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5/11 - Best product
Posted by Pha. wonko 70 from on 2010-07-09 11:19:50
I think this level need an explanation like other levels of the same genre.
just tell me if I got it right-I need to find the highest sum of any 4 adjacent numbers?
and the the checksum if a value in the matrix represented by the raw and column?
if I got it right then I believe the level is broken, I built 2 different scripts to solve this level this way.
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5/11 - Best product
Posted by Pha. Sphinx 6553 from on 2010-07-10 01:25:12 Reply
The use of "concatenate" is confusing. I've reworded that part of the description.
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5/11 - Best product
Posted by Pha. wonko 70 from on 2010-07-10 09:56:40 Reply
so if the checksum is 50 and the greatest sum of four numbers is 360 the answer is 50360?
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- Re^2: 5/11 - Best product
  Posted by Pha. Sphinx 6553 from on 2010-07-10 21:50:52 Reply
  Yes :)
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  Huuuuuuu
5/11 - Best product
Posted by Pha. wonko 70 from on 2010-07-16 01:23:06 Reply
10x... ill check my code again :/
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5/11 - Best product
Posted by Viz. s_ha_dum 81 from on 2010-07-17 10:21:56 Reply
So... is it the sum of any four adjacent numbers that I should be calculating?
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- Re^2: 5/11 - Best product
  Posted by Pha. Sphinx 6553 from on 2010-07-17 10:46:30 Reply
  Not sure if I understood your question. It should be the greatest product of four numbers in any direction...
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  Huuuuuuu
- - Re^3: 5/11 - Best product
    Posted by Viz. s_ha_dum 81 from on 2010-07-17 11:16:49 Reply
    Yes. That's what I thought but there is the curious use of the term 'sum' in this thread and at least one affirmative answer to a question concerning sums, not products.
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5/11 - Best product
Posted by Viz. s_ha_dum 81 from on 2010-07-19 00:31:40 Reply
I'm pretty close to thinking that the challenge is broken. I've got a script that passes every test dataset I give it but the challenge won't accept the answer. It would be great if someone could check this.
Are the values supposed to 'wrap' around the table by any chance? Seems like if that were the case it would have been noted in the challenge explanation, though.
Also, while the profiles aren't easily searchable and I could well have missed something, it looks like the last time this was solved was in April which was just before the move. Maybe just a coincidence...
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5/11 - Best product
Posted by Pha. Sphinx 6553 from on 2010-07-19 04:46:22 Reply
This challenge has been solved recently after the last modification:
92 robert 2010-07-18 12:13:33
91 dl719 2010-07-15 04:12:28
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Huuuuuuu
5/11 - Best product
Posted by Viz. s_ha_dum 81 from on 2010-07-19 09:56:41 Reply
Like I said, difficult to search the profiles, but thanks for checking.
What about my question? Should the values wrap around the edges of the table?
Last edited on 2010-07-19 09:56:55 by Viz. s_ha_dum
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- Re^2: 5/11 - Best product
  Posted by Pha. Sphinx 6553 from on 2010-07-19 22:29:08 Reply
  There's no need to search the profiles.
  On the main page (home), look for Level 1, Level 2, ..., Level 9. Mouse over and click on the particular challenge number to display a listing of members who have solved the challenge.
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  Huuuuuuu
5/11 - Best product
Posted by Viz. s_ha_dum 81 from on 2010-07-19 23:42:33 Reply
Ok.
But should the values wrap around the edges of the table? Does, for example, the right hand side of the table link back to the left side of the table as do the asteroids and spaceships in Asteroids?
In a table that looks like this:
1 2 3 4 5
6 7 8 9 10
...
Do you have on the first row 1*2*3*4 and 2*3*4*5 or do you have 1*2*3*4, 2*3*4*5, 3*4*5*1, 4*5*1*2, and 5*1*2*3 ? And similar for the vertical and diagonal products?
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5/11 - Best product
Posted by Pha. wonko 70 from on 2010-07-22 16:55:33 Reply
lol now I understand my mistake! I calculated the sum of the for numbers instead of the product...
just solved it btw...
to s_ha_dum: in your example its only the "1*2*3*4 and 2*3*4*5" options
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- Re^2: 5/11 - Best product
  Posted by Viz. s_ha_dum 81 from on 2010-07-23 18:36:40 Reply
  Thank you.
  I'm even more confused now though. That is what my script does and that is what it does correctly with the test tables I'm giving it. hmm............ I'll try some more.
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5/11 - Best product
Posted by Pha. esh 30 from on 2010-07-22 21:44:20 Reply
i ask again: do we mean that 4 numbers must be neighbours? i mean, in table and required greatest product of 2 numbers:
123
851
819
is the greatest will be 8x9 (skipping 1 in last row), or 8x8 in first column of 2&3 row?

i tried both ways but something is wrong
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5/11 - Best product
Posted by Pha. wonko 70 from on 2010-07-24 02:50:21 Reply
8X8...
if both ways didnt work so why bother asking? somthing is obviously wrong with your code.
check your code again.
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5/11 - Best product
Posted by Pha. esh 30 from on 2010-07-26 13:43:44 Reply
if the table is really dynamic - it will be at least 1/100 chance of maximum product of numbers in horiz/vert. direction, which i tested more than hundred times. i complain about challenge details, they need to be more direct, it's the basic programming challenge in general, wordsearch for example is more difficult to realise.
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esher.ru
- Re^2: 5/11 - Best product
  Posted by Viz. s_ha_dum 81 from on 2010-07-27 16:51:11 Reply
  I still can't make sense of this one. Like I've said, I've got a script that passes every test dataset I give it. I know the answers to my test tables. I've calculated them manually and my script gets it right, over and over. More confusing is that wonko just solved it. Not sure what to do at this point. I kinda walked away from it. Maybe a little distance will help.
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- - Re^3: 5/11 - Best product It's often a good idea
    Posted by Geb. shortbreak 1613 from on 2010-07-29 05:47:05 Reply
    It's often a good idea to go away from a challenge for a while.
    After all .. there are some other challenges, perhaps one of the other challenges that are time limited and have a different data set with each page load.
    Or, for something completely different, stego, crypto or even sth on another site. Clear one's head a bit.
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  - - Re^4: 5/11 - Best product It's often a good idea
      Posted by Viz. s_ha_dum 81 from on 2010-07-29 10:00:42 Reply
      :) That's the plan. I went back to the bottom of the challenge list and have been picking up some that I missed the first time.
      Last edited on 2010-07-29 10:02:40 by Viz. s_ha_dum
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5/11 - Best product
Posted by Pha. Firebeard 27 from on 2010-07-30 12:29:48 Reply
If you submit the correct solution but take too long, do you get back 'Wrong' or another message indicating that you took too long?
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- Re^2: 5/11 - Best product
  Posted by Pha. wonko 70 from on 2010-07-30 13:21:38 Reply
  it writes "Too slow!" in red.
  I even used "sleep" to check it.
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- - Re^3: 5/11 - Best product
    Posted by Pha. Firebeard 27 from on 2010-07-30 13:45:24 Reply
    Not what I was hoping. Looks like I'm in the same boat as s_ha_dum.
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- Re^2: 5/11 - Best product
  Posted by Viz. s_ha_dum 81 from on 2010-07-30 16:22:42 Reply
  I haven't gotten that 'too slow' message on this one, just 'wrong'. Its making me a little crazy.
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- - Re^3: 5/11 - Best product
    Posted by Pha. Firebeard 27 from on 2010-07-31 11:32:16 Reply
    I'm going crazy as well. I worked out how many combinations of 4(excluding reverse) there are by hand and it agrees with the amount my program calculates. I've looked over some of the combinations my program is doing and it matches up with the grid. It calculates the product of 4 numbers correctly. It correctly gets the correct number from row x column y and prepends that to the greatest product. I'm almost 100% certain my program is working as it should, yet I still can't solve it. It's not like my algorithm is some huge, crazy, recursive monster that's only safe to try and debug from within the confines of a padded room. It's about 30 lines of simple, sane code that does exactly what it looks like it does.
    
    Looks like I'm going to have to pen and paper it, then compare with the result of my program.
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  - - Re^4: 5/11 - Best product
      Posted by Viz. s_ha_dum 81 from on 2010-08-08 16:36:26 Reply
      Got it. And I got it with the same code that was failing before, with some changes that shouldn't have effected the math. I assume it was an execution time problem? Unlike wonko, though, I never once got that 'too slow' message, and I have seen it on several other challenges. That, I guess, makes this kind-of a bug report. as well.
      Last edited on 2010-08-08 17:03:54 by Viz. s_ha_dum
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5/11 - Best product
Posted by Viz. s_ha_dum 81 from on 2010-07-31 12:12:35 Reply
Well... my code is Perl so by definition it isn't sane.. :)
Sounds like I've done about what you have to check the code, plus bloat my script with line after line of debugging stuff. Still, I can't work out what is going wrong. And I've pulled off what should be a lot harder, like WeChall's LetterWorm ( a timed wordsearch where the words can spiral and zig-zag around the grid). I'm thinking about a complete rewrite in a different language, probably Python-- when I find the heart to start messing with it again.
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- Re^2: 5/11 - Best product
  Posted by Pha. Firebeard 27 from on 2010-07-31 13:48:35 Reply
  I learned a bit of perl ages ago, it can get quite messy. I've been using python for these programming challenges. Picked it up a few months ago and have quite enjoyed using it.
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5/11 - Best product
Posted by Viz. s_ha_dum 81 from on 2010-07-31 16:10:14 Reply
I picked up Python a few months ago also, while solving cstutoringcenter.com challenges. I solved about 75 or 80 of them in Python, and I like it a lot. I switched to Perl for Rankk's challenges because I figured I should learn something about it. I'm not thrilled.
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- Re^2: 5/11 - Best product
  Posted by Pha. Firebeard 27 from on 2010-08-01 04:48:58 Reply
  That's the same site I picked python up on. I started doing them in C but it was slow going, once I got Python up and running I was knocking those challenges out.
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