Challenges

Reddit challenges in python language.

Files Code and Result

challenge1_easy

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challenge71_easy.py

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challenge220_easy.py

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challenge228_easydev

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challenge239_easy

'''
Back in middle school, I had a peculiar way of dealing with super boring classes.
I would take my handy pocket calculator and play a "Game of Threes".
Here's how you play it:

First, you mash in a random large number to start with. Then, repeatedly do the following:

    If the number is divisible by 3, divide it by 3.
    If it's not, either add 1 or subtract 1 (to make it divisible by 3), then divide it by 3.

The game stops when you reach "1".

While the game was originally a race against myself in order to hone quick math reflexes,
it also poses an opportunity for some interesting programming challenges.
Today, the challenge is to create a program that "plays" the Game of Threes.
Challenge Description

The input is a single number: the number at which the game starts.
Write a program that plays the Threes game, and outputs a valid sequence of steps
you need to take to get to 1. Each step should be output as the number you start at,
followed by either -1 or 1 (if you are adding/subtracting 1 before dividing), or 0
(if you are just dividing). The last line should simply be 1.
Input Description

The input is a single number: the number at which the game starts.

100

Output Description

The output is a list of valid steps that must be taken to play the game.
Each step is represented by the number you start at, followed by either -1 or 1
(if you are adding/subtracting 1 before dividing), or 0 (if you are just dividing).
The last line should simply be 1.

100 -1
33 0
11 1
4 -1
1

Challenge Input

31337357

'''

lst = [100, 31337357]
for n in lst:

    mod = n % 3

    while True:
        mod = n % 3
        if mod == 0:
            print(int(n), ' ', '0')
            n /= 3
        elif mod == 1:
            print(int(n), ' ', '-1')
            n -= 1
            n /= 3
        else:
            print(int(n), ' ', '1')
            n = n + 1
            n /= 3


        if n == 1:
            print(int(n))
            break

Result

100   -1
33   0
11   1
4   -1
1
31337357   1
10445786   1
3481929   0
1160643   0
386881   -1
128960   1
42987   0
14329   -1
4776   0
1592   1
531   0
177   0
59   1
20   1
7   -1
2   1
1