n = int(input())

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

	l = 0
	r = 10**10
	for i in range(100):
		m = (l + r) // 2

		val = m**2-a-b
		if val < 0 or 4*a*b >= val**2: l = m
		else: r = m
	print(r)

for i in range(n):
	solve()