10+ Khanco Interview Questions and Answers

Count and return the total number of pairs in the array whose elements add up to a given sum.

• Use a hashmap to store the frequency of each element in the array.

• Iterate through the array and for each element, check if (Sum - current element) exists in the hashmap.

• Increment the count of pairs if the complement exists in the hashmap.

The problem involves finding the minimum number of jumps required to reach the last index of an array, where each element indicates the maximum distance that can be jumped from that position.

• Use a greedy approach to keep track of the farthest reachable index and the current end of the jump.

• Iterate through the array, updating the farthest reachable index and incrementing the jump count when necessary.

• Return the jump count as the minimum number of jumps needed to reach the last...read more

Check if a given undirected graph can be divided into exactly two disjoint cliques.

• Create an adjacency list to represent the graph

• Use BFS or DFS to check if the graph is bipartite

• If the graph is bipartite, it can be divided into two disjoint cliques

Find the length of the longest pair chain that can be formed using the provided pairs.

• Sort the pairs based on the second number in each pair.

• Iterate through the sorted pairs and keep track of the maximum chain length.

• Update the maximum chain length based on the conditions given in the problem statement.

Diamond Problem is a common issue in multiple inheritance in C++ where a class inherits from two classes that have a common base class.

• Diamond Problem occurs when a class inherits from two classes that have a common base class, leading to ambiguity in accessing members.

• It can be resolved in C++ using virtual inheritance, where the common base class is inherited virtually to avoid duplicate copies of base class members.

• Example: class A is inherited by classes B and C, and then...read more

Data abstraction is the process of hiding implementation details and showing only the necessary features of an object.

• Data abstraction can be achieved through classes and objects in object-oriented programming.

• It involves creating a class with private data members and public methods to access and modify those data members.

• By using data abstraction, users can interact with objects without needing to know the internal workings of the object.

• For example, a car object may have me...read more

Multitasking involves running multiple tasks concurrently, while multithreading allows multiple threads within a single process to run concurrently.

• Multitasking allows multiple processes to run concurrently on a single processor, switching between them quickly.

• Multithreading allows multiple threads within a single process to run concurrently, sharing resources like memory and CPU time.

• Multitasking is at the process level, while multithreading is at the thread level.

• Example: A...read more

Design a system like Pastebin for sharing text snippets

• Use a web application framework like Django or Flask for the backend

• Store text snippets in a database like MySQL or MongoDB

• Generate unique URLs for each snippet to share with others

• Implement features like syntax highlighting, expiration time, and password protection

• Consider implementing user accounts for managing and organizing snippets

TCP/IP is a set of rules governing the exchange of data over the internet.

• TCP/IP stands for Transmission Control Protocol/Internet Protocol.

• It is a suite of communication protocols used to connect devices on the internet.

• TCP ensures that data is delivered reliably and in order, while IP handles the addressing and routing of data packets.

• Examples of TCP/IP applications include web browsing (HTTP), email (SMTP), and file transfer (FTP).

Friend functions in C++ are functions that are not members of a class but have access to its private and protected members.

• Friend functions are declared inside a class with the keyword 'friend'.

• They can access private and protected members of the class they are friends with.

• Friend functions are not member functions of the class.

• They can be standalone functions or functions of another class.

• Example: friend void displayDetails(Student);