Luxshare Precision Interview Questions and Answers

Q1. Merge intervals ( Leetcode)
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Q2. Buy and sell stocks II (Leetcode)
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Q3. Runtime polymorphism and how it works vptr and vtable
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Runtime polymorphism in C++ is achieved through virtual functions, vptr (virtual pointer), and vtable (virtual table).
• Runtime polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Virtual functions are declared in a base class and overridden in derived classes to achieve polymorphism.

• vptr is a pointer that points to the vtable of an object, allowing dynamic binding of virtual ...read more
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Q4. Which version of c++ you use
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I primarily use C++17, but I am familiar with earlier versions as well.
• I am comfortable working with features introduced in C++17 such as structured bindings and constexpr if

• I have experience with earlier versions like C++11 and C++14

• I stay updated with the latest features and improvements in C++ standards
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Q5. Design patterns
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Q6. Have you used any windows api's?
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Yes, I have used Windows API's extensively in my previous projects.
• I have used Windows API's for tasks such as creating windows, handling messages, and interacting with system resources.

• Examples include using functions like CreateWindow, SendMessage, and ReadFile.

• I have also worked with specific Windows API's like Winsock for networking and WinINet for internet-related tasks.
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Q1. One debugging question was given which will test knowledge on copy constructor, copy assignment, their return type move constructor, move assignment shallow copy, deep copy runtime polymorphism pointer ini...read more
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Q2. What is dynamic_cast where it can fail and what will happen in that case
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dynamic_cast is a C++ operator used for safe downcasting of pointers and references in polymorphic classes.
• dynamic_cast is used to safely downcast a pointer or reference from a base class to a derived class.

• It can fail if the object being casted is not of the target type, in which case it returns a null pointer for pointers or throws a std::bad_cast exception for references.

• Dynamic_cast can only be used with pointers o...read more
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Q1. Same debugging question while making it advance how will you handle in case there is data member of pointer to int array in deep copy how will you ensure that it does delete previous data in case new opera...read more
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Q2. What is union in c++
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Union in C++ is a data structure that allows storing different data types in the same memory location.
• Unions are similar to structures but all members share the same memory location.

• Only one member of a union can be accessed at a time.

• Unions are useful when you need to store different data types in the same memory space.

• Example: union MyUnion { int i; float f; };

• Example: MyUnion u; u.i = 10; // Accessing integer member
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Q3. What is weak pointer
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Weak pointer is a type of smart pointer in C++ that does not control the lifetime of the object it points to.
• Weak pointers are used to break circular references in shared pointers.

• They do not increase the reference count of the object.

• They are used in scenarios where the object may be deleted while there are still weak pointers pointing to it.
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Q4. What are processes and threads memory is allocated to what process or threads? what is mutex and semaphore how many threads/process can you launch at a time what is meaning of core in 4-core system what is...read more
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Processes and threads are units of execution in a computer system. Memory is allocated to processes. Mutex and semaphore are synchronization mechanisms. Core refers to a processing unit in a multi-core system. Context switching is the process of switching between different processes or threads.
• Processes are independent units of execution with their own memory space and resources.

• Threads are lightweight units of executi...read more
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Q5. What is this pointer tell me situation where only this pointer can be used nothing else will work
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Q1. Implement nand gate using 2:1 mux
Ans. 
NAND gate can be implemented using a 2:1 multiplexer by connecting one input to select line and the other input to one of the data inputs.
• Connect one input of the NAND gate to the select line of the 2:1 mux.

• Connect the other input of the NAND gate to one of the data inputs of the 2:1 mux.

• Connect the other data input of the 2:1 mux to ground.

• The output of the 2:1 mux will be the output of the NAND gate.
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Q2. Implement a 4:1 mux using 2:1 mux
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A 4:1 mux can be implemented using two 2:1 muxes by selecting one of the 2:1 muxes based on the select line.
• Use one 2:1 mux to select between the two inputs of the second 2:1 mux based on the select line

• Connect the outputs of the two 2:1 muxes to get the final 4:1 mux output
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Q3. Implement a 58:1 mux using 2:1 mux and how many mux are required?
Ans. 
A 58:1 mux can be implemented using 2:1 mux by cascading multiple levels of muxes.
• Implement a 2:1 mux using 2 input lines and 1 output line.

• Cascading multiple levels of 2:1 muxes can create a 4:1, 8:1, 16:1, and finally a 58:1 mux.

• In this case, you would need 6 levels of 2:1 muxes to create a 58:1 mux.
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Q4. Projects in the resume
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Q1. What is Planning?
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Planning is the process of setting goals, determining actions to achieve those goals, and allocating resources effectively.
• Setting specific, measurable, achievable, relevant, and time-bound (SMART) goals

• Creating a detailed plan of action to achieve the goals

• Allocating resources such as time, money, and manpower efficiently

• Monitoring progress and making adjustments as needed

• Examples: Financial planning for a company's b...read more
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Q2. What to build financial model?
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A financial model is built to forecast future financial performance of a company or project.
• Identify the purpose of the financial model (e.g. budgeting, valuation, forecasting)

• Gather historical financial data and relevant assumptions

• Create income statement, balance sheet, and cash flow statement projections

• Perform sensitivity analysis to assess the impact of different variables

• Validate the model by comparing actual res
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Q1. What is depreciation?
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Depreciation is the allocation of the cost of a tangible asset over its useful life.
• Depreciation is a non-cash expense that reduces the value of an asset over time.

• It reflects the wear and tear, obsolescence, or decrease in value of an asset.

• Common methods of calculating depreciation include straight-line, double declining balance, and units of production.

• Example: A company purchases a machine for $10,000 with a useful...read more
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Q2. What is the concept of budgeting?
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Budgeting is the process of creating a plan to manage income and expenses over a specific period of time.
• Budgeting involves setting financial goals and creating a detailed plan to achieve them.

• It helps in tracking income, expenses, and savings to ensure financial stability.

• Budgeting can be done on a personal level, for businesses, or for specific projects.

• Examples of budgeting tools include spreadsheets, budgeting apps
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Q1. Why you are leaving the company that you are working in ?
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Seeking new challenges and growth opportunities in a different environment.
• Looking for new challenges and opportunities for growth

• Interested in exploring different technologies and industries

• Seeking a better work-life balance

• Want to work in a more collaborative team environment
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Q2. Tel me about project that you lead
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Led a project to develop a mobile application for tracking fitness goals
• Managed a team of 10 developers and designers

• Defined project scope, timeline, and deliverables

• Implemented Agile methodology for project management

• Collaborated with stakeholders to gather requirements and feedback

• Successfully launched the app on both iOS and Android platforms
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Q3. How many people you are managing
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I am currently managing a team of 10 software developers.
• I oversee a team of 10 software developers

• I am responsible for managing the day-to-day activities of the team

• I provide guidance and support to team members to ensure project success
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Q4. Salary expectations
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Q5. Large scale products
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Q6. Leet code , given a trangle with 2 colors , you need to find the line that separate the two colors
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Given a triangle with 2 colors, find the line that separates the two colors.
• Iterate through each row of the triangle

• Check for adjacent colors in each row to find the separating line

• Return the row number where the colors change
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Q1. Toggle the bits of given input
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Toggle the bits of given input
• Create a mask with all bits set to 1

• XOR the input with the mask to toggle the bits

• Repeat the process for each bit position
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Q2. Clear the set bit
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Q1. Print the star pattern
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Print a star pattern using loops
• Use nested loops to print the desired pattern

• Increment the number of stars in each row to create the pattern

• Example: for a pattern with 5 rows - * , ** , *** , **** , *****
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Q2. Microprocessor microcontroller topics are asked
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1 hour
aptitude test
brain teaser type questions

Q1. What is transistor?
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Q2. What is BJT? where it is used?
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Q1. Whatis the TDS rate
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TDS rate refers to the percentage of tax deducted at source on various incomes such as salary, interest, rent, etc.
• TDS rates vary depending on the type of income and the recipient's status

• For example, TDS rate on salary income can range from 5% to 30% based on the income slab

• TDS rate on interest income is usually 10% but can vary for different types of interest

• TDS rate on rent income is typically 10% for individuals an
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Q2. What is the joner entry of sale receive
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The journal entry for sale received involves debiting the cash or accounts receivable account and crediting the sales revenue account.
• Debit the cash or accounts receivable account to reflect the increase in assets

• Credit the sales revenue account to record the revenue earned from the sale

• Ensure the journal entry follows the double-entry accounting system

• Example: Debit Cash $1,000, Credit Sales Revenue $1,000
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Q1. What is the current liabilities
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Current liabilities are debts or obligations that are due within one year.
• Current liabilities are typically found on the balance sheet and include items such as accounts payable, short-term loans, and accrued expenses.

• They represent the company's obligations that must be settled within a year.

• Examples of current liabilities include salaries payable, income taxes payable, and short-term borrowings.

• Monitoring current lia...read more
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Q2. What is meaing of assets
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Assets are resources owned by a company that have economic value and can be used to generate future revenue.
• Assets are resources owned by a company

• They have economic value

• Assets can be used to generate future revenue

• Examples include cash, inventory, equipment, and investments
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It is an interesting i improve my knowledge and than lot of experience in interview

Q1. Teel me your self
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Q2. What is your streanth
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