N = gets.to_i

N.times do
  a, b = gets.split.map(&:to_i)

  ok = 10 ** 18
  ng = 0

  while (ok - ng).abs >= 2
    x = (ok + ng) / 2
    v = x ** 2 - (a + b)

    if v >= 0 && 4 * a * b < v * v
      ok = x
    else
      ng = x
    end
  end

  puts ok
end