logic q4

logic/logicPlan.py

@@ -362,9 +362,30 @@ def positionLogicPlan(problem) -> List:
     actions = [ 'North', 'South', 'East', 'West' ]
     KB = []
 
-    "*** BEGIN YOUR CODE HERE ***"
-    util.raiseNotDefined()
-    "*** END YOUR CODE HERE ***"
+    # Initial position at time 0
+    KB.append(PropSymbolExpr(pacman_str, x0, y0, time=0))
+
+    for t in range(50):
+        # Pacman is at exactly one non-wall position at time t
+        pacman_positions = [PropSymbolExpr(pacman_str, x, y, time=t) for x, y in non_wall_coords]
+        KB.append(exactlyOne(pacman_positions))
+
+        # Pacman takes exactly one action at time t
+        action_symbols = [PropSymbolExpr(action, time=t) for action in actions]
+        KB.append(exactlyOne(action_symbols))
+
+        if t > 0:
+            # Add transition models for each non-wall coordinate
+            for x, y in non_wall_coords:
+                KB.append(pacmanSuccessorAxiomSingle(x, y, t, walls_grid))
+
+        # Check if Pacman is at the goal position at time t
+        goal_expr = PropSymbolExpr(pacman_str, xg, yg, time=t)
+        model = findModel(conjoin(KB + [goal_expr]))
+        if model:
+            return extractActionSequence(model, actions)
+
+    return []
 
 #______________________________________________________________________________
 # QUESTION 5