N = int(input())
for i in range(N):
  a, b = map(int, input().split())
  ok = 10 ** 18
  ng = 2
  left = 4 * a * b

  while ng + 1 < ok:
    mid = (ok + ng) // 2
    subright = (mid * mid - a - b)
    right = subright ** 2

    if left < right:
      ok = mid
    else:
      ng = mid

  print(ok)