local mfl, mce = math.floor, math.ceil
local q = io.read("*n")

local function solve(x, a, b)
  local v = 1LL * x * x - a - b
  if v < 0LL then
    return false
  end
  if 2000000000LL < v then
    return true
  end
  return 4LL * a * b < v * v
end

for iq = 1, q do
  local a, b = io.read("*n", "*n")
  local l, r = 0, 1000000001
  while 1 < r - l do
    local mid = mfl((l + r) / 2)
    if solve(mid, a, b) then
      r = mid
    else
      l = mid
    end
  end
  print(r)
end