Amitava, it is fantastic that you are contributing problems, but you really need to spend more time specifying what the solution should do. The person solving is left needing to guess too much.
Definitely Agree with the cyclist. W/o example it is impossible to understand the task to achieve.
The DC component of a signal is usually its mean. Now filter can have many meanings, but in this case, it means to remove the signal variation.
Test for balanced parentheses
Distance walked 2D
Energy of a photon
Find the dimensions of a matrix
How to multiply?
Given a number N, find the smallest prime P>N
peta to nano (x-ray)
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