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Senior member of technical staff Interview Questions


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given 8 coins and one of them heavier than the others, how many weighings will be needed to find the odd one ?

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two weighings are needed. separate into three groups (3,3,2) put three on each side of scale, if sides balance then place two remaining coins on either side of scale to see which is heavier. If sides don't balance, take two coins from the heavier side and put on the scale to see if one is heavier, if they balance, the one you took off is the heaviest.

One weighing. Place four coins in each pan. Take two off at a time until the scale balances. The heavier coin will be in the hand of the pan that ascends.

@Cigar lover ... no. once you put coins on the scale, that counts as a weighing, and every time you remove coins it counts as a weighing. this boils down to the 3-3-2 solution above. the first time you remove 2 and weight, you are weighing 3-3. at that point there are 3 possibilities still. the scale is even, or one or the other side is down. you have to do one more weighing from there.

If we write return statement in try, catch and finally block, which one will execute when and why ?

4 Answers

Explain overall polymorphism using uml diagram?

2 Answers

Why Mirafra ?

1 Answer

Find the 2 largest number from an unsorted array

1 Answer

basic java.j2ee question

1 Answer

Telephonic: Given a binary tree of numbers and a search number has given, find out first occurence of that number and smallest distance from root node. if you have given k search numbers find their occurence and nearest from root node in a single walk.

2 Answers

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Very Easy like eating popcorn

1 Answer

Do you know node JS

1 Answer

Interview was on data structures, algorithms, OOPs concepts, Designing. One design question was, designing an elevator in a skyscraper - finding use cases and identifying the patterns and writing the class diagram and relations, failure modes and analysis.