Problem 42386. Faint Receipt

Created by goc3

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Suppose you have a receipt with some numbers that have been smudged or didn't print. In particular, the total amount is missing the first and last digits. The purchase did not involve tax (or you're looking at the subtotal before tax), only one item was purchased, and the quantity of the item is known. Use this data to determine what the total amount was, assuming that the unit cost does not contain a fraction of a cent. The partially known total will be provided as a string with an X for the unknown first and last digits.
In some cases, there will be multiple possible answers. We're going to assume the best and return the lowest possible total. The second missing digit can range from 0 to 9, though the first missing digit is the leading number, and, therefore, cannot be zero.

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Last Solution submitted on Feb 12, 2024

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Alfonso Nieto-Castanon on 17 Jun 2015

there may be a few incorrect tests here (e.g. test 2 with 'X31.6X' and qty=111 should return '531.69' if I am interpreting correctly)

bainhome on 17 Jun 2015

agree with alfonso

James on 17 Jun 2015

I had the same issue with that particular test case.

goc3 on 17 Jun 2015

I've updated the test suite. It should work now. I selected the option to have all previous solutions rescored, but I've never actually seen that option work for other problems I've worked on, so just submit your solutions again. Also, refer to comments on http://www.mathworks.com/matlabcentral/cody/problems/42385-combined-ages-4-non-symmetric-with-multiples-n-3 regarding not being able to use the "Test reference solution" button currently. Is anyone else having that problem?

Jan Orwat on 17 Jun 2015

I believe rescoring doesn't work immediately, but all solutions seem to be rescored now. "Test reference solution" doesn't work for me neither. As far as I remember it's not the first time it doesn't work (on my account), but previous incidents had shorter duration (week or so).

Jan Orwat on 17 Jun 2015

http://www.mathworks.com/matlabcentral/cody/solutions/686845#comment_5568

goc3 on 17 Jun 2015

That link doesn't work as written (at least, it didn't for me). It does function, though, if you truncate the url at #.

Christian Schröder on 20 Nov 2022

Could I convince you to not use isequal() when comparing floating point numbers in the test suite?

goc3 on 12 Apr 2023

Christian, generally, I would change out isequal(). However, in this case, the problem is dealing with currency; therefore, each amount has a fixed precision: two decimal places.

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Problem 42386. Faint Receipt

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Problem 42386. Faint Receipt

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Last 200 Solutions

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