Amitava, can you please be a little more specific than "mentioned earlier"? Remember, you can put links into your description with notation.
corrected. thanks, Ned.
Find the sum of the elements in the "second" diagonal
Use of regexp
Decode a simplified barcode
Find nearest prime number less than input number
Filter AC, pass DC
Given a square and a circle, please decide whether the square covers more area.
Acidity of vinegar and salts
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