mirror of
https://codeberg.org/andyscott/exercism.git
synced 2024-11-09 21:30:47 -05:00
53 lines
No EOL
1 KiB
Markdown
53 lines
No EOL
1 KiB
Markdown
# Collatz Conjecture
|
|
|
|
Welcome to Collatz Conjecture on Exercism's C Track.
|
|
If you need help running the tests or submitting your code, check out `HELP.md`.
|
|
|
|
## Instructions
|
|
|
|
The Collatz Conjecture or 3x+1 problem can be summarized as follows:
|
|
|
|
Take any positive integer n.
|
|
If n is even, divide n by 2 to get n / 2.
|
|
If n is odd, multiply n by 3 and add 1 to get 3n + 1.
|
|
Repeat the process indefinitely.
|
|
The conjecture states that no matter which number you start with, you will always reach 1 eventually.
|
|
|
|
Given a number n, return the number of steps required to reach 1.
|
|
|
|
## Examples
|
|
|
|
Starting with n = 12, the steps would be as follows:
|
|
|
|
0. 12
|
|
1. 6
|
|
2. 3
|
|
3. 10
|
|
4. 5
|
|
5. 16
|
|
6. 8
|
|
7. 4
|
|
8. 2
|
|
9. 1
|
|
|
|
Resulting in 9 steps.
|
|
So for input n = 12, the return value would be 9.
|
|
|
|
## Source
|
|
|
|
### Created by
|
|
|
|
- @RealBarrettBrown
|
|
|
|
### Contributed to by
|
|
|
|
- @bcc32
|
|
- @h-3-0
|
|
- @patricksjackson
|
|
- @QLaille
|
|
- @ryanplusplus
|
|
- @wolf99
|
|
|
|
### Based on
|
|
|
|
An unsolved problem in mathematics named after mathematician Lothar Collatz - https://en.wikipedia.org/wiki/3x_%2B_1_problem |