T = gets.to_i

# /\ cost
def f(a, b, c)
  cost = 0

  if a >= b
    d = a - b + 1
    a -= d
    cost += d
  end

  if c >= b
    d = c - b + 1
    c -= d
    cost += d
  end

  if a == c
    cost += 1
    a -= 1
  end

  return Float::INFINITY if a <= 0 || c <= 0

  cost
end

# \/ cost
def g(a, b, c)
  cost = 0

  if a == c
    a -= 1
    cost += 1
  end

  return Float::INFINITY if a <= 0

  if a <= b
    d = b - a + 1
    b -= d
    cost += d
  end

  if c <= b
    d = b - c + 1
    b -= d
    cost += d
  end

  return Float::INFINITY if b <= 0

  cost
end

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

  if a > b && c > b && a != c
    puts 0
  elsif a < b && c < b && a != c
    puts 0
  else
    v = [f(a, b, c), g(a, b, c)].min

    if v == Float::INFINITY
      puts -1
    else
      puts v
    end
  end
end