It will help apps which require interaction from users, like google stadia's game streaming. for other use cases, I think one does not care even if the feed is delayed by few seconds.
Another interesting use case someone mentioned here before is the world cup - you don't want a penalty shoot-out ruined by your neighbours cheering a few seconds before you see the goal.
A few seconds would also such for live streaming where the streamer interacts in chat.
I could not get this logic. Can you explain more? problem would have been, if he got that money before demonetization, or he would have bought lands/gold, even then , if money comes in bank, "blackness" goes away, no?
Just few days before demo, huge huge amounts of cash was deposited in his managed loxal bank, & when demo was declared, as that money was already in bank's vault, it was safe. Also, the bank was type of Co-operative, kind of local credit union, these types of banks does not need to be interconnected between branches or with a central place, neither do they need to keep digitally timestamped records, manual book keeping on paper is allowed.
If you are just asking Algo and probably pseudo code, these questions might help, but if you ask to write the proper code with boundary conditions etc, that makes it difficult even if you know the Algo. Of course I am assuming that no one memorizes the code ;).
I used to give people a description of how an algorithm was implemented, and ask them to write it out in code. Specifically we'd take the conversation to boundary conditions, failure conditions, testing, etc, from there. I was reasonably happy with the outcome.
