Not able to code the lexicography part

#1

My code:- https://ide.codingblocks.com/s/660394
I have coded the part for sub-sequences, but i am not able to write the lexicography part.
Pls help in out.

#2

here’s the corrected code (commented)

@ayushkotwar2002_78a27ac2b05189a5

#3

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