for _ in range(int(input())):
  a, b = map(int, input().split())
  l, r = -1, 1 << 20
  while r - l > 1:
    x = (l + r) // 2
    if 0 < (x ** 2 - (a + b)) ** 2 - 4 * a * b and x ** 2 - (a + b) > 0:
      r = x
    else:
      l = x
  print(r)