Little Dipu is a small kid and like all the other kids, he likes to play, but he plays with numbers (He is extraordinary you know). Now-a-days Dipu has some extra interest in odd numbers. So, he says that a number N is interesting if it has odd number of divisors. Now Dipu turns to you and asks you to tell him how many interesting numbers are there between two given numbers, L and R (both inclusive).
Input
First line of input contains the number of test cases T. Each of the next T lines contains two space separated integers L and R.

Output
For each test case, output an integer, denoting the count of interesting numbers between L and R (both inclusive).

Constraints
1 ≤ T ≤ 100000

1 ≤ L ≤ R ≤ 10^18

SAMPLE INPUT
2
1 3
6 10

SAMPLE OUTPUT
1
1

Explanation

In 1st test case, 1 has 1 divisor, 2 has 2 divisors and 3 also has 2 divisors. So only 1 has odd number of divisors. Hence count of interesting numbers is 1.

In 2nd test case, 9 is the only number to have odd number of divisors. So answer is again 1.

见题面

见题面