#186913 - 2008-04-15 05:39 AM
KiXgolf 2008 Schmankerl: Check Scanning
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Sealeopard
KiX Master
Registered: 2001-04-25
Posts: 11164
Loc: Boston, MA, USA
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Commemmorating my 24th post:
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The Challenge: Check Scanning
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A bank wishes to use optical character recognition (OCR) to read account numbers from checks. These particular account numbers are written using seven-segment digits. Some image-processing software recognizes horizontal and vertical segments on a scanned check, and converts them to ASCII bars ‘|’ and underscores ‘_’. When correctly printed, the ten digits look like this:
... ._. ._. ... ._. ._. ._. ._. ._. ._.
..| ._| ._| |_| |_. |_. ..| |_| |_| |.|
..| |_. ._| ..| ._| |_| ..| |_| ._| |_|
A bank account has a 9-digit account number. Not all 9-digit numbers are valid; for purposes of error detection and correction, a correct account number d9d8 · · · d1 satisfies the following checksum condition:
(d1 + 2d2 + 3d3 + . . . + 9d9) mod 11 = 0.
Unfortunately, the scanner sometimes makes mistakes: some line segments may be missing. Your task is to write a program that deduces the original number, assuming that:
- when the input represents a valid account number, it is the original number
- at most one digit is garbled
- the scanned image contains no extra segments
The scanner outputs ASCII bars (‘|’ and ‘_’) for segments it sees, and periods for spaces that contain no segment. For example, the following input:
...._.._....._.._.._.._.._.
..|._|._||_||_.|_...||_||_|
..|._.._|..|._||_|..||_|._|
used to be 123456789. Making the second digit into a ‘3’ instead of ‘2’ would violate the checksum condition. Other modifications (such as changing ‘5’ into ‘6’) would violate the “only one garbled digit” criterion.
The input consists of a sequence of account numbers rendered in ASCII. Each account number takes up three lines in an array, and each digit takes up three columns, giving 27 characters per line. There are no blank lines or extra blank columns anywhere. For each test case, the output contains one line giving the nine digits if the correct account number can be determined, the string “failure” if no solutions were found and “ambiguous” if more than one solution was found.
A download is available at http://s91376351.onlinehome.us/kixtart/kixgolf_cs.zip
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Inputs & Outputs
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Input: One array containing a single check number in ASCII
Output: The check number or either of the two words "failure" and "ambiguous"
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Scoring
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The solution must pass all tests in order for it's KiXgolf Score to be considered.
When posting KiXtart Golf Scores, please include the KIXGOLF_*.TXT file that is created in the script directory. It contains some basic information about the computer that the script is run on and the resulting scores.
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Test program
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Test cases are provided to help screen entries and to provide the Golf Score.
Any script that passes the test cases can be submitted. If you are surprised that your solution passed the test cases, please submit it anyway! That will help me identify bugs in the test program.
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KiXtart GOLF - How To Play
================================================================
Most importantly, anybody can play, no age restrictions, no penalties, no handicap!
The object in "real" golf is to hit the ball in the hole in the fewest strokes. The object in KiXtart Golf is to get from input (tee) to target (hole) in the fewest keystrokes.
Example: How many positive elements are in array $a?
Array $a could be of structure $a=[1, 2 ,-3, 4, -5, -7, 8, 9]
One approach:
for $b=0 to ubound($a)
if $a[$b]>0
$c=$c+1
endif
next
for a score of 45.
Another solution is:
DO
$b=$b+1
if $a[$b]>0
$c=$c+1
endif
UNTIL $b>(UBOUND($a)+1)
for a score of 53.
Better approach: Code sample 1
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KiXtart GOLF - The Rules
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1) The goal of KiXtart Golf is to score the lowest strokes.
2) Strokes are all characters in a piece of code except whitespace characters, unless the whitespace character is necessary for the line of code to work. Therefore, carriage returns and line feeds do not count or spaces in between the '=' sign when assigning variables, e.g. '$a = $b' scores 5.
3) Code can be constructed any way you like, as long as it does not generate syntax or other errors when running the script in KiXtart.
4) The final solution MUST pass all test scripts that are part of the KiXtart golf challenge.
7) During the private coding phase, no code is allowed to be posted. Violations result in disqualification of said player.
8) During the public coding phase, code should be posted, reused, and borrowed from other players.
9) The test script contains the official KiXgolf scoring engine
10) Only the person posting a particular score will be recognized for the score, unless the KiXtart Golf Challenge organizer or another delegate posts code on behalf of a player
11) KiXtart Golf (a.k.a KiXgolf) codes must be written inside the KiXgolf UDF collection tags, ';!' and ';!;!' and must be eclosed by the FUNCTION commands
12) Parameter names of the UDF's can be changed and additional optional parameters can be added.
13) Additional helper UDFs can be written as long as they reside inside the ';!' and ';!;!' tags.
14) The use of '$' as a variable is allowed.
15) The UDF layout is up to coder.
16) The UDF is expected to finish in a reasonable time, that is, on modern computers inside 1 hour timeframe.
17) You can submit scores as often as you want.
18) If you reach leading score, you are obligated to post your score immediately so others can try to compete with you.
19) The UDF may only use the KiXtart/KiXforms commands/functions/macros, no other code fragments are allowed.
20) Calls to COM components that are part of a standard default Windows installation are allowed.
21) The use of the KiXforms DLL is also permitted as the KiXforms DLL can now be considered an integral part of KiXtart scripting.
22) Calls to other executables, as long as they are part of a standard default Windows installation are allowed.
23) The UDF should be self-contained (except for any I/O mentioned in the challenge). In particular, you may not do things like fetching extra data from a remote site or file.
24) You may assume ASCII as character set.
25) You may use block comments as the KiXgolf Scoring Engine now supports block comments.
26) You are allowed to only use publicly available versions of KiXtart and KiXforms, private builds or alpha builds are NOT allowed.
27) Your submitted score must include the result print of the KiXgolf test-engine.
28) The SETOPTION() parameters in the KiXgolf script may not be modified and will govern the script behavior. SETOPTION() parameters may change depending on the particular needs of the KiXgolf challenge.
29) Tokenizing the UDF, script, or portions thereof is not allowed.
30) If something is not explicitly denied by the rules, it's allowed.
31) If Confusion arises, arranger of the KiXgolf round has the final say.
32) Additional test cases can be added during the private round by submitting a proposal for a new test case to the BBS. The proposed test case becomes official once it has been added to the existing test cases and the KiXgolf package has been reposted for download. If new test cases are added within 12 hours of private round end the private round will extend by an additional 24 hours. The public round will then start one day later and also end one day later. Not additional test cases will be added during the public round.
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KiXtart GOLF - The Duration of the Competition
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1) Private coding phase: From date/time of posting the tournament challenge to April 19, 10pm EST (BBS+6 time)
2) Public coding phase: From April 19, 10pm EST (BBS+6 time) to April 25, 10pm EST (BBS+6 time)
3) Final results: April 26, 11pm EST (BBS+6 time)
You will need the complete package from http://s91376351.onlinehome.us/kixtart/kixgolf_cs.zip.
Edited by Sealeopard (2008-04-17 03:59 AM)
_________________________
There are two types of vessels, submarines and targets.
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