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118
Path_Finding_L1.py
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118
Path_Finding_L1.py
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def initialize_queue_and_visited(start):
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"""
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Initialisiert die Warteschlange (queue) mit dem Startpunkt und das Set der besuchten Knoten (visited).
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Args:
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start (tuple): Startkoordinate im Format (x, y)
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Returns:
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tuple: Ein Tupel bestehend aus der Warteschlange (queue) und dem Set der besuchten Knoten (visited).
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"""
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# raise NotImplementedError("initialize_queue_and_visited() is not implemented yet.")
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queue = [(start[0], start[1], [])]
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visited = {start}
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return (queue,visited)
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def get_neighbors(x, y, maze, visited):
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"""
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Berechnet die gültigen Nachbarn (Nachbarzellen) für einen gegebenen Punkt im Labyrinth.
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Args:
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x (int): Die X-Koordinate des aktuellen Punktes.
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y (int): Die Y-Koordinate des aktuellen Punktes.
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maze (list of list of int): Die 2D-Matrix, die das Labyrinth darstellt.
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visited (set): Das Set der besuchten Knoten.
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Returns:
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list: Eine Liste der Nachbarknoten, die besucht werden können.
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"""
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returnval = []
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for i in (-1, 1):
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if y+i < 0 or y+i > (len(maze[0])-1):
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continue
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position = maze[y+i][x]
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# print(f"\nChecking: ({x},{y+i})")
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if not position and (y,x+i) not in visited:
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print(position)
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returnval.append((x, y+i))
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print(returnval)
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else:
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pass
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for i in (-1,1):
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if x+i < 0 or x+i > len(maze[0]):
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continue
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position = maze[y][x+i]
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# print(f"\nChecking: ({x+i},{y})")
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if not position and (x+i,y) not in visited:
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print(position)
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returnval.append((x+i, y))
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print(returnval)
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else:
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pass
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print(returnval)
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return returnval
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def bfs_maze_solver(maze, start, goal):
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"""
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Führt den Breadth-First Search (BFS) durch, um den kürzesten Pfad im Labyrinth zu finden.
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Args:
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maze (list of list of int): Die 2D-Matrix, die das Labyrinth darstellt.
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start (tuple): Startkoordinate im Format (x, y)
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goal (tuple): Zielkoordinate im Format (x, y)
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Returns:
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list or None: Der kürzeste Pfad als Liste von Koordinaten oder None, wenn kein Pfad gefunden wird.
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"""
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# Initialisiere die Warteschlange und die besuchten Knoten
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queue, visited = initialize_queue_and_visited(start)
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print(queue)
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while queue:
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x,y,path = queue.pop(0)
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if (x,y) == goal:
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return path+[(x,y)]
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else:
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n = get_neighbors(x,y,maze,visited)
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for new_x,new_y in n:
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visited.add((new_x, new_y))
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queue.append((new_x,new_y,path+[(x,y)]))
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return None
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# Füge hier den Code für BFS hinzu.
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# Beispiel-Labyrinth
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maze = [
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[0, 1, 0, 0, 0],
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[0, 1, 0, 1, 0],
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[0, 0, 0, 1, 0],
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[0, 1, 1, 1, 0],
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[0, 0, 0, 0, 0]
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]
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start = (0, 0)
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goal = (4, 4)
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# Finde den kürzesten Pfad mit BFS
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path = bfs_maze_solver(maze, start, goal)
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# Gib das Ergebnis aus
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if path:
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print("Path found:", path)
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exit()
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else:
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print("No path found from start to goal.")
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