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  1. require 'pp'
  2. require 'minitest/autorun'
  3.  
  4. F=
  5. # 200
  6. ->g,w,h{m=->y,x,d,v=[]{q=y,x
  7. r=->s{([""]*h+g)[y+h,h].map{|l|(?x*w+l)[x+w,w]}.join.count s}
  8. j=r[?>]-r[?<]
  9. k=r[?v]-r[?^]
  10. q[d=[d,1,0][j*j<=>k*k]]+=[k,j][d]<=>0
  11. v&[q<<d]!=[]?q!=v[-1]:m[*q,v<<q]}
  12. m[0,0,1]}
  13.  
  14. # Debug version
  15. # ->g,w,h{m=->y,x,d,v=[]{r=->s{g[[0,y].max...y+h].map{|l|l[[0,x].max...x+w]}.join.count s}
  16. # j=r[?>]-r[?<]
  17. # k=r[?v]-r[?^]
  18. # q=y,x
  19. #   z=g.map{|l|l.dup}
  20. #   z[[0,y].max...y+h].map!{|l|
  21. #     r=[0,x].max...x+w
  22. #     n = l
  23. #     n[r]=?#*r.size
  24. #     n
  25. #   }
  26. #   puts z
  27. #   p [*q,d]
  28. # q[d=[d,1,0][j*j<=>k*k]]+=[k,j][d]<=>0
  29. # q<<d
  30. #   p q
  31. # puts
  32. # v&[q]!=[]?q!=v[-1]:m[q[0],q[1],d,v<<q]}
  33. # m[0,0,1]}
  34.  
  35. describe :X do
  36.   describe 'Grid 1 (2x2)' do
  37.     before do
  38.       @g = [
  39.         '>v',
  40.         '^<' ]
  41.     end
  42.  
  43.     it 'detects loop for 1x1' do assert F[@g, 1, 1] end
  44.     it 'detects loop for 1x2' do assert F[@g, 1, 2] end
  45.     it 'detects loop for 2x1' do assert F[@g, 2, 1] end
  46.     it 'detects rest for 2x2' do refute F[@g, 2, 2] end
  47.   end
  48.  
  49.   describe 'Grid 2 (3x3)' do
  50.     before do
  51.       @g = [
  52.         '> v',
  53.         '   ',
  54.         '^ <' ]
  55.     end
  56.  
  57.     it 'detects rest for 1x1' do refute F[@g, 1, 1] end
  58.     it 'detects rest for 1x2' do refute F[@g, 1, 2] end
  59.     it 'detects rest for 1x3' do refute F[@g, 1, 3] end
  60.     it 'detects rest for 2x1' do refute F[@g, 2, 1] end
  61.     it 'detects loop for 2x2' do assert F[@g, 2, 2] end
  62.     it 'detects loop for 2x3' do assert F[@g, 2, 3] end
  63.     it 'detects rest for 3x1' do refute F[@g, 3, 1] end
  64.     it 'detects loop for 3x2' do assert F[@g, 3, 2] end
  65.     it 'detects rest for 3x3' do refute F[@g, 3, 3] end
  66.   end
  67.  
  68.   describe 'Grid 3 (4x3)' do
  69.     before do
  70.       @g = [
  71.         '>^>v',
  72.         'v^v ',
  73.         '^ <<',
  74.       ]
  75.     end
  76.  
  77.     it 'detects rest for 2x2' do refute F[@g, 2, 2] end
  78.   end
  79.  
  80.   describe 'Grid 4 (6x5)' do
  81.     before do
  82.       @g = [
  83.         '>v>v>v',
  84.         '^v^v^v',
  85.         '^v^v^v',
  86.         '^>^>^v',
  87.         '^<<<<<']
  88.     end
  89.  
  90.     it 'detects loop for 1x1' do assert F[@g, 1, 1] end
  91.     it 'detects rest for 1x2' do refute F[@g, 1, 2] end
  92.     it 'detects loop for 2x1' do assert F[@g, 2, 1] end
  93.     it 'detects loop for 2x2' do assert F[@g, 2, 2] end
  94.     it 'detects loop for 2x4' do assert F[@g, 2, 4] end
  95.     it 'detects rest for 2x5' do refute F[@g, 2, 5] end
  96.     it 'detects rest for 3x1' do refute F[@g, 3, 1] end
  97.     it 'detects loop for 3x2' do assert F[@g, 3, 2] end
  98.     it 'detects loop for 3x3' do assert F[@g, 3, 3] end
  99.     it 'detects loop for 3x5' do assert F[@g, 3, 5] end
  100.     it 'detects rest for 6x2' do refute F[@g, 6, 2] end
  101.     it 'detects loop for 6x3' do assert F[@g, 6, 3] end
  102.     it 'detects rest for 6x5' do refute F[@g, 6, 5] end
  103.   end
  104.  
  105.   describe 'Grid 5 (10x6)' do
  106.     before do
  107.       @g = [
  108.         '> <vv    <',
  109.         ' v ^ >v v ',
  110.         '  >v^^>vv^',
  111.         '    ^>^ v ',
  112.         '>  v<v  >>',
  113.         '  >v v<^  ']
  114.     end
  115.  
  116.     it 'detects rest for 1x1' do refute F[@g, 1, 1] end
  117.     it 'detects rest for 2x3' do refute F[@g, 2, 3] end
  118.     it 'detects rest for 2x6' do refute F[@g, 2, 6] end
  119.     it 'detects loop for 3x2' do assert F[@g, 3, 2] end
  120.     it 'detects rest for 5x4' do refute F[@g, 5, 4] end
  121.     it 'detects loop for 6x1' do assert F[@g, 6, 1] end
  122.     it 'detects rest for 10x6' do refute F[@g, 10, 6] end
  123.   end
  124.  
  125.   describe 'Incorrect cycle detection' do
  126.     before do
  127.       @g = [
  128.         '>>v ',
  129.         ' >v ',
  130.         '>> >',
  131.         '^  v',
  132.         '^ v ',
  133.         '  <<'
  134.       ]
  135.     end
  136.  
  137.     it 'detects rest for 2x2' do refute F[@g, 2, 2] end
  138.   end
  139. end
  140.  
Success #stdin #stdout 0.14s 10864KB
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Standard input is empty
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Run options: --seed 20883

# Running tests:

...................................

Finished tests in 0.026640s, 1313.7927 tests/s, 1313.7927 assertions/s.

35 tests, 35 assertions, 0 failures, 0 errors, 0 skips
https://ideone.com/k69BmH
language:
Ruby (ruby 2.5.5)
created:
9 years ago
visibility:
public

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