Problem 68. Kaprekar Steps
The behavior at x=6174 is artifically set to 0, which taints the pure-recursive solution, but hey it was cool problem!
The K constant is 495 for 3 digits.
So the test with 691 is wrong.
Why tests with only one digit ?
Did I miss something ?
I don't understand the Test Suite for x = 3 and x = 1 too. what should I do in this case?
For x=3, the steps are 3000-0003=2997, 9972-2799=7173, etc.
Problem description is confusing as there are different Kaprekar constants depending on the number of digits. [0 9 495 6174 for 1, 2,3 4 digits respectively.
getting this error:
Internal Server Error - Read
The server encountered an internal error or misconfiguration and was unable to complete your request.
The problem should specify that any number with less than four digits should be filled up to four digits with leading zeros. (e.g. 3 -> 0003)
Very nice and interesting problem!
I like the recursion aspect of this problem.
There is a small correction needed in the problem statement. Not all natural numbers, but 4 digit numbers can be reduced to Kaprekar number by the mentioned method. Similarly 3 digit numbers can be reduced to 495
How it works x = 1？？？？？
For those confused with test cases 2,3 and 5, like myself before, do conversion to 4-digit integer. Here is an example:
x = 1:
1000-0001 = 999
9990-0999 = 8991
9981-1899 = 8082
8820-0288 = 8532
8532-2358 = 6174
Therefore, y_correct = 5
Very nice. Took some few minutes to crack this.
What I did is to convert x into string and then use sort function.
This problem statement is poorly given and leaves out a crucial element- the input number must always have 4 digits, so if 1 is the input, the first iteration should be 1000-0001. the second iteration should be 9990-0999. for the problem as stated, the test suite gives solutions that are incorrect.
Solution CommentsShow comments
Problem Recent Solvers1950
Find the two most distant points
Return elements unique to either input
More from this Author96
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!