from decimal import Decimal
import math
for _ in range(int(input())):
  a, b = map(Decimal, input().split())
  l, r = -1, 1 << 30
  while r - l > 1:
    x = (l + r) // 2
    if 0 < x ** 4 - 2 * (a + b) * x ** 2 + (a + b) ** 2 - 4 * a * b:
      r = x
    else:
      l = x
  print(r)