|     |   Technical Questions
Organization : DirectI
Position : Software Developer
My technical Interview questions consists primary of three sections:
1. Program/Algorithm
2. Theoretical
3. Sql

Program/Algorithm Interview Questions
1. Write a recursive function reverseString(string str) that reverses an input string.
Where 'str' is the string to be reversed.

2. Write a function that will find all numbers which appears only once in an array of duplicates.

3. Recursive function to calculate factorial of an number.

4. Write a program to reverse a doubly linked list with/without using extra memory.

5. Sort an array based on frequency of numbers.

Theoretical Interview Questions
1. Which one is quicker and why?
A) Array

2. How is mutex different from semaphore

3. Complexity of some sorting algos like quick,merge,hash...

Sql Interview Questions
1. Queries on joins(self join + left join)
2. Normalization concept and i was asked to normalize a table.

Thanks Anmol for sharing the details of your interview.
Send more details and your personal experiences info@gpuzzles.com
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How many candles were left in the end?

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# Lateral Thinking Problem

Suppose there is a Christmas tree and four angels are sitting on it amidst the other ornaments. Two of them have black halos and two of them have white halos. No body among them can see above their head. Angel A is sitting on the top branch and can see angels B and C sitting below him. B can see C who is sitting in a branch lower than his. Angel D is at the base of the tree and can't be seen due to the branches in between. Also, he can't see anybody as well.

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David and Albert are playing a game. There are digits from 1 to 9. The catch is that each one of them has to cut one digit and add it to his respective sum. The one who is able to obtain a sum of exact 15 will win the game?

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Your task is to then determine which switch controls the bulb ??

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