A very simple classic problem
It's also known as the famous Collatz Conjecture
It states that for a number, if it's odd, multiply by 2 and add 1
If it's even, divide by 2
This process will eventually reach 1
The task is to calculate the cycle length of all numbers in a given range
And find the maximum cycle length
Note that initially a and b may not be a~b, it could be b~a