[9519] | 1 | PROBLEM ArtificialAnt
|
---|
| 2 |
|
---|
| 3 | CODE <<
|
---|
| 4 | public struct Point {
|
---|
| 5 | public int x; public int y;
|
---|
| 6 | public Point(int x, int y) {
|
---|
| 7 | this.x = x;
|
---|
| 8 | this.y = y;
|
---|
| 9 | }
|
---|
| 10 | };
|
---|
| 11 |
|
---|
| 12 | class World {
|
---|
| 13 |
|
---|
| 14 | private static string[] LosAltosTrail = new string[] {
|
---|
| 15 | " ### ",
|
---|
| 16 | " # .###.. ",
|
---|
| 17 | " # # # ",
|
---|
| 18 | " # # # ",
|
---|
| 19 | " ####.##### .############.. . ",
|
---|
| 20 | " # . # ",
|
---|
| 21 | " # # . ",
|
---|
| 22 | " # # . ",
|
---|
| 23 | " # # # ",
|
---|
| 24 | " . # . ",
|
---|
| 25 | " # . . ",
|
---|
| 26 | " # . # ",
|
---|
| 27 | " # # . ",
|
---|
| 28 | " # # ...###. ",
|
---|
| 29 | " . .#... # ",
|
---|
| 30 | " . . . ",
|
---|
| 31 | " # . . ",
|
---|
| 32 | " # # .#... ",
|
---|
| 33 | " # # # ",
|
---|
| 34 | " # # . ",
|
---|
| 35 | " # # . ",
|
---|
| 36 | " # . ...#. ",
|
---|
| 37 | " # . # ",
|
---|
| 38 | " ..##..#####. # # ",
|
---|
| 39 | " # # # ",
|
---|
| 40 | " # # # ",
|
---|
| 41 | " # # # ",
|
---|
| 42 | " # # # ",
|
---|
| 43 | " # # # ",
|
---|
| 44 | " # .#####....##.. # ",
|
---|
| 45 | " # # # ",
|
---|
| 46 | " . # # ",
|
---|
| 47 | " .####.. # ",
|
---|
| 48 | " #.# ",
|
---|
| 49 | " # ",
|
---|
| 50 | " # ",
|
---|
| 51 | " # ",
|
---|
| 52 | " # ",
|
---|
| 53 | " # ",
|
---|
| 54 | " # ",
|
---|
| 55 | " # ",
|
---|
| 56 | " ###### ",
|
---|
| 57 | " . ",
|
---|
| 58 | " # ",
|
---|
| 59 | " # ",
|
---|
| 60 | " # ",
|
---|
| 61 | " # ",
|
---|
| 62 | " # ",
|
---|
| 63 | " # ",
|
---|
| 64 | " #.. ",
|
---|
| 65 | " # ",
|
---|
| 66 | " # ",
|
---|
| 67 | " # ",
|
---|
| 68 | " # ",
|
---|
| 69 | " # ",
|
---|
| 70 | " .###### ",
|
---|
| 71 | " . ",
|
---|
| 72 | " # ",
|
---|
| 73 | " # ",
|
---|
| 74 | " # ",
|
---|
| 75 | " # ",
|
---|
| 76 | " # ",
|
---|
| 77 | " # ",
|
---|
| 78 | " # ",
|
---|
| 79 | " # ",
|
---|
| 80 | " # "
|
---|
| 81 | };
|
---|
| 82 | private char[][] world = LosAltosTrail.Select(l=>l.ToArray()).ToArray();
|
---|
| 83 | public int TotalFood = LosAltosTrail.Select(l=>l.Where(c=>c=='#').Count()).Sum();
|
---|
| 84 | public int Width { get { return 100; } }
|
---|
| 85 | public int Height { get { return 100; } }
|
---|
| 86 |
|
---|
| 87 | public void Reset() {
|
---|
| 88 | world = LosAltosTrail.Select(l=>l.ToArray()).ToArray();
|
---|
| 89 | }
|
---|
| 90 |
|
---|
| 91 | public bool FoodAt(Point p) {
|
---|
| 92 | if(p.x < 0 || p.y < 0) return false;
|
---|
| 93 | if(world.Length <= p.y) return false;
|
---|
| 94 | if(world[p.y].Length <= p.x) return false;
|
---|
| 95 | return world[p.y][p.x] == '#';
|
---|
| 96 | }
|
---|
| 97 | public void RemoveFoodAt(Point p) {
|
---|
| 98 | if(world.Length < p.y) return;
|
---|
| 99 | if(world[p.y].Length < p.x) return;
|
---|
| 100 | world[p.y][p.x] = ' ';
|
---|
| 101 | }
|
---|
| 102 | }
|
---|
| 103 |
|
---|
| 104 | enum Direction {West, East, North, South};
|
---|
| 105 |
|
---|
| 106 | class AntState {
|
---|
| 107 | public Point Position { get; set;}
|
---|
| 108 | public int MaxSteps { get; set;}
|
---|
| 109 | public Direction Direction { get; set; }
|
---|
| 110 | public World World { get; set; }
|
---|
| 111 | public int Steps { get; set; }
|
---|
| 112 | public int FoodEaten { get; set; }
|
---|
| 113 |
|
---|
| 114 | public AntState() {
|
---|
| 115 | Steps = 0;
|
---|
| 116 | FoodEaten = 0;
|
---|
| 117 | }
|
---|
| 118 |
|
---|
| 119 | public void TurnLeft() {
|
---|
| 120 | Steps++;
|
---|
| 121 | switch(Direction) {
|
---|
| 122 | case Direction.West: Direction = Direction.South; break;
|
---|
| 123 | case Direction.South: Direction = Direction.East; break;
|
---|
| 124 | case Direction.East: Direction = Direction.North; break;
|
---|
| 125 | case Direction.North: Direction = Direction.West; break;
|
---|
| 126 | }
|
---|
| 127 | }
|
---|
| 128 | public void TurnRight() {
|
---|
| 129 | Steps++;
|
---|
| 130 | switch(Direction) {
|
---|
| 131 | case Direction.West: Direction = Direction.North; break;
|
---|
| 132 | case Direction.South: Direction = Direction.West; break;
|
---|
| 133 | case Direction.East: Direction = Direction.South; break;
|
---|
| 134 | case Direction.North: Direction = Direction.East; break;
|
---|
| 135 | }
|
---|
| 136 | }
|
---|
| 137 | public void MoveForward() {
|
---|
| 138 | Position = NextPosition;
|
---|
| 139 | Steps++;
|
---|
| 140 | if(World.FoodAt(Position)) {
|
---|
| 141 | World.RemoveFoodAt(Position);
|
---|
| 142 | FoodEaten++;
|
---|
| 143 | }
|
---|
| 144 | }
|
---|
| 145 | public Point NextPosition {
|
---|
| 146 | get {
|
---|
| 147 | int x, y;
|
---|
| 148 | switch(Direction) {
|
---|
| 149 | case Direction.West:
|
---|
| 150 | x = (Position.x + World.Width - 1) % World.Width;
|
---|
| 151 | y = Position.y;
|
---|
| 152 | return new Point(x, y);
|
---|
| 153 | case Direction.South:
|
---|
| 154 | x = Position.x;
|
---|
| 155 | y = (Position.y + World.Height + 1) % World.Height;
|
---|
| 156 | return new Point(x, y);
|
---|
| 157 | case Direction.East:
|
---|
| 158 | x = (Position.x + World.Width + 1) % World.Width;
|
---|
| 159 | y = Position.y;
|
---|
| 160 | return new Point(x, y);
|
---|
| 161 | case Direction.North:
|
---|
| 162 | x = Position.x;
|
---|
| 163 | y = (Position.y + World.Height - 1) % World.Height;
|
---|
| 164 | return new Point(x, y);
|
---|
| 165 | }
|
---|
| 166 | return new Point(-1,-1);
|
---|
| 167 | }
|
---|
| 168 | }
|
---|
| 169 | }
|
---|
| 170 |
|
---|
| 171 | World CreateWorld() {
|
---|
| 172 | var w = new World();
|
---|
| 173 | Console.WriteLine("Total food: "+w.TotalFood);
|
---|
| 174 | return w;
|
---|
| 175 | }
|
---|
| 176 |
|
---|
| 177 | World world;
|
---|
| 178 | >>
|
---|
| 179 | INIT <<
|
---|
| 180 | world = CreateWorld();
|
---|
| 181 | >>
|
---|
| 182 |
|
---|
| 183 | NONTERMINALS
|
---|
| 184 | Ant<<World world, AntState state>>.
|
---|
| 185 | IfFoodAhead<<World world, AntState state>>.
|
---|
| 186 | Prog2<<World world, AntState state>>.
|
---|
| 187 | Prog3<<World world, AntState state>>.
|
---|
| 188 |
|
---|
| 189 | TERMINALS
|
---|
[9846] | 190 | Left. Right. Move.
|
---|
[9519] | 191 |
|
---|
| 192 | RULES
|
---|
| 193 | Ant<<World world, AntState state>> =
|
---|
| 194 | IfFoodAhead<<world, state>>
|
---|
| 195 | | Prog2<<world, state>>
|
---|
| 196 | | Prog3<<world, state>>
|
---|
[9846] | 197 | | Left SEM << state.TurnLeft(); >>
|
---|
| 198 | | Right SEM << state.TurnRight(); >>
|
---|
| 199 | | Move SEM << state.MoveForward(); >>
|
---|
[9519] | 200 | .
|
---|
| 201 |
|
---|
| 202 | IfFoodAhead<<World world, AntState state>> =
|
---|
| 203 | SEM <<
|
---|
| 204 | if(world.FoodAt(state.NextPosition)) {
|
---|
| 205 | >>
|
---|
| 206 |
|
---|
| 207 | Ant<<world, state>> SEM << } else { >>
|
---|
| 208 | Ant<<world, state>> SEM << } >>
|
---|
| 209 | .
|
---|
| 210 |
|
---|
| 211 | Prog2<<World world, AntState state>> =
|
---|
| 212 | Ant<<world, state>> Ant<<world, state>>
|
---|
| 213 | .
|
---|
| 214 |
|
---|
| 215 | Prog3<<World world, AntState state>> =
|
---|
| 216 | Ant<<world, state>> Ant<<world, state>> Ant<<world, state>>
|
---|
| 217 | .
|
---|
| 218 |
|
---|
| 219 |
|
---|
| 220 | MAXIMIZE /* could also use the keyword MINIMIZE here */
|
---|
| 221 | <<
|
---|
| 222 | world.Reset();
|
---|
| 223 | var state = new AntState() {Position = new Point(0,0), MaxSteps=400, Direction=Direction.East, World = world};
|
---|
| 224 | while(state.Steps < state.MaxSteps) {
|
---|
| 225 | Ant(world, state);
|
---|
| 226 | }
|
---|
| 227 | return (double)state.FoodEaten;
|
---|
| 228 | >>
|
---|
[9846] | 229 | END ArtificialAnt.
|
---|