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  1. # くだすれPython(超初心者用) その31
  2. # http://e...content-available-to-author-only...h.net/test/read.cgi/tech/1476246889/381
  3.  
  4. $DEBUG = true
  5.  
  6. SRC = '11 + 45 * 1 - 4'
  7. ARR = [1, 2, 3, 4, 5, 6, 7, 8, 9]
  8.  
  9. p SRC.split(/ +/).inject([0, []]) { |(i, xs), x|
  10. 	p ({:i => i, :x => x, :xs => xs}) if $DEBUG
  11.  
  12. 	if /[0-9]+/ =~ x then
  13. 		[i + 1, xs + [ARR[i].to_s]]
  14. 	else
  15. 		[i,     xs + [x]]
  16. 	end
  17. }[1].join(' ')
Success #stdin #stdout 0.02s 9720KB
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{:i=>0, :x=>"11", :xs=>[]}
{:i=>1, :x=>"+", :xs=>["1"]}
{:i=>1, :x=>"45", :xs=>["1", "+"]}
{:i=>2, :x=>"*", :xs=>["1", "+", "2"]}
{:i=>2, :x=>"1", :xs=>["1", "+", "2", "*"]}
{:i=>3, :x=>"-", :xs=>["1", "+", "2", "*", "3"]}
{:i=>3, :x=>"4", :xs=>["1", "+", "2", "*", "3", "-"]}
"1 + 2 * 3 - 4"
https://ideone.com/r7EkMX
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
public

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