! Copyright (c) 2008 Aaron Schaefer.
! See http://factorcode.org/license.txt for BSD license.
-USING: ascii io.files kernel math math.functions namespaces make
- project-euler.common sequences splitting io.encodings.ascii ;
+USING: ascii io.encodings.ascii io.files kernel make math math.functions
+ namespaces project-euler.common sequences splitting ;
IN: project-euler.042
! http://projecteuler.net/index.php?section=problems&id=42
! Copyright (c) 2008 Aaron Schaefer.
! See http://factorcode.org/license.txt for BSD license.
-USING: combinators.short-circuit hashtables kernel math
- math.combinatorics math.parser math.ranges project-euler.common sequences
- sorting sets ;
+USING: combinators.short-circuit kernel math math.combinatorics math.parser
+ math.ranges project-euler.common sequences sets sorting ;
IN: project-euler.043
! http://projecteuler.net/index.php?section=problems&id=43
1000 over <range> [ number>digits 3 0 pad-left ] map [ all-unique? ] filter ;
: overlap? ( seq -- ? )
- dup first 2 tail* swap second 2 head = ;
+ [ first 2 tail* ] [ second 2 head ] bi = ;
: clean ( seq -- seq )
[ unclip 1 head prefix concat ] map [ all-unique? ] filter ;
: add-missing-digit ( seq -- seq )
- dup natural-sort 10 swap diff first prefix ;
+ dup natural-sort 10 swap diff prepend ;
: interesting-pandigitals ( -- seq )
17 candidates { 13 11 7 5 3 2 } [
interesting-pandigitals [ 10 digits>integer ] sigma ;
! [ euler043a ] 100 ave-time
-! 19 ms run / 1 ms GC ave time - 100 trials
+! 12 ms ave run time - 2.32 SD (100 trials)
MAIN: euler043a
dup 3 * 1- * 2 / ;
: sum-and-diff? ( m n -- ? )
- 2dup + -rot - [ pentagonal? ] bi@ and ;
+ [ + ] [ - ] 2bi [ pentagonal? ] bi@ and ;
PRIVATE>
[ first2 sum-and-diff? ] filter [ first2 - abs ] map infimum ;
! [ euler044 ] 10 ave-time
-! 8924 ms run / 2872 ms GC ave time - 10 trials
+! 5727 ms ave run time - 1102.38 SD (10 trials)
! TODO: this solution is ugly and not very efficient...find a better algorithm
! Copyright (c) 2008 Eric Mertens.
! See http://factorcode.org/license.txt for BSD license.
-USING: arrays assocs combinators kernel locals math math.order math.ranges
+USING: arrays assocs kernel locals.backend math math.order math.ranges
sequences ;
IN: project-euler.076
100 (euler076) ;
! [ euler076 ] 100 ave-time
-! 704 ms run time - 100 trials
+! 560 ms ave run time - 17.74 SD (100 trials)
MAIN: euler076
! Copyright (c) 2008 Aaron Schaefer.
! See http://factorcode.org/license.txt for BSD license.
-USING: assocs hashtables io.files kernel math math.parser
-namespaces make io.encodings.ascii sequences sets ;
+USING: assocs io.encodings.ascii io.files kernel make math math.parser
+ sequences sets ;
IN: project-euler.079
! http://projecteuler.net/index.php?section=problems&id=79
source-079 >edges topological-sort 10 digits>integer ;
! [ euler079 ] 100 ave-time
-! 2 ms run / 0 ms GC ave time - 100 trials
+! 1 ms ave run time - 1.41 SD (100 trials)
! TODO: prune and diff are relatively slow; topological sort could be
! cleaned up and generalized much better, but it works for this problem
0 swap [ dup zero? not ] [ 10 /mod sq -rot [ + ] dip ] [ ] while drop ;
: chain-ending ( n -- m )
- dup 1 = over 89 = or [ next-link chain-ending ] unless ;
+ dup [ 1 = ] [ 89 = ] bi or [ next-link chain-ending ] unless ;
: lower-endings ( -- seq )
567 [1,b] [ chain-ending ] map ;
! See http://factorcode.org/license.txt for BSD license.
USING: arrays kernel make math math.functions math.matrices math.miller-rabin
math.order math.parser math.primes.factors math.ranges sequences
- sequences.lib sorting unicode.case ;
+ sequences.lib sorting strings unicode.case ;
IN: project-euler.common
! A collection of words used by more than one Project Euler solution