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You have 2 identical glass bulbs with you. Bulb
manufacturer has mentioned that each bulb might withstand a
drop of 200 Feet at maximum. Your task is to find the
height at which the bulb breaks ofcourse with minimum
number of iterations.
Assume that you have 200 blocks of 1 foot each which can be
stacked one by one to create a 200 Feet structure to carry
out the test.
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Answer Posted / ram kumar.y
make the stack into 14 sections such that 10 of them will
have 14 blocks each and rest of the 4 will have 15 blocks
each.i.e., 14*10+15*4=140+60=200 blocks.
coming from the bottom keep dropping the bulb from the
highest blocks in each sections. in the worst case scenario,
the bulb may break in last(14th) section.
with the second bulb, keep dropping the bulb from any one
end of that section(in this case 14th as its the worst case)
which has 15 blocks and the first bulb has been dropped from
one of the 15 blocks. so, it takes 14 more chances(at a
worst case) to find out the block from where the bulb breaks
when dropped. So, the total no. of iterations are 14+14=28(max).
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