i have seen in many problems that we sometimes thake i-j
and sometimes is i-j-1 here too sir has taken mid-(i-1) like whats the intution can you please help me like when to take which
Confusion with a statement
it may be something because of using 1 based index or 0 based index
in order to come forth such problem try a dry run on pen and paper and check which works for u
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