programming

Question

programming

Manu · Accepted Answer

Step 1: Ant Movement

import random

def move_ant(m, n):
    # Ensure the grid dimensions are valid
    if m <= 0 or n <= 0:
        raise ValueError("Grid dimensions must be positive integers.")
    
    # Directions the ant can move: up, down, left, right
    directions = [(-1, 0), (1, 0), (0, -1), (0, 1)]
    
    # Initialize the grid
    grid = [[0 for _ in range(n)] for _ in range(m)]
    
    # Randomly spawn the ant inside the grid
    start_x = random.randint(1, m - 2)
    start_y = random.randint(1, n - 2)
    
    # Mark the initial position of the ant
    grid[start_x][start_y] = 'x'
    path = [(start_x, start_y)]
    
    # Function to check if the next position is inside the grid and not the previous position
    def is_valid_move(x, y, prev_x, prev_y):
        return 0 <= x < m and 0 <= y < n and (x, y) != (prev_x, prev_y)
    
    # Move the ant until it escapes the grid
    while True:
        current_x, current_y = path[-1]
        possible_moves = []

        for dx, dy in directions:
            next_x, next_y = current_x + dx, current_y + dy
            if is_valid_move(next_x, next_y, path[-2][0] if len(path) > 1 else None, path[-2][1] if len(path) > 1 else None):
                possible_moves.append((next_x, next_y))
        
        # If no possible moves, the ant is stuck (shouldn't happen in this problem)
        if not possible_moves:
            raise RuntimeError("The ant is stuck and cannot move.")
        
        # Choose a random move from possible moves
        next_x, next_y = random.choice(possible_moves)
        
        # If the ant moves out of the grid, mark the escape
        if next_x == 0 or next_x == m - 1 or next_y == 0 or next_y == n - 1:
            path.append((next_x, next_y))
            break
        
        # Move the ant
        path.append((next_x, next_y))
        grid[next_x][next_y] = 'x'
    
    return grid, path

Explanation:

Grid Initialization: The grid is initialized with zeros.
Ant Spawning: The ant is spawned at a random position inside the grid, ensuring it doesn't start at the border.
Move Validation: The is_valid_move function checks if the next position is inside the grid and not the previous position.
Ant Movement: The ant moves in random directions until it reaches the border, marking the path taken.
Exception Handling: The code includes exception handling for invalid grid dimensions and cases where the ant cannot move (although this shouldn't occur in a properly initialized grid).
Output: The initial and final grids, as well as the path taken by the ant, are printed.

Step 2: Output Generation

def generate_output(grid, path):
    # Print the initial grid
    print("Initial Grid:")
    for row in grid:
        print(" ".join(str(cell) for cell in row))
    
    # Print the path taken by the ant
    print("
Path taken by the ant to escape:")
    for step in path:
        print(step)
    
    # Print the final grid
    print("
Final Grid:")
    for x, y in path:
        grid[x][y] = 'x'
    for row in grid:
        print(" ".join(str(cell) for cell in row))

# Example usage
try:
    grid, path = move_ant(5, 5)
    generate_output(grid, path)
except Exception as e:
    print(f"An error occurred: {e}")

Explanation:

Step 1: Ant Movement:
- The move_ant function initializes the grid, randomly spawns the ant, and moves it until it escapes the grid, ensuring it doesn't move back to the previous position. It returns the initial grid and the path taken by the ant.
Step 2: Output Generation:
- The generate_output function takes the grid and path, then prints the initial grid, path taken, and final grid with the path marked.

Final Code:

import random

def GridEscape(m, n):
    # Ensure the grid dimensions are valid
    if m <= 0 or n <= 0:
        raise ValueError("Grid dimensions must be positive integers.")
    
    # Directions the ant can move: up, down, left, right
    directions = [(-1, 0), (1, 0), (0, -1), (0, 1)]
    
    # Initialize the grid
    grid = [[0 for _ in range(n)] for _ in range(m)]
    
    # Randomly spawn the ant inside the grid
    start_x = random.randint(1, m - 2)
    start_y = random.randint(1, n - 2)
    
    # Mark the initial position of the ant
    g

Computer science

Computer science

Manu

Answer

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