33 lines
951 B
Factor
33 lines
951 B
Factor
! Copyright (c) 2007, 2008 Aaron Schaefer.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: ascii kernel math.ranges math.text.english sequences
|
|
project-euler.common ;
|
|
IN: project-euler.017
|
|
|
|
! http://projecteuler.net/index.php?section=problems&id=17
|
|
|
|
! DESCRIPTION
|
|
! -----------
|
|
|
|
! If the numbers 1 to 5 are written out in words: one, two, three, four, five;
|
|
! there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.
|
|
|
|
! If all the numbers from 1 to 1000 (one thousand) inclusive were written out
|
|
! in words, how many letters would be used?
|
|
|
|
! NOTE: Do not count spaces or hyphens. For example, 342 (three hundred and
|
|
! forty-two) contains 23 letters and 115 (one hundred and fifteen) contains
|
|
! 20 letters.
|
|
|
|
|
|
! SOLUTION
|
|
! --------
|
|
|
|
: euler017 ( -- answer )
|
|
1000 [1,b] SBUF" " clone [ number>text over push-all ] reduce [ Letter? ] count ;
|
|
|
|
! [ euler017 ] 100 ave-time
|
|
! 15 ms ave run time - 1.71 SD (100 trials)
|
|
|
|
SOLUTION: euler017
|