NEC SDE (Software Development Engineer) Interview Questions and Answers

Q1. 1. Check if the linked list is circular or linear?
Ans. 
To check if a linked list is circular or linear, we need to traverse the list and check if it loops back to a previous node.
• Traverse the linked list using two pointers, one moving one node at a time and the other moving two nodes at a time.

• If the faster pointer catches up to the slower pointer, then the list is circular.

• If the faster pointer reaches the end of the list without catching up to the slower pointer, then th...read more
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Q2. 2. Check how many bits are set in a number?
Ans. 
Count the number of set bits in a given number.
• Use bitwise AND operator with 1 to check if the rightmost bit is set.

• Shift the number to right by 1 bit and repeat the process until the number becomes 0.

• Keep a count of the number of set bits encountered.

• Example: For number 5 (101 in binary), the answer is 2 as there are 2 set bits.

• Example: For number 15 (1111 in binary), the answer is 4 as there are 4 set bits.
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Q3. 3. what is a segmentation fault?
Ans. 
Segmentation fault is a type of error caused by accessing memory that “does not belong to you.”
• It occurs when a program tries to access a memory location that it is not allowed to access.

• It is often caused by programming errors such as accessing an array beyond its bounds.

• It can also be caused by hardware problems such as faulty RAM or overheating.

• Segmentation faults can be difficult to debug because they often occur i...read more
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Q1. All java and spring boot related Questions like interface, streams, qualifier, profile
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Q2. Char count using streams
Ans. 
Counting characters using streams in Java
• Use the chars() method to convert the string to an IntStream of characters

• Use the count() method to count the number of characters in the stream
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Mathematic

Q1. What are your strengths and weaknesses?
Ans. 
My strengths include problem-solving, attention to detail, and teamwork. My weaknesses include time management and public speaking.
• Strengths: problem-solving, attention to detail, teamwork

• Weaknesses: time management, public speaking
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Q2. Tell me about yourself.
Ans. 
I am a software developer with experience in various programming languages and a passion for creating innovative solutions.
• Experienced in Java, C++, and Python

• Developed a mobile app using React Native

• Worked on a team to build a web application using AngularJS

• Strong problem-solving and analytical skills
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Round duration - 30 Minutes
Round difficulty - Medium

Q1. 
Count Ways to Reach the N-th Stair Problem Statement
You are provided with a number of stairs, and initially, you are located at the 0th stair. You need to reach the Nth stair, and you can climb one or tw...read more
Ans. 
The problem involves counting the number of distinct ways to climb N stairs by taking 1 or 2 steps at a time.
• Use dynamic programming to solve the problem efficiently.

• The number of ways to reach the Nth stair is equal to the sum of ways to reach (N-1)th stair and (N-2)th stair.

• Handle base cases for N=0 and N=1 separately.

• Consider using modulo operation to avoid overflow for large values of N.
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Round duration - 15 Minutes
Round difficulty - Easy