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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