Interview Question for Support Engineer at A10 Networks:

Try to breakup the numbers into groups of 3 (B1floor, B2floor, remaining).
Let answer be: 55
Try 1 (breakup into 30,30,40remain): B1-Floor 30, B2-Floor 60, B2 breaks, B1 doesn't
So, answer < 60
Try 2: B1-Floor 20, B2-Floor 40, B1, B2 both survive
So, 40 < answer < 60.
Try 3(breaking into three 7's) : B1 - Floor 47, B2-Floor 54, B1,B2 both survive
So answer is bigger than 54 but less than 60.
54<answer < 60.
Try 4 (breaking into 2's): B1 - Floor 56, B2-Floor 58 B1, B2 both break.
So, answer is less than 56 and 58 but more than 54.
So, answer is 55.

Objective is to narrow down the range between a,b where (a<answer<b) at each try.