多段階選抜 (Crystal)

多段階選抜
解答日
シリーズ:yieldの練習/ジェネレータを入れ子に/整数平方根・立方根の実装

問題
 

http://nabetani.sakura.ne.jp/hena/ord24eliseq/
https://qiita.com/Nabetani/items/1c83005a854d2c6cbb69

Ruby
2014/8/2(当日)
https://qiita.com/cielavenir/items/9f15e29b73ecf98968a5

C#/Python
2014/8/4
https://qiita.com/cielavenir/items/a1156e6a4f71ddbe5dcb

 
ここから上はdrop_prev_square/drop_prev_cubicをまとめる前の答案

Go/C#/Ruby/Python
2014/8/5
https://qiita.com/cielavenir/items/2a685d3080862f2c2c47

PHP/JavaScript
2014/9/9
https://qiita.com/cielavenir/items/28d613ac3823afbf8407

VB
2014/9/10
https://qiita.com/cielavenir/items/cb7266abd30eadd71c04

D
2015/12/21
https://qiita.com/cielavenir/items/47c9e50ee60bef2847ec

Perl
2017/3/10
https://qiita.com/cielavenir/items/6dfbff749d833c0fd423

Lua
2017/3/13
https://qiita.com/cielavenir/items/c60fe7e8da73487ba062

C++20(TS)
2017/3/15

https://qiita.com/cielavenir/items/e1129ca185008f49cbab (MSVC)
https://qiita.com/cielavenir/items/1cfa90d73d11bb7dc3d4 (clang)

F#
2017/3/17
https://qiita.com/cielavenir/items/a698d6a26824ff53de81

Boo/Nemerle
2017/5/13
https://qiita.com/cielavenir/items/e2a783f0fe4b0fe0ed48

Perl6
2017/5/15
https://qiita.com/cielavenir/items/656ea17fa96c865c4498

Kotlin
2017/5/25
https://qiita.com/cielavenir/items/9c46ce8d9d12e51de285

Crystal
2018/5/8
https://qiita.com/cielavenir/items/1815bfa6a860fd1f90db

MoonScript
2018/6/16
https://qiita.com/cielavenir/items/8b03cce0386f4537b5ad

Julia/Rust
2018/12/20
https://qiita.com/cielavenir/items/3ddf72b06d625da0c4a5

Nim
2018/12/26
https://qiita.com/cielavenir/items/5728944867e609fd52a7

Tcl
2018/12/31
https://qiita.com/cielavenir/items/76cbd9c2022b48c9a2c9

Pascal/Cobra
2019/1/16
https://qiita.com/cielavenir/items/81b81baf8dfc1f877903

Icon
2019/1/17
https://qiita.com/cielavenir/items/889622dcc721f5a4da24

(icbrtの実装に関する)補題
2017/5/11
整数除算であってもn/(x*y)はn/x/yに等しい(ことの証明)
https://qiita.com/cielavenir/items/21a6711afd6be8c18c55

spawnの構文はGoっぽい。

それはともかく。2から9まで配列にProcをセットする部分で、別のProcを噛ませないと、 internal errorで 落ちた。びっくり。


tyama_hena24_enum.cr

#!/usr/bin/env crystal

#http://qiita.com/Nabetani/items/1c83005a854d2c6cbb69
#http://nabetani.sakura.ne.jp/hena/ord24eliseq/

def isqrt(n)
return 0 if n<=0
return 1 if n<4 # 1
x,y=0,n
while x!=y&&x+1!=y
x,y=y,(n/y+y)/2
end
x
end
def icbrt(n)
return -icbrt(n) if n<0
return 0 if n==0
return 1 if n<8 # 1,7
x,y=0,n
while x!=y&&x+1!=y
x,y=y,(n/y/y+y*2)/3
end
x
end

def generate : Channel(Int32)
nxt=Channel(Int32).new
i=1
spawn{
loop{
nxt.send(i)
i+=1
}
}
nxt
end

def drop_prev(check : Int32 -> Bool,prev : Channel(Int32)) : Channel(Int32)
a=prev.receive
b=prev.receive
nxt=Channel(Int32).new
spawn{
loop{
nxt.send(a) if !check.call(b)
a,b=b,prev.receive
}
}
nxt
end

def drop_next(check : Int32 -> Bool,prev : Channel(Int32)) : Channel(Int32)
a=prev.receive
b=prev.receive
nxt=Channel(Int32).new
spawn{
nxt.send(a)
loop{
nxt.send(b) if !check.call(a)
a,b=b,prev.receive
}
}
nxt
end

def drop_n(check : Int32, Int32 -> Bool,n : Int,prev : Channel(Int32)) : Channel(Int32)
nxt=Channel(Int32).new
i=0
spawn{
loop{
i+=1
a=prev.receive
nxt.send(a) if !check.call(i,n)
}
}
nxt
end

is_sq=->(n : Int32){isqrt(n)**2==n}
is_cb=->(n : Int32){icbrt(n)**3==n}
is_multiple=->(i : Int32,n : Int32){i%n==0}
is_le=->(i : Int32,n : Int32){i<=n}

f={
'S' => ->(enm : Channel(Int32)){drop_next(is_sq,enm)},
's' => ->(enm : Channel(Int32)){drop_prev(is_sq,enm)},
'C' => ->(enm : Channel(Int32)){drop_next(is_cb,enm)},
'c' => ->(enm : Channel(Int32)){drop_prev(is_cb,enm)},
'h' => ->(enm : Channel(Int32)){drop_n(is_le,100,enm)},
}
(2..9).each{|i|f[i.to_s[0]]=->(n : Int32){
->(enm : Channel(Int32)){drop_n(is_multiple,n,enm)}
}.call(i)}

#Using below one causes internal error
#Case 0: Module validation failed: inlinable function call in a function with debug info must have a !dbg location
# %156 = call i8* @__crystal_malloc64(i64 ptrtoint (%closure_7* getelementptr (%closure_7, %closure_7* null, i32 1) to i64))
#
#Crystal::CodeGenVisitor#finish:Nil
#Crystal::Compiler#codegen<Crystal::Program, Crystal::ASTNode+, Array(Crystal::Compiler::Source), String>:(Tuple(Array(Crystal::Compiler::CompilationUnit), Array(String)) | Nil)
#Crystal::Compiler#compile<Array(Crystal::Compiler::Source), String>:Crystal::Compiler::Result
#Crystal::Command#run_command<Bool>:Nil
#Crystal::Command#run:(Bool | Crystal::Compiler::Result | IO::FileDescriptor | Nil)
#main

#(2..9).each{|i|f[i.to_s[0]]=
# ->(enm : Channel(Int32)){drop_n(is_multiple,i,enm)}
#}

while s=gets
#cS => f['S'].call(f['c'].call(generate))
enm=s.chomp.chars.reduce(generate){|s,e|f[e].call(s)}
10.times{|i|
print ',' if i>0
print enm.receive
}
puts
STDOUT.flush
end