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Author Topic: if self.isCoder(): post() #Programming Thread  (Read 907690 times)

MagmaMcFry

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4125 on: March 06, 2013, 05:50:50 pm »

Programmers, always trying to find solutions, never trying to solve problems...
If it says anywhere on the marking criteria 'Must solve for n integers withing x time' I would be very surprised.
If you have two variations of a routine that are writable in the same time, but the first is objectively better than the second, why pick the second?
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Virex

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4126 on: March 06, 2013, 05:53:04 pm »

Couldn't you do this in O(log(n)) time, instead of O(n)?


Code: (pseudocode, my C++ is nonexistant) [Select]
max(number a, number b)
    if a> b
        return a
    else
        return b
    end if
end max


max(array numbers)
    int n = length(numbers)
    case
        n == 0 -> error
        n == 1 -> return numbers(0)
        n == 2 -> return max(numbers(0), numbers(1))
        n => 3 -> return max( max(numbers(0:n/2)), numbers(array(n/2:n))))
    end case
end max
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Max White

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4127 on: March 06, 2013, 05:55:40 pm »

If you have two variations of a routine that are writable in the same time, but the first is objectively better than the second, why pick the second?
Well one reason is to keep your code coherent and compliment with an open and close principle. Sometimes for good design, you have to compromise on speed a little.

Apart from that, so that you can learn how the second works.

MagmaMcFry

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4128 on: March 06, 2013, 05:56:30 pm »

Couldn't you do this in O(log(n)) time, instead of O(n)?


Code: (snopped) [Select]
Since every single array element is compared to, the runtime of your code is necessarily O(n). Only your recursion depth is O(log(n)), the amount of calls to max() is still O(n).
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Virex

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4129 on: March 06, 2013, 05:58:31 pm »

Whelp you're right.


Edit: Screw me, of course you can't find the maximum of an array in log(n) time, since if no assumptions can be made about the array, every element needs to be checked.
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Soadreqm

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4130 on: March 06, 2013, 06:17:41 pm »

If you have two variations of a routine that are writable in the same time, but the first is objectively better than the second, why pick the second?

To maintain my artistic vision.
Some people say that it is bad form to use a GOTO to jump from inside one endless loop to inside another endless loop. I say to hell with those people! My algorithm doesn't actually do anything, okay? It represents the idea of a working algorithm, and if you small-minded traditionalist sticks-in-the-mud can't let go of your ridiculous preconceived notions of "good" and "bad" ways of doing things, you don't deserve to understand my work!
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Max White

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4131 on: March 06, 2013, 06:20:31 pm »

You say that as a joke, but Perl Poetry is a real thing...

kaenneth

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4132 on: March 06, 2013, 07:16:28 pm »


Out of the list of numbers {0,1,1} which one is the largest? (pun slightly intended)

If you are only returning the value of the the largest integer in a set, it's easy to say the result is 1; which is fine for this basic programming exercise. But if the numbers are attributes of objects (like item prices) you're going to have to decide which one, or many to return.

This may seem excessively pedantic; but asking these kinds of questions during programming interviews is how I get employed.
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Skyrunner

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4133 on: March 06, 2013, 08:28:47 pm »

Isn't the textbook answer "refer to the specifications, and if not known consult a supervisor/whoeve wrote it"? XD
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bay12 lower boards IRC:irc.darkmyst.org @ #bay12lb
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GlyphGryph

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4134 on: March 06, 2013, 10:11:23 pm »

If on a time limit and no answer can be found through either of the other sources, and there is not additional time for the discovery phase, establish a standard (the first input, barring information that multiple items is a valid return) and make note of it, along with filing a ticket to confirm this standard later and change this code if it no longer meets the standard.
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Skyrunner

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4135 on: March 06, 2013, 10:51:04 pm »

Help ;_;
We're learning C! With Visual C++ 6.0! And the file extenctions are .cpp! I can't stand anymore ;_;

Also, USBs are blocked, files wiped daily.

I guess I could do a daily Codeblocks+gcc(?) installation. <.< But stiiill.
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bay12 lower boards IRC:irc.darkmyst.org @ #bay12lb
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Skyrunner

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4137 on: March 06, 2013, 10:54:51 pm »

Highschool.
What stumps me is that my school bought thirty copies of VS 6.0 over the past three years instead of 2010, or even codeblocks.

... How? O_o
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bay12 lower boards IRC:irc.darkmyst.org @ #bay12lb
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Sirus

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4138 on: March 06, 2013, 10:56:33 pm »

Well, if it's anything like Visual Studio, you should be able to make it work by naming each file <name>.c

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Skyrunner

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Re: if self.isCoder(): post() #Programming Thread
« Reply #4139 on: March 06, 2013, 11:00:38 pm »

My main problem is that the UI is rather bad, and that I don't have any STL containers to play with D: Also some non-standards gotchas.
The speed of the class is so very slow...
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bay12 lower boards IRC:irc.darkmyst.org @ #bay12lb
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