N = int(input())
for i in range(N):
  A, B = map(int, input().split())
  ng = 0
  ok = 5000000000000000000
  while ok - ng > 1:
    mid = (ok + ng) // 2
    if 4 * A * B < (mid * mid - A - B) ** 2:
      ok = mid
    else:
      ng = mid
  print(ok)