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a4 = []
a7 = []
ans = []
pos = -1
def add (a4,a7,l,r)
sum4 = 0
sum7 = 0
(l..r).each { |i|
sum4 = sum4 + a4[i]
sum7 = sum7 + a7[i]
}
if(sum4 == sum7)
return 1
end
return 0
 
end
t = gets.to_i
len = 0
(1..t).each {
n = gets.to_i
(len+1..n).each {|i|
a4[i] = i.to_s.count('4')
a7[i] = i.to_s.count('7')
len = len + 1
}
 
count = 0
(1..n).each { |l|
(l..n).each{ |r|
 
puts l*r
puts ans.length
if(l*r > pos )
count = count + add(a4,a7,l,r)
else
count = count + ans[l*r]
end
ans[l*r] = count 
pos = l*r
}
}
 
 
#print "#{ans[n-1]}\n"
} 

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• # 2:   hide show   clone   input   102 days 23 hours ago    Success

  result: Success     time: 0s    memory: 4760 kB     returned value: 0

  input:

  1
  3
  

  output:

  1
  0
  2
  2
  3
  3
  4
  4
  6
  5
  9
  7
  
• # 1:   hide show   clone   input   102 days 23 hours ago    Runtime error

  result: Runtime error     time: 0s    memory: 4760 kB     signal: -1

  input:

  2
  1
  10

  output:

  1
  0
  1
  2
  2
  2
  3
  3
  4
  4
  5
  5
  6
  6
  7
  7
  8
  8
  9
  9
  10
  10
  4
  11
  6
  11
  8
  11
  10
  11
  12
  11
  14
  13
  16
  15
  18
  17
  20
  19
  9
  21
  12
  21
  15
  21
  18
  21
  21
  21
  24
  22
  27
  25
  30
  28
  16
  31
  20
  31
  24
  31
  28
  31
  32
  31
  36
  33
  40
  37
  25
  41
  

  stderr:

  prog.rb:37:in `+': nil can't be coerced into Fixnum (TypeError)
  	from prog.rb:37:in `block (3 levels) in <main>'
  	from prog.rb:30:in `each'
  	from prog.rb:30:in `block (2 levels) in <main>'
  	from prog.rb:29:in `each'
  	from prog.rb:29:in `block in <main>'
  	from prog.rb:20:in `each'
  	from prog.rb:20:in `<main>'