Ruby, 139 bayt
Lambda işlevi, x ve y'yi argüman olarak alır ve bir dize döndürür
->x,y{c=y-2*n=y-(x>y ?1:0)>>1
x+=-c/2*s=[x-n,c*3].max
x<n||x>n*2?'~<.,,>~~':',<..>, '*(x-n)+'<.,.> '*(2*n-x)+"<%s.> "*c%[?,*s-=c/2*3,?,*3]}
Bir çözüm varsa, tüm koalas + commapillar veya tüm koalas + yengeçlerle yapılabilir.
İlke, asgari miktarda virgül kullanmaktır. Sayı tuhafsa 1 virgül kullanırız. 0 virgül kullanıyor olsak bile, dönemlerden daha fazla virgül olmadıkça, bu durumda 2 kullanırız.
Ticari olmayanlarda (yengeçler + koalalar) kullanılan periyodların sayısı mutlaka aynıdır ve ticari olmayanların sayısı yarıdır (number of periods)-(number of commapillars)
. Tüm koalas için yeterli virgül veya tüm yengeçler için çok fazla virgül varsa, çözüm mümkün değildir. Aksi takdirde, bir çözüm iade ederiz.
Test programında yorum yaptı
netlik için bukalemun yerine "başarısız" kullanır
f=->x,y{c=y-2*n=y-(x>y ?1:0)>>1
#n=noncommapillars=y>>1 as they have 2 periods. c=commapillars=y-2*n, 1 for odd y, 0 for even y.
#if x>y there are too many commas to have 0 commapillars for even y. noncommapillars= y-1 >> 1, so 2 commapillars
x+=-c/2*s=[x-n,c*3].max
# s=number of commas allocated to commapillars. x-n to allow all noncommapillars to be koalas, but at least 3 per commapillar.
#-c/2 == -1 if there are commapillars, 0 if not (Ruby truncates toward -inf). Subtract commas for commapillars from x if necessary
x<n||x>n*2?'fail':',<..>, '*(x-n)+'<.,.> '*(2*n-x)+"<%s.> "*c%[?,*s-=c/2*3,?,*3]}
#if x<n (insufficient commas for all koalas) or x>n*2 (too many for all crabs) return fail. Else...
#return string off crabs, koalas, and (using % operator like sprintf) c commapillars (0..2), the second with 3 commas (if present) and the first with the rest.
10.times{|j|10.times{|i|puts "%-20s %s"%[?.*j+?,*i,f[i,j]]}}
#all x,y from 0..9
Çıktı
, fail
,, fail
,,, fail
,,,, fail
,,,,, fail
,,,,,, fail
,,,,,,, fail
,,,,,,,, fail
,,,,,,,,, fail
. fail
., fail
.,, fail
.,,, <,,,.>
.,,,, <,,,,.>
.,,,,, <,,,,,.>
.,,,,,, <,,,,,,.>
.,,,,,,, <,,,,,,,.>
.,,,,,,,, <,,,,,,,,.>
.,,,,,,,,, <,,,,,,,,,.>
.. fail
.., <.,.>
..,, ,<..>,
..,,, fail
..,,,, fail
..,,,,, fail
..,,,,,, <,,,.> <,,,.>
..,,,,,,, <,,,,.> <,,,.>
..,,,,,,,, <,,,,,.> <,,,.>
..,,,,,,,,, <,,,,,,.> <,,,.>
... fail
..., fail
...,, fail
...,,, fail
...,,,, <.,.> <,,,.>
...,,,,, <.,.> <,,,,.>
...,,,,,, <.,.> <,,,,,.>
...,,,,,,, <.,.> <,,,,,,.>
...,,,,,,,, <.,.> <,,,,,,,.>
...,,,,,,,,, <.,.> <,,,,,,,,.>
.... fail
...., fail
....,, <.,.> <.,.>
....,,, ,<..>, <.,.>
....,,,, ,<..>, ,<..>,
....,,,,, fail
....,,,,,, fail
....,,,,,,, <.,.> <,,,.> <,,,.>
....,,,,,,,, <.,.> <,,,,.> <,,,.>
....,,,,,,,,, <.,.> <,,,,,.> <,,,.>
..... fail
....., fail
.....,, fail
.....,,, fail
.....,,,, fail
.....,,,,, <.,.> <.,.> <,,,.>
.....,,,,,, <.,.> <.,.> <,,,,.>
.....,,,,,,, <.,.> <.,.> <,,,,,.>
.....,,,,,,,, <.,.> <.,.> <,,,,,,.>
.....,,,,,,,,, <.,.> <.,.> <,,,,,,,.>
...... fail
......, fail
......,, fail
......,,, <.,.> <.,.> <.,.>
......,,,, ,<..>, <.,.> <.,.>
......,,,,, ,<..>, ,<..>, <.,.>
......,,,,,, ,<..>, ,<..>, ,<..>,
......,,,,,,, fail
......,,,,,,,, <.,.> <.,.> <,,,.> <,,,.>
......,,,,,,,,, <.,.> <.,.> <,,,,.> <,,,.>
....... fail
......., fail
.......,, fail
.......,,, fail
.......,,,, fail
.......,,,,, fail
.......,,,,,, <.,.> <.,.> <.,.> <,,,.>
.......,,,,,,, <.,.> <.,.> <.,.> <,,,,.>
.......,,,,,,,, <.,.> <.,.> <.,.> <,,,,,.>
.......,,,,,,,,, <.,.> <.,.> <.,.> <,,,,,,.>
........ fail
........, fail
........,, fail
........,,, fail
........,,,, <.,.> <.,.> <.,.> <.,.>
........,,,,, ,<..>, <.,.> <.,.> <.,.>
........,,,,,, ,<..>, ,<..>, <.,.> <.,.>
........,,,,,,, ,<..>, ,<..>, ,<..>, <.,.>
........,,,,,,,, ,<..>, ,<..>, ,<..>, ,<..>,
........,,,,,,,,, <.,.> <.,.> <.,.> <,,,.> <,,,.>
......... fail
........., fail
.........,, fail
.........,,, fail
.........,,,, fail
.........,,,,, fail
.........,,,,,, fail
.........,,,,,,, <.,.> <.,.> <.,.> <.,.> <,,,.>
.........,,,,,,,, <.,.> <.,.> <.,.> <.,.> <,,,,.>
.........,,,,,,,,, <.,.> <.,.> <.,.> <.,.> <,,,,,.>