Theory video for this video?

Hi sir,
here in video sir is talking about some theoritical video
to watch before, but i am not able to find that,
as previous videos are related to other topic of array
correct me if i am wrong

actually i am not getting what this lower and upper bound is?

@career.hemsagar,
I am not sure about which theoretical video. For that please drop a mail to [email protected]

Lower and Upper Bound:

Find position of the last and first occurrence of a given number in a sorted array. If number does not exist then print lower and upper bound as -1.