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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....

-Blake

In reply to Re: (Efficiency Golf) Triangular numbers by blakem
in thread (Efficiency Golf) Triangular numbers by jepri

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