Backtracking/Rat Maze

[dlesnoff]

Repository commit

fbad85d

Python version (python --version)

Python 3.10.9

Dependencies version (pip freeze)

alabaster @ file:///home/ktietz/src/ci/alabaster_1611921544520/work
arrow @ file:///croot/arrow_1676588132104/work
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Expected behavior

>>> maze = [[1, 0, 1, 0, 0],
...         [1, 1, 1, 1, 1],
...         [0, 1, 0, 1, 0],
...         [1, 1, 0, 1, 1],
...         [0, 1, 1, 0, 1]]
>>> solve_maze(maze)
([1, 0, 0, 0, 0]
[1, 1, 1, 1, 0]
[0, 0, 0, 1, 0]
[0, 0, 0, 1, 1]
[0, 0, 0, 0, 1], 1)

Or changing the documentation according to the current examples.

Actual behavior

Documentation is unclear.
« In this problem we have some n by n matrix, a start point and an end point.
We want to go from the start to the end. In this matrix zeroes represent walls
and ones paths we can use. »
But from the examples (reproducible with calls to the solver function):
>>> maze = [[0, 1, 0, 1, 1],
... [0, 0, 0, 0, 0],
... [1, 0, 1, 0, 1],
... [0, 0, 1, 0, 0],
... [1, 0, 0, 1, 0]]
>>> solve_maze(maze)
[1, 0, 0, 0, 0]
[1, 1, 1, 1, 0]
[0, 0, 0, 1, 0]
[0, 0, 0, 1, 1]
[0, 0, 0, 0, 1]

Walls seem to be represented with ones, and valid paths seem to be represented with 0s.
Additionally, the documentation does not describe the output. It seems that the solution returned is the contiguous path given by the 1s.

Nothing is said on the number of the solutions.

[Excergic]

hello i did not get this issue will you please explain what to do in this I want to contribute on this project

[Kunal-Purswani]

Can I contribute?

[457ayan]

can i contribute

[457ayan]

def solve_maze(maze):
# Create a copy of the maze to avoid modifying the original maze
solved_maze = [row[:] for row in maze]

# Get the dimensions of the maze
rows = len(maze)
cols = len(maze[0])

# Define the starting and ending points
start = (0, 0)
end = (rows - 1, cols - 1)

# Call the recursive function to solve the maze
solve_maze_recursive(solved_maze, start, end)

# Return the solved maze and the path length
return solved_maze, solved_maze[end[0]][end[1]]

def solve_maze_recursive(maze, current, end):
# Check if the current position is out of bounds or a wall
if current[0] < 0 or current[0] >= len(maze) or current[1] < 0 or current[1] >= len(maze[0]) or maze[current[0]][current[1]] == 0:
return False

# Check if the current position is the end point
if current == end:
    maze[current[0]][current[1]] = 1
    return True

# Mark the current position as part of the path
maze[current[0]][current[1]] = 1

# Recursively explore all possible directions
if solve_maze_recursive(maze, (current[0] + 1, current[1]), end) or \
   solve_maze_recursive(maze, (current[0] - 1, current[1]), end) or \
   solve_maze_recursive(maze, (current[0], current[1] + 1), end) or \
   solve_maze_recursive(maze, (current[0], current[1] - 1), end):
    return True

# If no path is found, backtrack and mark the current position as a dead end
maze[current[0]][current[1]] = 0
return False

[riiyaa24]

Hello, I would like to work on this issue. Can you please assign this to me?

[LeTsC0D]

Hi Admin, please assign this task to me