/extra/project-euler/054/054.factor

 1! Copyright (c) 2009 Aaron Schaefer.
 2! See http://factorcode.org/license.txt for BSD license.
 3USING: arrays io.encodings.ascii io.files kernel math.order poker
 4    project-euler.common sequences ;
 5IN: project-euler.054
 6
 7! http://projecteuler.net/index.php?section=problems&id=54
 8
 9! DESCRIPTION
10! -----------
11
12! In the card game poker, a hand consists of five cards and are ranked, from
13! lowest to highest, in the following way:
14
15!     * High Card: Highest value card.
16!     * One Pair: Two cards of the same value.
17!     * Two Pairs: Two different pairs.
18!     * Three of a Kind: Three cards of the same value.
19!     * Straight: All cards are consecutive values.
20!     * Flush: All cards of the same suit.
21!     * Full House: Three of a kind and a pair.
22!     * Four of a Kind: Four cards of the same value.
23!     * Straight Flush: All cards are consecutive values of same suit.
24!     * Royal Flush: Ten, Jack, Queen, King, Ace, in same suit.
25
26! The cards are valued in the order:
27!     2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King, Ace.
28
29! If two players have the same ranked hands then the rank made up of the
30! highest value wins; for example, a pair of eights beats a pair of fives (see
31! example 1 below). But if two ranks tie, for example, both players have a pair
32! of queens, then highest cards in each hand are compared (see example 4
33! below); if the highest cards tie then the next highest cards are compared,
34! and so on.
35
36! Consider the following five hands dealt to two players:
37
38!     Hand   Player 1            Player 2              Winner
39!     ---------------------------------------------------------
40!     1      5H 5C 6S 7S KD      2C 3S 8S 8D TD
41!            Pair of Fives       Pair of Eights        Player 2
42
43!     2      5D 8C 9S JS AC      2C 5C 7D 8S QH
44!            Highest card Ace    Highest card Queen    Player 1
45
46!     3      2D 9C AS AH AC      3D 6D 7D TD QD
47!            Three Aces          Flush with Diamonds   Player 2
48
49!     4      4D 6S 9H QH QC      3D 6D 7H QD QS
50!            Pair of Queens      Pair of Queens
51!            Highest card Nine   Highest card Seven    Player 1
52
53!     5      2H 2D 4C 4D 4S      3C 3D 3S 9S 9D
54!            Full House          Full House
55!            With Three Fours    With Three Threes     Player 1
56
57! The file, poker.txt, contains one-thousand random hands dealt to two players.
58! Each line of the file contains ten cards (separated by a single space): the
59! first five are Player 1's cards and the last five are Player 2's cards. You
60! can assume that all hands are valid (no invalid characters or repeated
61! cards), each player's hand is in no specific order, and in each hand there is
62! a clear winner.
63
64! How many hands does Player 1 win?
65
66
67! SOLUTION
68! --------
69
70<PRIVATE
71
72: source-054 ( -- seq )
73    "resource:extra/project-euler/054/poker.txt" ascii file-lines
74    [ [ 14 head-slice ] [ 14 tail-slice* ] bi 2array ] map ;
75
76PRIVATE>
77
78: euler054 ( -- answer )
79    source-054 [ [ string>value ] map first2 before? ] count ;
80
81! [ euler054 ] 100 ave-time
82! 34 ms ave run time - 2.65 SD (100 trials)
83
84SOLUTION: euler054