * Remove the player from the checkerboard
     */
    private static void removePlayer(int id){
        for(int i=0; i<checkerboard.length;i++){
            for (int e = 0; e < checkerboard[i].length;e++){
                if (checkerboard[i][e]  ==  id ) {
                	checkerboard[i][e] = -1;
                }
            }
        }
    }
 
    /**
     * Play a round 
     */
    public static void play(){

        // TODO CODE HERE ! 

        action(LEFT);
       
    }
    
    /**
     * Position class
     */
    public static class Position{
        public int x;
        public int y;
        public boolean me;
        
        /** Constructor */
         public Position(int x, int y){
             this.x = x;
             this.y = y;
         }
         
         /** Update the position */
         public void update(int x, int y){
             this.x = x;
             this.y = y;
         }
         
     	/* (non-Javadoc)
     	 * @see java.lang.Object#equals(java.lang.Object)
     	 */
     	public boolean equals(Position obj) {
     		return (obj != null && obj.x == x && obj.y == y);
     	}
    }
 }

Dépêchez-vous, il ne vous reste plus que 32 jours avant la fin du concours.