Ontash Technologies DOT NET Developer Interview Questions and Answers

Q1. 2 sum in array
Ans. 
The Two Sum problem involves finding two numbers in an array that add up to a given target value.
• Iterate through the array and store the difference between the target and current element in a hashmap

• Check if the current element exists in the hashmap, if yes return the indices

• Time complexity can be reduced to O(n) using a hashmap
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Q2. Reverse a linked list
Ans. 
Reverse a singly linked list and return the reversed list.
• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the list.

• Update the head of the list to be the last node after reversing.
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Q3. In given time slots , find conflicting time slots
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Q1. Asked about projects
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Q2. Longest palindrome
Ans. 
Find the longest palindromic substring in a given string.
• Iterate through each character in the string and expand around it to find palindromes

• Use dynamic programming to optimize the solution

• Consider both odd and even length palindromes
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Give you 5 problem in maths , string, sql etc

Coding test duration is 30 to 40 min
on paper pen and topic is simple like related to string,pattern and number's

Q1. Introduction about yourself
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Q2. Salary expectation
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Q1. Related to the basic of html css and js
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Q2. Ask run time short code and explanation
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Q1. About yourself and other
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Q2. All about company your expectation and salary disscuced
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Q1. Strecture of sql statement
Ans. 
SQL statements are used to interact with databases by performing operations like querying, updating, and deleting data.
• SQL statements are made up of keywords like SELECT, INSERT, UPDATE, DELETE, etc.

• They are structured in a specific order, with clauses like WHERE, ORDER BY, GROUP BY, etc.

• Tables are referenced using their names, and conditions are specified to filter data.

• Joins can be used to combine data from multiple
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Data Structures and Algorithms

Q1. Data Structures
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Q2. System design questions
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Good level question. I have qualified for the next round

Basic to intermediate question, Cleared the test

Q1. Tell me about yourself and introduce yourself
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30 mintues, relationship topics

Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Why should we hire you?
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Q4. What are your strengths and weaknesses?
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Q5. Tell me about yourself.
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Q1. They asked about OPS, Data design and coding pattern
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Q2. About my coding pattern
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