import sys
input=sys.stdin.readline

n = int(input())
for i in range(n):
    a, b = map(int, input().split())
    c = a * b
    d = a + b
    hi = 10 ** 18
    lw = 0
    while hi - lw > 1:
        mid = (hi + lw) // 2
        if c * 4 < (mid ** 2 - d) ** 2:
            hi = mid
        else:
            lw = mid
    print(hi)