Algorithm - Interview Questions and Answers for 'Binary search' | Search Interview Question

Algorithm - Interview Questions and Answers for 'Binary search' - 7 question(s) found - Order By Rating

Q1. What are the disadvantages of binary search trees?

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Q2. Explain Binary Search

Algorithm

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Q3. How Cassandra provides better Read performance than Oracle Indices ?

Database

Ans. Cassandra uses Hash Search which provides a look time of O(1) whereas Oracle Indices uses Binary Search that provide a lookup time of O(Log n).

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Frequently asked to Fresh graduates.

Q4. Write a program to implement Binary search ?

Core Java

Ans. http://algs4.cs.princeton.edu/11model/BinarySearch.java.html

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Q5. Can we use Ordered Set for performing Binary Search ?

Ans. We need to access values on the basis of an index in Binary search which is not possible with Sets.

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Q6. What are the pre-requisite for the collection to perform Binary Search ?

Ans. 1. Collection should have an index for random access.
2. Collection should have ordered elements.

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Advanced level question frequently asked in US based companies. Recently asked in EMC and Intuit.

Q7. Can you provide some implementation of a Dictionary having large number of words ?

Solution

Ans. Simplest implementation we can have is a List wherein we can place ordered words and hence can perform Binary Search.

Other implementation with better search performance is to use HashMap with key as first character of the word and value as a LinkedList.

Further level up, we can have linked Hashmaps like ,

hashmap {
a ( key ) -> hashmap (key-aa , value (hashmap(key-aaa,value)
b ( key ) -> hashmap (key-ba , value (hashmap(key-baa,value)
....................................................................................
z( key ) -> hashmap (key-za , value (hashmap(key-zaa,value)
}

upto n levels ( where n is the average size of the word in dictionary.

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Q8. Binary Search requires that the collection should be Reference

Algorithm

a. Sorted in Ascending Order

b. Sorted in Descending Order

c. Sorted in any Order

d. Unsorted

Ans.c. Sorted in any Order

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