AtCoder ABC #047 [Ruby]

abc047-a.rb

a, b, c = gets.chomp.split(" ").map(&:to_i)
if (a + b == c) || (b + c == a) || (c + a == b) then
  puts "Yes"
else
  puts "No"
end

abc047-b.rb

w, h, n = gets.chomp.split(" ").map(&:to_i)
mm = Array.new(h){Array.new(w,  true)}
n.times do
  x, y, a = gets.chomp.split(" ").map(&:to_i)
  x -= 1
  y -= 1
  case a
  when 1
    h.times do |i|
      w.times do |j|
        mm[i][j] = false if j <= x
      end
    end
  when 2
    h.times do |i|
      w.times do |j|
        mm[i][j] = false if j > x
      end
    end
  when 3
    h.times do |i|
      if i <= y then
        mm[i] = [false] * w
      end
    end
  when 4
    h.times do |i|
      if i > y then
        mm[i] = [false] * w
      end
    end
  end
end

puts mm.flatten.count{|x| x}

abc047-c.rb

s = gets.chomp
n = s.length
ret = 0
(1..(n-1)).each do |i|
  if s[i] != s[i-1] then
    ret += 1
  end
end
puts ret