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whatalnk/abc115-c.rb

Created January 11, 2019 08:44
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AtCoder ABC #115 C
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abc115-c.rb
# https://atcoder.jp/contests/abc115/submissions/3976642
n, k = gets.chomp.split(" ").map(&:to_i)
a = []
n.times do
a << gets.chomp.to_i
end
a.sort!
ret = a[n-1] - a[0]
(0..(n-k)).each do |i|
x = a[i+k-1] - a[i]
if x < ret
ret = x
end
end
puts ret
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