n = int(input())

def solve():
	a, b = map(int, input().split())
	# sqrt(a) + sqrt(b) < x
	# 4ab < (x^2 - a - b) ^ 2

	l = 0
	r = 10**9
	while r - l > 1:
		m = (l + r) // 2
		if 4*a*b < (m**2-a-b)**2: r = m
		else: l = m
	print(r)

for i in range(n):
	solve()