| 1 | PROBLEM ArtificialAnt
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| 2 |
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| 3 | CODE <<
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| 4 | public struct Point {
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| 5 | public int x; public int y;
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| 6 | public Point(int x, int y) {
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| 7 | this.x = x;
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| 8 | this.y = y;
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| 9 | }
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| 10 | };
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| 11 |
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| 12 | class World {
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| 13 |
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| 14 | private static string[] LosAltosTrail = new string[] {
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| 15 | " ### ",
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| 16 | " # .###.. ",
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| 17 | " # # # ",
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| 18 | " # # # ",
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| 19 | " ####.##### .############.. . ",
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| 20 | " # . # ",
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| 21 | " # # . ",
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| 22 | " # # . ",
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| 23 | " # # # ",
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| 24 | " . # . ",
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| 25 | " # . . ",
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| 26 | " # . # ",
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| 27 | " # # . ",
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| 28 | " # # ...###. ",
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| 29 | " . .#... # ",
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| 30 | " . . . ",
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| 31 | " # . . ",
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| 32 | " # # .#... ",
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| 33 | " # # # ",
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| 34 | " # # . ",
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| 35 | " # # . ",
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| 36 | " # . ...#. ",
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| 37 | " # . # ",
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| 38 | " ..##..#####. # # ",
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| 39 | " # # # ",
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| 40 | " # # # ",
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| 41 | " # # # ",
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| 42 | " # # # ",
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| 43 | " # # # ",
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| 44 | " # .#####....##.. # ",
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| 45 | " # # # ",
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| 46 | " . # # ",
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| 47 | " .####.. # ",
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| 48 | " #.# ",
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| 49 | " # ",
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| 50 | " # ",
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| 51 | " # ",
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| 52 | " # ",
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| 53 | " # ",
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| 54 | " # ",
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| 55 | " # ",
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| 56 | " ###### ",
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| 57 | " . ",
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| 58 | " # ",
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| 59 | " # ",
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| 60 | " # ",
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| 61 | " # ",
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| 62 | " # ",
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| 63 | " # ",
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| 64 | " #.. ",
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| 65 | " # ",
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| 66 | " # ",
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| 67 | " # ",
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| 68 | " # ",
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| 69 | " # ",
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| 70 | " .###### ",
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| 71 | " . ",
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| 72 | " # ",
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| 73 | " # ",
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| 74 | " # ",
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| 75 | " # ",
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| 76 | " # ",
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| 77 | " # ",
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| 78 | " # ",
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| 79 | " # ",
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| 80 | " # "
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| 81 | };
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| 82 | private char[][] world = LosAltosTrail.Select(l=>l.ToArray()).ToArray();
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| 83 | public int TotalFood = LosAltosTrail.Select(l=>l.Where(c=>c=='#').Count()).Sum();
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| 84 | public int Width { get { return 100; } }
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| 85 | public int Height { get { return 100; } }
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| 86 |
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| 87 | public void Reset() {
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| 88 | for(int row = 0; row<world.Length;row++)
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| 89 | for(int col = 0; col < world[row].Length; col++) {
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| 90 | world[row][col] = LosAltosTrail[row][col];
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | public bool FoodAt(Point p) {
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| 95 | if(p.x < 0 || p.y < 0) return false;
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| 96 | if(world.Length <= p.y) return false;
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| 97 | if(world[p.y].Length <= p.x) return false;
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| 98 | return world[p.y][p.x] == '#';
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| 99 | }
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| 100 | public void RemoveFoodAt(Point p) {
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| 101 | if(world.Length < p.y) return;
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| 102 | if(world[p.y].Length < p.x) return;
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| 103 | world[p.y][p.x] = ' ';
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| 104 | }
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| 105 | }
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| 106 |
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| 107 | enum Direction {West, East, North, South};
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| 108 |
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| 109 | class AntState {
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| 110 | public Point Position { get; set;}
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| 111 | public int MaxSteps { get; set;}
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| 112 | public Direction Direction { get; set; }
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| 113 | public World World { get; set; }
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| 114 | public int Steps { get; set; }
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| 115 | public int FoodEaten { get; set; }
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| 116 |
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| 117 | public AntState() {
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| 118 | Steps = 0;
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| 119 | FoodEaten = 0;
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| 120 | }
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| 121 |
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| 122 | public void TurnLeft() {
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| 123 | if(Steps++ > MaxSteps) return;
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| 124 | switch(Direction) {
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| 125 | case Direction.West: Direction = Direction.South; break;
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| 126 | case Direction.South: Direction = Direction.East; break;
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| 127 | case Direction.East: Direction = Direction.North; break;
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| 128 | case Direction.North: Direction = Direction.West; break;
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| 129 | }
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| 130 | }
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| 131 | public void TurnRight() {
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| 132 | if(Steps++ > MaxSteps) return;
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| 133 | switch(Direction) {
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| 134 | case Direction.West: Direction = Direction.North; break;
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| 135 | case Direction.South: Direction = Direction.West; break;
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| 136 | case Direction.East: Direction = Direction.South; break;
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| 137 | case Direction.North: Direction = Direction.East; break;
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| 138 | }
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| 139 | }
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| 140 | public void MoveForward() {
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| 141 | if(Steps++ > MaxSteps) return;
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| 142 | Position = NextPosition;
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| 143 | if(World.FoodAt(Position)) {
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| 144 | World.RemoveFoodAt(Position);
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| 145 | FoodEaten++;
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| 146 | }
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| 147 | }
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| 148 | public Point NextPosition {
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| 149 | get {
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| 150 | int x, y;
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| 151 | switch(Direction) {
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| 152 | case Direction.West:
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| 153 | x = (Position.x + World.Width - 1) % World.Width;
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| 154 | y = Position.y;
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| 155 | return new Point(x, y);
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| 156 | case Direction.South:
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| 157 | x = Position.x;
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| 158 | y = (Position.y + World.Height + 1) % World.Height;
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| 159 | return new Point(x, y);
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| 160 | case Direction.East:
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| 161 | x = (Position.x + World.Width + 1) % World.Width;
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| 162 | y = Position.y;
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| 163 | return new Point(x, y);
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| 164 | case Direction.North:
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| 165 | x = Position.x;
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| 166 | y = (Position.y + World.Height - 1) % World.Height;
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| 167 | return new Point(x, y);
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| 168 | }
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| 169 | return new Point(-1,-1);
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| 170 | }
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| 171 | }
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| 172 | }
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| 173 |
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| 174 | World CreateWorld() {
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| 175 | var w = new World();
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| 176 | Console.WriteLine("Total food: "+w.TotalFood);
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| 177 | return w;
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| 178 | }
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| 179 |
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| 180 | World world;
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| 181 | >>
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| 182 | INIT <<
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| 183 | world = CreateWorld();
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| 184 | >>
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| 185 |
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| 186 | NONTERMINALS
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| 187 | Ant<<World world, AntState state>>.
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| 188 | IfFoodAhead<<World world, AntState state>>.
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| 189 | Prog2<<World world, AntState state>>.
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| 190 | Prog3<<World world, AntState state>>.
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| 191 |
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| 192 | TERMINALS
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| 193 | Left. Right. Move.
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| 194 |
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| 195 | RULES
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| 196 | Ant<<World world, AntState state>> =
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| 197 | IfFoodAhead<<world, state>>
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| 198 | | Prog2<<world, state>>
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| 199 | | Prog3<<world, state>>
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| 200 | | Left SEM << state.TurnLeft(); >>
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| 201 | | Right SEM << state.TurnRight(); >>
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| 202 | | Move SEM << state.MoveForward(); >>
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| 203 | .
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| 204 |
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| 205 | IfFoodAhead<<World world, AntState state>> =
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| 206 | SEM <<
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| 207 | if(world.FoodAt(state.NextPosition)) {
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| 208 | >>
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| 209 |
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| 210 | Ant<<world, state>> SEM << } else { >>
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| 211 | Ant<<world, state>> SEM << } >>
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| 212 | .
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| 213 |
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| 214 | Prog2<<World world, AntState state>> =
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| 215 | Ant<<world, state>> Ant<<world, state>>
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| 216 | .
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| 217 |
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| 218 | Prog3<<World world, AntState state>> =
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| 219 | Ant<<world, state>> Ant<<world, state>> Ant<<world, state>>
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| 220 | .
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| 221 |
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| 222 |
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| 223 | MAXIMIZE /* could also use the keyword MINIMIZE here */
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| 224 | <<
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| 225 | world.Reset();
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| 226 | var state = new AntState() {Position = new Point(0,0), MaxSteps=400, Direction=Direction.East, World = world};
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| 227 | while(state.Steps < state.MaxSteps) {
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| 228 | Ant(world, state);
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| 229 | }
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| 230 | return (double)state.FoodEaten;
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| 231 | >>
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| 232 | END ArtificialAnt.
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