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Re: (Efficiency Golf) Triangular numbers

by blakem (Monsignor)
on May 31, 2001 at 10:30 UTC ( #84475=note: print w/ replies, xml ) Need Help??

in reply to (Efficiency Golf) Triangular numbers

This was a fun one. My solution looks quite similiar to Abigail's in structure, but is not nearly so elegant.

I question how they are really going to judge these based on execution time. Its basically a "find the needle in a haystack" problem, but after you've found it, its pretty easy to write a program that finds it faster the next time around.

For instance: Which one of these wins? Are any thrown out for "cheating"?

1: Brute force, try every concievable set of four numbers (loooong time)

2: Using some sort of filtering at each stage, so not every set of four is used (much quicker)

3: Cleverly ordering the stages, so they are done in an optimum order -- perhaps 'THREE->TEN->ONE->SIX'. (slightly quicker, though is uses information gathered in program 2)

4: Brute force, but coded so that the first set of four you try is the correct answer. (even faster!!!)

5: print "$answer"; (clearly the fastest)

Since there is only one haystack and one needle, how do you determine which program "finds" it, and which has already been told where it is....


Comment on Re: (Efficiency Golf) Triangular numbers
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Re: Re: (Efficiency Golf) Triangular numbers
by blakem (Monsignor) on May 31, 2001 at 12:02 UTC
    Thanks for the efficiency clarification... (i.e. only counts here, not for the magazine prize) I was about to add some "pre-sorting" to my arrays, allowing the answer to magically be the first one I tried.


Re: Re: (Efficiency Golf) Triangular numbers
by tachyon (Chancellor) on May 31, 2001 at 14:22 UTC

    'Cleverly' ordering the stages is the approcah I used. See the code I have just posted


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