GeeksForGeeks Interview Questions, Process, and Tips

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Q1. Basic question related to mathematics
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3 Coding Question were there
Easy - 2 Pointer Problem Variation
Medium - Prefix Sum Problem Variation
Hard - DP (Maximum of Minimum) Variation Problem

Q1. Difference between SQL and NoSQL
Ans. 
SQL is a relational database management system while NoSQL is a non-relational database management system.
• SQL databases use structured query language while NoSQL databases use unstructured query language.

• SQL databases are vertically scalable while NoSQL databases are horizontally scalable.

• SQL databases are good for complex queries while NoSQL databases are good for large amounts of unstructured data.

• Examples of SQL dat...read more
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Q2. Different types of Indexing in SQL
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Different types of indexing in SQL
• Clustered Index

• Non-Clustered Index

• Unique Index

• Full-Text Index

• Filtered Index
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Q3. Joins question and query on that
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Q4. Schema Design of Restaurant Management System(RMS)
Ans. 
Schema design for a Restaurant Management System
• Identify entities such as customers, orders, menu items, tables, etc.

• Create tables for each entity with appropriate attributes and relationships

• Use foreign keys to establish relationships between tables

• Consider normalization to avoid data redundancy and improve performance

• Include constraints to ensure data integrity

• Use appropriate data types for each attribute

• Consider sca
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Q1. What is complexity and their types
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Complexity refers to the level of difficulty in solving a problem. There are two types: time complexity and space complexity.
• Time complexity refers to the amount of time required to solve a problem, and is usually measured in terms of the number of operations performed by an algorithm.

• Space complexity refers to the amount of memory required to solve a problem, and is usually measured in terms of the amount of memory us...read more
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Q2. Detect a loop in a linked list and return the node where the loop starts.
Ans. 
Detect loop in linked list and return node where loop starts.
• Use two pointers, one moving one node at a time and the other moving two nodes at a time

• If there is a loop, the two pointers will eventually meet at a node inside the loop

• Reset one of the pointers to the head of the linked list and move both pointers one node at a time

• The node where the two pointers meet is the start of the loop
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Q3. Different types of traversal
Ans. 
Traversal refers to visiting all the nodes of a data structure in a specific order.
• Inorder traversal: Left subtree, root, right subtree

• Preorder traversal: Root, left subtree, right subtree

• Postorder traversal: Left subtree, right subtree, root

• Level order traversal: Visit nodes level by level
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Q4. Find the sum of pairs in the binary search tree which is equal to k
Ans. 
Find the sum of pairs in a binary search tree equal to k.
• Traverse the tree in-order and store the values in an array.

• Use two pointers approach to find the pairs that sum up to k.

• Time complexity: O(n), Space complexity: O(n).
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Q1. Discussion on the project.
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Q2. Design a payment gateway.
Ans. 
A payment gateway is a software application that facilitates online transactions between a merchant and a customer.
• The payment gateway should support multiple payment methods such as credit/debit cards, net banking, and digital wallets.

• It should have a secure and reliable infrastructure to ensure the safety of customer data.

• The gateway should have a user-friendly interface for easy navigation and payment processing.

• It ...read more
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Q3. Populate next right pointer
Ans. 
Populate the next right pointer of a binary tree node
• Traverse the tree using level order traversal

• For each node, set its next right pointer to the next node in the same level

• If there is no next node in the same level, set the next right pointer to NULL
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Q1. Question related to Dijkstra Algorithm was asked.
Ans. Dijktra algorithm is a graph algorithm to find shortest distance between two graph nodes if exist a path between them.
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Q2. Case where Dijkstra will not work
Ans. 
Dijkstra's algorithm will not work when there are negative edge weights in the graph.
• Dijkstra's algorithm assumes that all edge weights are non-negative.

• If there are negative edge weights, the algorithm may produce incorrect shortest paths.

• In such cases, other algorithms like Bellman-Ford or Floyd-Warshall should be used.

• For example, consider a graph with a negative weight cycle.
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Q3. What is sparse table and why it is used
Ans. 
Sparse table is a data structure used to efficiently answer range queries on an array.
• Sparse table is used to optimize range query operations on an array.

• It precomputes and stores the answers to all possible range queries in a table.

• The table is constructed using a divide-and-conquer approach.

• Sparse table reduces the time complexity of range queries from O(n) to O(1).

• It is commonly used in scenarios where range queries
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