def search(a, b, x):
    y = x * x - a - b
    if y > 0 and y * y > 4 * a * b:
        return True
    return False


n = int(input())

for i in range(n):
    a, b = map(int, input().split())
    l, r = -1, 10 ** 9
    while abs(l - r) > 1:
        mid = (l + r) // 2
        if search(a, b, mid):
            r = mid
        else:
            l = mid

    print(r)