Codes for Hacker Rank 30 days of code

2-fairness.rb

# Code required to read in the values of k,n and candies.
n = gets.to_i
k = gets.to_i
candy = Array.new(n)

for i in 0..n - 1
  candy[i] = gets.to_i
end

sorted_candies = candy.sort.to_a

fairness = sorted_candies
           .each_with_index
           .map { |e, i| sorted_candies[i + k - 1].nil? ? nil : sorted_candies[i + k - 1] - e }
           .compact
           .min

ans = fairness

puts ans