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n = gets.to_i
a = (1..n).map { rand }
 
m = a.inject(0, :+) / a.size.to_f
d = a.inject(0) { |e| (e - a) ** 2 } / (n - 1)
 
puts "median: #{m}"
puts "dispersion: #{d}"

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• # 2:   hide show   clone   input   105 days 23 hours ago    Runtime error

  result: Runtime error     time: 0.01s    memory: 4904 kB     signal: -1

  input:

  1000

  output: no
  stderr:

  prog.rb:5:in `-': Array can't be coerced into Fixnum (TypeError)
  	from prog.rb:5:in `block in <main>'
  	from prog.rb:5:in `each'
  	from prog.rb:5:in `inject'
  	from prog.rb:5:in `<main>'
  

• # 1:   hide show   clone   input   105 days 23 hours ago    Success

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

  input: no
  output:

  median: NaN
  dispersion: 0