Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 40

Python
1

Tell us what’s happening:

Describe your issue in detail here.
shouldnt this if statement execute when odd? i could be overlooking an error somewhere else in the problem

Your code so far

NUMBER_OF_DISKS = 4
number_of_moves = 2**NUMBER_OF_DISKS - 1
rods = {
    'A': list(range(NUMBER_OF_DISKS, 0, -1)),
    'B': [],
    'C': []
}

def make_allowed_move(rod1, rod2):    
    forward = False
    if not rods[rod2]:
        forward = True
    elif rods[rod1] and rods[rod1][-1] < rods[rod2][-1]:
        forward = True
                      
    if forward:
        print(f'Moving disk {rods[rod1][-1]} from {rod1} to {rod2}')
        rods[rod2].append(rods[rod1].pop())
    else:
        print(f'Moving disk {rods[rod2][-1]} from {rod2} to {rod1}')
        rods[rod1].append(rods[rod2].pop())
    
    # display our progress
    print(rods, '\n')

def move(n, source, auxiliary, target):
    # display starting configuration
    print(rods, '\n')
    for i in range(number_of_moves):
        remainder = (i + 1) % 3
        if remainder == 1:
            if n % 2 != 0:
                print(f'Move {i + 1} allowed between {source} and {target}')
                make_allowed_move(source, target)

/* User Editable Region */

            else:
                print(f'Move {i + 1} allowed between {source} and {auxiliary}')
                # make_allowed_move(source, auxiliary)            

        elif remainder == 2:
            if n % 2 != 0:
                print(f'Move {i + 1} allowed between {source} and {auxiliary}')
                # make_allowed_move(source, auxiliary)


/* User Editable Region */

        elif remainder == 0:
            print(f'Move {i + 1} allowed between {auxiliary} and {target}')
            make_allowed_move(auxiliary, target)
           
# initiate call from source A to target C with auxiliary B
move(NUMBER_OF_DISKS, 'A', 'B', 'C')

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Challenge Information:

Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 40

2

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

3

Hello rqzcnm,

Yes your if statement is correct, but you have to uncomment both of the make_allowed_move function calls.

2 Likes
4

holy sh*t . thanks. I already got a headache but turned out I just read
“Also, turn the # make_allowed_move(source, auxiliary) comment into code”
as
“Also, turn the # make_allowed_move(source, auxiliary) into a comment.”
all the time.

2 Likes
5

Hahaha it happens! Don’t worry about it :blush:

6

You need to add “else statement” even is not in demand!

7

same XD I just forgot to read

8

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