私のエントリー。
それほど特別なことは何もありませんでした。自分が持っている優れたアイデアをすべて追加する時間もありませんでした。
しかし、それはかなりうまくいくようです。競争でどのように機能するかを見てみましょう。
（これをファイルに入れMissouri.csてプロジェクトに追加します。）
using System;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Collections.Generic;
using System.Linq;
using System.Diagnostics;
namespace Battleship
{
// The Empire of Japan surrendered on the deck of the USS Missouri on Sept. 2, 1945
public class USSMissouri : IBattleshipOpponent
{
public String Name { get { return name; } }
public Version Version { get { return ver; } }
#region IBattleship Interface
// IBattleship::NewGame
public void NewGame(Size gameSize, TimeSpan timeSpan)
{
size = gameSize;
shotBoard = new ShotBoard(size);
attackVector = new Stack<Attack>();
}
// IBattleship::PlaceShips
public void PlaceShips(ReadOnlyCollection<Ship> ships)
{
HunterBoard board;
targetBoards = new List<HunterBoard>();
shotBoard = new ShotBoard(size);
foreach (Ship s in ships)
{
board = new HunterBoard(this, size, s);
targetBoards.Add(board);
// REWRITE: to ensure valid board placement.
s.Place(
new Point(
rand.Next(size.Width),
rand.Next(size.Height)),
(ShipOrientation)rand.Next(2));
}
}
// IBattleship::GetShot
public Point GetShot()
{
Point p = new Point();
if (attackVector.Count() > 0)
{
p = ExtendShot();
return p;
}
// Contemplate a shot at every-single point, and measure how effective it would be.
Board potential = new Board(size);
for(p.Y=0; p.Y<size.Height; ++p.Y)
{
for(p.X=0; p.X<size.Width; ++p.X)
{
if (shotBoard.ShotAt(p))
{
potential[p] = 0;
continue;
}
foreach(HunterBoard b in targetBoards)
{
potential[p] += b.GetWeightAt(p);
}
}
}
// Okay, we have the shot potential of the board.
// Lets pick a weighted-random spot.
Point shot;
shot = potential.GetWeightedRandom(rand.NextDouble());
shotBoard[shot] = Shot.Unresolved;
return shot;
}
public Point ExtendShot()
{
// Lets consider North, South, East, and West of the current shot.
// and measure the potential of each
Attack attack = attackVector.Peek();
Board potential = new Board(size);
Point[] points = attack.GetNextTargets();
foreach(Point p in points)
{
if (shotBoard.ShotAt(p))
{
potential[p] = 0;
continue;
}
foreach(HunterBoard b in targetBoards)
{
potential[p] += b.GetWeightAt(p);
}
}
Point shot = potential.GetBestShot();
shotBoard[shot] = Shot.Unresolved;
return shot;
}
// IBattleship::NewMatch
public void NewMatch(string opponent)
{
}
public void OpponentShot(Point shot)
{
}
public void ShotHit(Point shot, bool sunk)
{
shotBoard[shot] = Shot.Hit;
if (!sunk)
{
if (attackVector.Count == 0) // This is a first hit, open an attackVector
{
attackVector.Push(new Attack(this, shot));
}
else
{
attackVector.Peek().AddHit(shot); // Add a hit to our current attack.
}
}
// What if it is sunk? Close the top attack, which we've been pursuing.
if (sunk)
{
if (attackVector.Count > 0)
{
attackVector.Pop();
}
}
}
public void ShotMiss(Point shot)
{
shotBoard[shot] = Shot.Miss;
foreach(HunterBoard b in targetBoards)
{
b.ShotMiss(shot); // Update the potential map.
}
}
public void GameWon()
{
Trace.WriteLine ("I won the game!");
}
public void GameLost()
{
Trace.WriteLine ("I lost the game!");
}
public void MatchOver()
{
Trace.WriteLine("This match is over.");
}
#endregion
public ShotBoard theShotBoard
{
get { return shotBoard; }
}
public Size theBoardSize
{
get { return size; }
}
private Random rand = new Random();
private Version ver = new Version(6, 3); // USS Missouri is BB-63, hence version 6.3
private String name = "USS Missouri (abelenky@alum.mit.edu)";
private Size size;
private List<HunterBoard> targetBoards;
private ShotBoard shotBoard;
private Stack<Attack> attackVector;
}
// An Attack is the data on the ship we are currently working on sinking.
// It consists of a set of points, horizontal and vertical, from a central point.
// And can be extended in any direction.
public class Attack
{
public Attack(USSMissouri root, Point p)
{
Player = root;
hit = p;
horzExtent = new Extent(p.X, p.X);
vertExtent = new Extent(p.Y, p.Y);
}
public Extent HorizontalExtent
{
get { return horzExtent; }
}
public Extent VerticalExtent
{
get { return vertExtent; }
}
public Point FirstHit
{
get { return hit; }
}
public void AddHit(Point p)
{
if (hit.X == p.X) // New hit in the vertical direction
{
vertExtent.Min = Math.Min(vertExtent.Min, p.Y);
vertExtent.Max = Math.Max(vertExtent.Max, p.Y);
}
else if (hit.Y == p.Y)
{
horzExtent.Min = Math.Min(horzExtent.Min, p.X);
horzExtent.Max = Math.Max(horzExtent.Max, p.X);
}
}
public Point[] GetNextTargets()
{
List<Point> bors = new List<Point>();
Point p;
p = new Point(hit.X, vertExtent.Min-1);
while (p.Y >= 0 && Player.theShotBoard[p] == Shot.Hit)
{
if (Player.theShotBoard[p] == Shot.Miss)
{
break; // Don't add p to the List 'bors.
}
--p.Y;
}
if (p.Y >= 0 && Player.theShotBoard[p] == Shot.None) // Add next-target only if there is no shot here yet.
{
bors.Add(p);
}
//-------------------
p = new Point(hit.X, vertExtent.Max+1);
while (p.Y < Player.theBoardSize.Height && Player.theShotBoard[p] == Shot.Hit)
{
if (Player.theShotBoard[p] == Shot.Miss)
{
break; // Don't add p to the List 'bors.
}
++p.Y;
}
if (p.Y < Player.theBoardSize.Height && Player.theShotBoard[p] == Shot.None)
{
bors.Add(p);
}
//-------------------
p = new Point(horzExtent.Min-1, hit.Y);
while (p.X >= 0 && Player.theShotBoard[p] == Shot.Hit)
{
if (Player.theShotBoard[p] == Shot.Miss)
{
break; // Don't add p to the List 'bors.
}
--p.X;
}
if (p.X >= 0 && Player.theShotBoard[p] == Shot.None)
{
bors.Add(p);
}
//-------------------
p = new Point(horzExtent.Max+1, hit.Y);
while (p.X < Player.theBoardSize.Width && Player.theShotBoard[p] == Shot.Hit)
{
if (Player.theShotBoard[p] == Shot.Miss)
{
break; // Don't add p to the List 'bors.
}
++p.X;
}
if (p.X < Player.theBoardSize.Width && Player.theShotBoard[p] == Shot.None)
{
bors.Add(p);
}
return bors.ToArray();
}
private Point hit;
private Extent horzExtent;
private Extent vertExtent;
private USSMissouri Player;
}
public struct Extent
{
public Extent(Int32 min, Int32 max)
{
Min = min;
Max = max;
}
public Int32 Min;
public Int32 Max;
}
public class Board // The potential-Board, which measures the full potential of each square.
{
// A Board is the status of many things.
public Board(Size boardsize)
{
size = boardsize;
grid = new int[size.Width , size.Height];
Array.Clear(grid,0,size.Width*size.Height);
}
public int this[int c,int r]
{
get { return grid[c,r]; }
set { grid[c,r] = value; }
}
public int this[Point p]
{
get { return grid[p.X, p.Y]; }
set { grid[p.X, p.Y] = value; }
}
public Point GetWeightedRandom(double r)
{
Int32 sum = 0;
foreach(Int32 i in grid)
{
sum += i;
}
Int32 index = (Int32)(r*sum);
Int32 x=0, y=0;
for(y=0; y<size.Height; ++y)
{
for(x=0; x<size.Width; ++x)
{
if (grid[x,y] == 0) continue; // Skip any zero-cells
index -= grid[x,y];
if (index < 0) break;
}
if (index < 0) break;
}
if (x == 10 || y == 10)
throw new Exception("WTF");
return new Point(x,y);
}
public Point GetBestShot()
{
int max=grid[0,0];
for(int y=0; y<size.Height; ++y)
{
for (int x=0; x<size.Width; ++x)
{
max = (grid[x,y] > max)? grid[x,y] : max;
}
}
for(int y=0; y<size.Height; ++y)
{
for (int x=0; x<size.Width; ++x)
{
if (grid[x,y] == max)
{
return new Point(x,y);
}
}
}
return new Point(0,0);
}
public bool IsZero()
{
foreach(Int32 p in grid)
{
if (p > 0)
{
return false;
}
}
return true;
}
public override String ToString()
{
String output = "";
String horzDiv = " +----+----+----+----+----+----+----+----+----+----+\n";
String disp;
int x,y;
output += " A B C D E F G H I J \n" + horzDiv;
for(y=0; y<size.Height; ++y)
{
output += String.Format("{0} ", y+1).PadLeft(3);
for(x=0; x<size.Width; ++x)
{
switch(grid[x,y])
{
case (int)Shot.None: disp = ""; break;
case (int)Shot.Hit: disp = "#"; break;
case (int)Shot.Miss: disp = "."; break;
case (int)Shot.Unresolved: disp = "?"; break;
default: disp = "!"; break;
}
output += String.Format("| {0} ", disp.PadLeft(2));
}
output += "|\n" + horzDiv;
}
return output;
}
protected Int32[,] grid;
protected Size size;
}
public class HunterBoard
{
public HunterBoard(USSMissouri root, Size boardsize, Ship target)
{
size = boardsize;
grid = new int[size.Width , size.Height];
Array.Clear(grid,0,size.Width*size.Height);
Player = root;
Target = target;
Initialize();
}
public void Initialize()
{
int x, y, i;
for(y=0; y<size.Height; ++y)
{
for(x=0; x<size.Width - Target.Length+1; ++x)
{
for(i=0; i<Target.Length; ++i)
{
grid[x+i,y]++;
}
}
}
for(y=0; y<size.Height-Target.Length+1; ++y)
{
for(x=0; x<size.Width; ++x)
{
for(i=0; i<Target.Length; ++i)
{
grid[x,y+i]++;
}
}
}
}
public int this[int c,int r]
{
get { return grid[c,r]; }
set { grid[c,r] = value; }
}
public int this[Point p]
{
get { return grid[p.X, p.Y]; }
set { grid[p.X, p.Y] = value; }
}
public void ShotMiss(Point p)
{
int x,y;
int min, max;
min = Math.Max(p.X-Target.Length+1, 0);
max = Math.Min(p.X, size.Width-Target.Length);
for(x=min; x<=max; ++x)
{
DecrementRow(p.Y, x, x+Target.Length-1);
}
min = Math.Max(p.Y-Target.Length+1, 0);
max = Math.Min(p.Y, size.Height-Target.Length);
for(y=min; y<=max; ++y)
{
DecrementColumn(p.X, y, y+Target.Length-1);
}
grid[p.X, p.Y] = 0;
}
public void ShotHit(Point p)
{
}
public override String ToString()
{
String output = String.Format("Target size is {0}\n", Target.Length);
String horzDiv = " +----+----+----+----+----+----+----+----+----+----+\n";
int x,y;
output += " A B C D E F G H I J \n" + horzDiv;
for(y=0; y<size.Height; ++y)
{
output += String.Format("{0} ", y+1).PadLeft(3);
for(x=0; x<size.Width; ++x)
{
output += String.Format("| {0} ", grid[x,y].ToString().PadLeft(2));
}
output += "|\n" + horzDiv;
}
return output;
}
// If we shoot at point P, how does that affect the potential of the board?
public Int32 GetWeightAt(Point p)
{
int x,y;
int potential = 0;
int min, max;
min = Math.Max(p.X-Target.Length+1, 0);
max = Math.Min(p.X, size.Width-Target.Length);
for(x=min; x<=max; ++x)
{
if (Player.theShotBoard.isMissInRow(p.Y, x, x+Target.Length-1) == false)
{
++potential;
}
}
min = Math.Max(p.Y-Target.Length+1, 0);
max = Math.Min(p.Y, size.Height-Target.Length);
for(y=min; y<=max; ++y)
{
if (Player.theShotBoard.isMissInColumn(p.X, y, y+Target.Length-1) == false)
{
++potential;
}
}
return potential;
}
public void DecrementRow(int row, int rangeA, int rangeB)
{
int x;
for(x=rangeA; x<=rangeB; ++x)
{
grid[x,row] = (grid[x,row]==0)? 0 : grid[x,row]-1;
}
}
public void DecrementColumn(int col, int rangeA, int rangeB)
{
int y;
for(y=rangeA; y<=rangeB; ++y)
{
grid[col,y] = (grid[col,y]==0)? 0 : grid[col,y]-1;
}
}
private Ship Target = null;
private USSMissouri Player;
private Int32[,] grid;
private Size size;
}
public enum Shot
{
None = 0,
Hit = 1,
Miss = 2,
Unresolved = 3
};
public class ShotBoard
{
public ShotBoard(Size boardsize)
{
size = boardsize;
grid = new Shot[size.Width , size.Height];
for(int y=0; y<size.Height; ++y)
{
for(int x=0; x<size.Width; ++x)
{
grid[x,y] = Shot.None;
}
}
}
public Shot this[int c,int r]
{
get { return grid[c,r]; }
set { grid[c,r] = value; }
}
public Shot this[Point p]
{
get { return grid[p.X, p.Y]; }
set { grid[p.X, p.Y] = value; }
}
public override String ToString()
{
String output = "";
String horzDiv = " +----+----+----+----+----+----+----+----+----+----+\n";
String disp;
int x,y;
output += " A B C D E F G H I J \n" + horzDiv;
for(y=0; y<size.Height; ++y)
{
output += String.Format("{0} ", y+1).PadLeft(3);
for(x=0; x<size.Width; ++x)
{
switch(grid[x,y])
{
case Shot.None: disp = ""; break;
case Shot.Hit: disp = "#"; break;
case Shot.Miss: disp = "."; break;
case Shot.Unresolved: disp = "?"; break;
default: disp = "!"; break;
}
output += String.Format("| {0} ", disp.PadLeft(2));
}
output += "|\n" + horzDiv;
}
return output;
}
// Functions to find shots on the board, at a specific point, or in a row or column, within a range
public bool ShotAt(Point p)
{
return !(this[p]==Shot.None);
}
public bool isMissInColumn(int col, int rangeA, int rangeB)
{
for(int y=rangeA; y<=rangeB; ++y)
{
if (grid[col,y] == Shot.Miss)
{
return true;
}
}
return false;
}
public bool isMissInRow(int row, int rangeA, int rangeB)
{
for(int x=rangeA; x<=rangeB; ++x)
{
if (grid[x,row] == Shot.Miss)
{
return true;
}
}
return false;
}
protected Shot[,] grid;
protected Size size;
}
}
