Why didn't we use lower_case stl instead of creating this function for first occurrence?

#1

Previously we studied about the stl lower_bound and upper_bound for the same function. So do we do need this?
Is it more efficient?

#2

You can use any method to find the occurances. But if you create a user defined function then you can consider multiple cases as well . In terms of time both works same

#3

Multiple cases as in?

#4

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