Myntra Interview Question for Senior Software Development Engineers

Country: India
Interview Type: In-Person

Comment hidden because of low score. Click to expand.
of 0 vote

You forgot to say that you have only 2 eggs.

Keep doubling the floor you try with first egg.

Try first, 2nd, 4th, 8th, ....

Finally it will break at some 2^(k+1) th floor

But it didn't break on 2^k floor.

Now linear scan from 2^k to 2^(k+1) with second egg.

Might be better ideas?

- GENIUS February 20, 2014 | Flag Reply
Comment hidden because of low score. Click to expand.
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In case there are only 2 eggs.
Lets say we have N floors and I choose a constant step size of x
No of steps to find the floor where it breaks = N/x + x
First part to identify the block size where it breaks
Second part to check for each floor in the block to identify the exact floor where it breaks
Now its just a problem of minimizing it which can be solved by differentiation, which gives x = sqrt(N)

In case of infinite eggs binary search is the right option.

- kr.neerav February 20, 2014 | Flag Reply
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of 0 vote

There is one more dimension to this problem. It is the number of tries you are allowed.
There are three variables here -
1. No. of eggs - k
2. No. of floors - n
3. No. of tries allowed - q

This problem will then have an optimal substructure property and the recurrence will be the following -
MR is the function calculating the same -

MR(q,k)={1for k=0∨q=0
MR(q−1,k−1)+MR(q−1,k) for k>0∧q>0
MR(q,k) is the maximum number of floors 0..n−1 we can have ,if we have q tries and k eggs to break.

Note that MR(q,q+1)=MR(q,q) because the additional jar cannot be used.MR(q,q)=2^q.

- DE2.0 February 23, 2014 | Flag Reply

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