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whatalnk/abc090-a.rb

Created March 12, 2018 03:10
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AtCoder ABC #090
Raw
abc090-a.rb
a = gets.chomp
b = gets.chomp
c = gets.chomp
puts "#{a[0]}#{b[1]}#{c[2]}"
Raw
abc090-b.rb
a, b = gets.chomp.split(" ").map(&:to_i)
ans = 0
(a..b).each do |i|
x = i.to_s
ans += 1 if x == x.reverse
end
puts ans
Raw
abc090-c.rb
a, b = gets.chomp.split(" ").map(&:to_i)
if a == 1 && b == 1
puts 1
elsif a == 1 || b == 1 then
puts a * b - 2
else
puts a * b - ((a - 2 + b - 2) * 2 + 4)
end
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