def solve(A, B):
  C = A + B
  D = A - B
  left = 0
  right = 10 ** 12
  while right - left > 1:
    mid = (left + right) // 2
    X2 = mid ** 2
    if D ** 2 > X2 * (2 * C - X2):
      right = mid
    else:
      left = mid
  return right

N = int(input())
for _ in range(N):
  A, B = [int(x) for x in input().split()]
  print(solve(A, B))