ION Group SDE Interview Questions and Answers

Use a hash table to store phone numbers alongside names for quick lookups.

• Use a hash table where the keys are the phone numbers and the values are the corresponding names.

• This allows for constant time lookups of names based on phone numbers.

• Example: {"555-1234": "John Doe", "555-5678": "Jane Smith"}

OOPs stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

A trie is a tree data structure used for storing a dynamic set of strings.

• Trie stands for retrieval tree or prefix tree

• Each node in a trie represents a single character

• Tries are commonly used in autocomplete features and spell checkers

Snake and ladder is a classic board game where players move their tokens based on the outcome of a dice roll.

• Players take turns rolling a dice and moving their token along the board.

• If a player lands on a ladder, they move up to a higher-numbered square.

• If a player lands on a snake, they move down to a lower-numbered square.

• The first player to reach the final square wins the game.

The puzzle problem of GFG involves solving a challenging puzzle on GeeksforGeeks.

• Read the problem statement carefully and understand the requirements.

• Break down the problem into smaller subproblems if possible.

• Try different approaches and algorithms to solve the puzzle.

• Test your solution with different test cases to ensure correctness.

• Optimize your solution if possible to improve efficiency.