Bulls and cows/Player
You are encouraged to solve this task according to the task description, using any language you may know.
The task is to write a player of the Bulls and Cows game, rather than a scorer. The player should give intermediate answers that respect the scores to previous attempts.
Python
<lang python>from itertools import permutations from random import shuffle
try:
raw_input
except:
raw_input = input
try:
from itertools import izip
except:
izip = zip
digits = '123456789' size = 4
def parse_score(score):
score = score.strip().split(',')
return tuple(int(s.strip()) for s in score)
def scorecalc(guess, chosen):
bulls = cows = 0
for g,c in izip(guess, chosen):
if g == c:
bulls += 1
elif g in chosen:
cows += 1
return bulls, cows
choices = list(permutations(digits, size)) shuffle(choices) answers = [] scores = []
print ("Playing Bulls & Cows with %i unique digits\n" % size)
while True:
ans = choices[0]
answers.append(ans)
#print ("(Narrowed to %i possibilities)" % len(choices))
score = raw_input("Guess %2i is %*s. Answer (Bulls, cows)? "
% (len(answers), size, .join(ans)))
score = parse_score(score)
scores.append(score)
#print("Bulls: %i, Cows: %i" % score)
found = score == (size, 0)
if found:
print ("Ye-haw!")
break
choices = [c for c in choices if scorecalc(c, ans) == score]
if not choices:
print ("Bad scoring? nothing fits those scores you gave:")
print (' ' +
'\n '.join("%s -> %s" % (.join(an),sc)
for an,sc in izip(answers, scores)))
break</lang>
Sample output
Playing Bulls & Cows with 4 unique digits Guess 1 is 1935. Answer (Bulls, cows)? 0,2 Guess 2 is 4169. Answer (Bulls, cows)? 0,3 Guess 3 is 6413. Answer (Bulls, cows)? 1,1 Guess 4 is 9612. Answer (Bulls, cows)? 1,1 Guess 5 is 9481. Answer (Bulls, cows)? 3,0 Guess 6 is 9471. Answer (Bulls, cows)? 4,0 Ye-haw!
Sample bad output
If the scores are inconsistent you get output like:
Playing Bulls & Cows with 4 unique digits Guess 1 is 1549. Answer (Bulls, cows)? 0,0 Guess 2 is 3627. Answer (Bulls, cows)? 1,0 Bad scoring? nothing fits those scores you gave: 1549 -> (0, 0) 3627 -> (1, 0)
Tcl
<lang tcl>package require struct::list package require struct::set
proc scorecalc {guess chosen} {
set bulls 0
set cows 0
foreach g $guess c $chosen {
if {$g eq $c} { incr bulls } elseif {$g in $chosen} { incr cows }
} return [list $bulls $cows]
}
- Allow override on command line
set size [expr {$argc ? int($argv) : 4}]
set choices {} struct::list foreachperm p [split 123456789 ""] {
struct::set include choices [lrange $p 1 $size]
} set answers {} set scores {}
puts "Playing Bulls & Cows with $size unique digits\n" fconfigure stdout -buffering none while 1 {
set ans [lindex $choices [expr {int(rand()*[llength $choices])}]]
lappend answers $ans
puts -nonewline \
"Guess [llength $answers] is [join $ans {}]. Answer (Bulls, cows)? "
set score [scan [gets stdin] %d,%d]
lappend scores $score
if {$score eq {$size 0}} {
puts "Ye-haw!" break
}
foreach c $choices[set choices {}] {
if {[scorecalc $c $ans] eq $score} { lappend choices $c }
}
if {![llength $choices]} {
puts "Bad scoring? nothing fits those scores you gave:" foreach a $answers s $scores { puts " [join $a {}] -> ([lindex $s 0], [lindex $s 1])" } break
}
}</lang> Sample Output
Playing Bulls & Cows with 4 unique digits Guess 1 is 8527. Answer (Bulls, cows)? 0,1 Guess 2 is 5143. Answer (Bulls, cows)? 0,2 Guess 3 is 9456. Answer (Bulls, cows)? 2,0 Guess 4 is 9412. Answer (Bulls, cows)? 2,1 Guess 5 is 9481. Answer (Bulls, cows)? 3,0 Guess 6 is 9471. Answer (Bulls, cows)? 4,0 Ye-haw!
Sample Bad Output
Playing Bulls & Cows with 4 unique digits Guess 1 is 6578. Answer (Bulls, cows)? 0,0 Guess 2 is 3241. Answer (Bulls, cows)? 1,0 Bad scoring? nothing fits those scores you gave: 6578 -> (0, 0) 3241 -> (1, 0)