in an array of input words - delete all anagrams and display only unique words(without anagrams), optimize the solution write code using unordered_map , and what predicate used to find element in unordered_map, (overloaded hash_key() , class::operator( to compare 2 hashed values), or global scope compare function()) provide production level code.

how to find if a window application process is running or hanged? how to detect which thread is hanged? which location is it hanged? - logging? debugging?? task manager? ps/top? windbg? or attach the running process to a debugger and find call trace of all threads?

reason for a process to crash? how to find crash location/cause reason for a process to hang? how to find hanged location/cause

semaphore vs condition variable? - is condition variable internally using mutex/semaphore/auto reset event? mutex vs semaphore ?

design publisher-subscriber code for a multilevel priority queue(m no of priority queues, each Q size is n, and inter queue priority is 0,1,2,3... ) and T no of writer threads and T no of reader threads? how many synchronization objects are required?

cost of thread sleep on the critical section, cost of context switching, the benefit of spinlock? critical section spin locks mechanism.

a process for a particular operation takes 10millisec, after some days it start taking 1 sec? what could be the reason? change in thread priority? , Cpu busy for other tasks? some other required device is responding slow? how to detect which code is causing the problem in currently running system.

design problem using - template method design pattern/ builder / strategy design pattern/ what architectural patterns used - layered, client-server, -----

create a heterogeneous link list, which can contain int, double, Node, Complex, float, any kind of object(we can use templates), no common base class like CObject available?

design an application like OLA CAB draw use case diagram of "a Cab Booking" draw complete system class diagram, relationship - diff payment methods - diff cab types, and their rates - user session/ login( user manager, cab manager, booking system, a booking Order) - the relationship between payment methods and user. - cab driver session/login - active or offline how to manage the list(manage cab driver states-active/offline/onBooking/idle/???) - the cab driver is accepting travel request, or ignoring (how to find and maintain list) - cab is active/ready for ride, how to keep this info in server - (each cab driver device sends some heartbeat signal to server in 1 min or some other way? - push / pull) - what info cab driver device send during heartbeat - time, driver active/passive state/ GPS location ? - if a person hire a cab to go out of bangalore area(out of 30km radius), is it considered active(ready for service) or offline, - once he drops the passenger after 10km out of bangalore(30km+10km), now he is ready to accept the booking, but do we consider him active or offline? - what is the area range we can consider for active or offline - - if cab driver travels to Delhi so can we consider him active or offline? - what if GPS system is showing the wrong location of the driver, or it shows cab is moving, but actually it is not, how to find the error? - if a driver using his own other 20 sims to complete the daily target of 20 rides, and making cash payment only, and getting the bonus for completing rides - how to track this error? - if 20 rides each costing 50/- each(assume) and total earning = 1000(ola will deduct its own share rest is drivers), but ola is giving the additional bonus of 1000/- for completing the target, how to detect this fraud, (all payments are cash payment) - if 4 cabs are available in your 3k radius, how booking happens, in which order, and how to find which can is nearest to you. - find, out of total 50 cabs, 30 is ready for service, how to find the list of active cab drivers, location, polling to accept a ride, distance calculation, cab driver state. - find cab nearest to you(assume the radius of 3 km, find km distance between you and all available cab in this area) - while calculating distance, consider one-way road distance not the straight path between 2 points.