Droom Software Developer Intern Interview Questions and Answers for Freshers

Q1. System Design questions
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Q2. SQL theory & pgm questions
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Q3. Python programs
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Q4. Normalization Pgms
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Q1. Oops Inheritance and Incapsulation
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Q1. Sql join questions
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Q2. Python decorartors
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Q1. Design Questions to build a scalable micro service
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Q2. Salary Discussion
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Easy to medium, can solve with leetcode medium

Q1. Number of islands count
Ans. 
Count the number of islands in a grid of '1's and '0's
• Iterate through the grid and for each '1' encountered, perform a depth-first search to mark all connected '1's as visited

• Increment the island count for each new island found

• Ensure to handle boundary cases and check for visited nodes
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Q2. First and last index of a particular element in an array
Ans. 
Find the first and last index of a specific element in an array of strings.
• Iterate through the array and keep track of the index of the first and last occurrence of the element.

• Return the first and last index once the iteration is complete.

• Example: Array ['apple', 'banana', 'apple', 'orange'], element 'apple' - First index: 0, Last index: 2.
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Computer Fundamentals

Q1. Flatten a binary tree
Ans. 
Flatten a binary tree by converting it into a linked list in-place.
• Use a recursive approach to flatten the binary tree.

• Traverse the tree in a pre-order manner and keep track of the previous node.

• Set the left child of each node to null and the right child to the next node in the linked list.

• Example: Input: 1 -> 2 -> 5 -> 3 -> 4 -> null, Output: 1 -> null -> 2 -> null -> 3 -> null -> 4 -> null -> 5 -> null
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Leecode medium level question

Leetcode Hard level Question

Q1. This is cto round asked some interview questions
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Q1. Questions were mostly around motivation
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Q2. What is the long term vision for the career?
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Q3. Why do you want to work in a startup?
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Given a coding assignment to build the backend of an application.