Hi,
I had the first round of phone interview with Amazon.
Interviewer asked me only 3 questions. Almost all telephonic interviews will be of one hour duration.
Question asked were
1. Given a very small array and a very big array, how do you find the intersection among them.
Ans. I answered him saying that i will have one hash built on the smaller one and use the bigger array and check if there are intersections.
2. How do you find the first 20 smallest elements in a very big array
Ans. Use some datastructure to sort first 20 elements in the big array, then for each subsequent element, check if it is bigger than the last element, if so, discard it, othersiwe store this and discard the largest
3. Given the arrival times and departure times of flights for past 24 hours, determine how many stair cases you need to serve the aeroplanes.
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For the 2nd problem. I think if you just compare each subsequent array element with the last element of the sorted 20-element array (let's call it A[]), it's very likely that a subsequent element is smaller than not just the last element in A[], in that case, you have to sort A[] each time you encounter an element that's smaller than the last element in order to keep the last element the largest one in A[], so that you can keep comparing subsequent elements with the last element in A[].
I'm thinking maybe we shall build a binary search tree, and then just do inorder tree walk to locate the 20th node in the tree.
Or we do something like QuickSort, we examine the pivot P returned by the partition procedure each time: if the pivot P is greater than 20, we partition the array before the pivot for the 20th element; if the pivot P is less than 20, we partition the array after the pivot for the (20-P)th element.
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Hi There,
Grazie! Grazie! Grazie! Your blog is indeed quite interesting around "Amazon Interview questions"! I agree with you on lot of points!
Since yesterday my EC2 instance in Singapore has become inaccessible to some US customers. Does anyone else have similar problems?
Please keep providing such valuable information.
Cheers,
Preethi.
Hey Brother,
Great post. Well though out. This piece reminds me when I was starting out "Amazon Interview questions" after graduating from college.
I have a VPC Network ACL that allows all inbound and outbound traffic (0.0.0.0/0) through. With Elastic Beanstalk I added an EC2 instance whose security group allows inbound traffic only from my IP address and sends all outbound to 0.0.0.0/0. This works just fine. AWS Training
But great job man, do keep posted with the new updates.
Merci
Ajeeth
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