Interview Questions and Answers for 'C' | Search Interview Question

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Q1951. Given a linked list with 0 to n node references , Flaten the Linked list

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Q1952. Find out the max and min number from given array

Core Java

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Q1953. Math.round method rounds the decimal to an integer by stripping off the decimal places. How can we use the same method to keep only 2 decimal places

For example -

Math.round(12.3456) will return 12. What should we do to get 12.34 without using any other class or method.

Core Java

Ans. We can multiply the value by 100 and then use Math.round on that and then divide the result by 100

For example -

(Math.round(12.3456 * 100)) / 100

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Q1954. What is the difference between round and scale method of BigDecimal ?

Core Java

Ans. Round method would round it to integer places irrespective of if it's decimal places or not whereas scale would only round the decimal places.

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Q1955. Given a comma separated string that signifies the current position in 4 * 4 tic tac toes game, write a program that gives the result of the game - If anyone win and if yes then who and if the game is still open.

For example - x,0,x,x,x,0,0,0,0,x,0,x means that 00 index has x, 01 has 0 and so on with x(3,3) has last element x

Design

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Q1956. If a stack is implemented using an array, which end (head or tail) should represent the top ?

Data Structure

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Q1957. If a stack is implemented using linkedlist, which end (head or tail) should represent the top ?

Data Structure

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Q1958. Describe how a queue is usually created using sequential allocation.

Data Structure

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Q1959. What is the "multiplicative congruence" method for determining where an element belongs in a hash table ?

Data Structure

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Q1960. Which of the Core Java functions / packages / concept do you believe have become irrelevant in today's market ?

Core Java

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Q1961. What are you using AWS lambda for ?

Amazon Web Services (AWS)

Ans. We are using it for computation (EC2) , Storage (S3) and Database (RDS)

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Q1962. What methodology and technology stack do you use ?

General

Ans. [Open Ended Answer]

Possible Answer - We are using Agile. We have daily standups, Bi weekly Backlog Grooming , Planning and Retrospective, We have a 2 week sprint and We use Jira for Scrum Management. We are using Java 8, Spring Boot, JSF , Apache Kafka , Soap as well as Rest Services.

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Q1963. Why you chose programming as your career ?

General

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Q1964. Explain your experience working on UI ?

General

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Q1965. Have you worked with JSF ?

General

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Q1966. How long will it take for you to join Canopy ?

General

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Q1967. What is the Big O notation for Fibonacci series - both iterative as well as recursive ?

Algorithm

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Q1968. Write code to see if a Linked List has cycle in it ?

or

Write code using Floyd Algorithm to see if a linked list has cycle in it ? What is it's comlexity ?

Algorithm

Ans. public class LinkedList {

Node start = null;
Node head = null;

class Node {
Integer body;
Node nextNode;

Node(Integer value) {
body = value;
}
}

public static void main(String[] args) {
LinkedList ll = new LinkedList();

ll.addNodeToEnd(5);
ll.addNodeToEnd(10);
ll.addNodeToEnd(15);

ll.traverse();

if(checkIfLoop(l1)){
System.out.println("There is a Loop");
} else {
System.out.println("No Loop");
}
}

private boolean checkifLoop(Test l1) {
Node slow = start;
Node fast = start;
Node faster = start;

while(slow != null ) {
fast = slow.nextNode;
faster = fast.nextNode;
if(slow == fast || slow == faster) {
return true;
}
slow = slow.nextNode;
}

return false;
}

}

Complexity of this algorithm is O(n)

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Q1969. What is the access time for ArrayList and LinkedList ?

Data Structure

Ans. O(1) for ArrayList
O(n) for LinkedList

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Q1970. Write a method that returns maximum depth of a tree ?

Algorithm

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Q1971. Difference between Left and Inner Join ?

SQL

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Q1972. Write a method that takes a string as input and identifies if any permutation of the String is Palindrome ? For example - ttoobb has a permutation 'bottob' which is a palindrome.

Design

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Q1973. Given a list of People, We need to distribute their gifts in such a way that

Any Person shouldn't get it's gift back
If A's gift goes to B, B's gift shouldn't go to A

Write a method that returns a Map where Key is the Person's name and value is the name of person whose gift was exchanged.

Design

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Q1974. Which data structure would you use to implement LRU cache and Why ? Can you tell me the time complexity for it ?

Algorithm

Ans. We can use LinkedHashMap as it will give time complexity of O(1) for lookup and We can maintain the insertion order to identify the Last used elements for eviction.

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Q1975. What are Ractive Streams ?

ReactiveX

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Q1976. Have you heard of reactive extensions ?

ReactiveX

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Q1977. What are the drawbacks of Reactive extensions ?

ReactiveX

Ans. Reactive extensions have a steep learning curve which makes it confusing for beginner and intermediate developers.

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Q1978. What can we do if we need to retrieve Fibonacci value at a particular index faster ? Can we use Linked List ?

Data Structure

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Q1979. Sort a List of Objects using comparable and comparator

Core Java

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Q1980. What is synchronization in multithreading ?

Ans. When we start two or more threads within a program, there may be a situation when multiple threads try to access the same resource and finally they can produce unforeseen result due to concurrency issues.

For example, if multiple threads try to write within a same file then they may corrupt the data because one of the threads can override data or while one thread is opening the same file at the same time another thread might be closing the same file.

So there is a need to synchronize the action of multiple threads and make sure that only one thread can access the resource at a given point in time. This is implemented using a concept called monitors. Each object in Java is associated with a monitor, which a thread can lock or unlock. Only one thread at a time may hold a lock on a monitor."

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