defmodule Main do
  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)
  def yn(b), do: IO.puts(if b, do: "Yes", else: "No")

  def main do
    t = ii()
    for _ <- 1..t do
      [a, b, c] = li()
      solve(a, b, c)
      |> IO.puts
    end
  end

  def solve(a, b, c) do
    m = Enum.max([a, b, c])
    cond do
      m == a -> f(a, c, b)
      m == b -> f(b, max(a, c), min(a, c))
      m == c -> f(c, a, b)
    end
  end

  def f(a, b, c) do
    cond do
      a <= b ->
        x = b - a + 1
        res = f(a, b-x, c)
        if res == -1 do
          -1
        else
          x + res
        end

      b <= c ->
        x = c - b + 1
        if c-x <= 0 do
          -1
        else
          x
        end
      true -> 0
    end
  end

  def is_kadomatu(a, b, c) do
    if a == b or b == c or c == a do
      false
    else
      [_, x, _] = Enum.sort([a, b, c])
      b != x
    end
  end
end