Lower and bound question

#1


i am unable to find mistake in my code, what should be changes in this one?

#2

if element not found then lower_bound and upper_bound doesn’t return last index

The lower_bound() method in C++ is used to return an iterator pointing to the first element in the range [first, last) which has a value not less than val. This means that the function returns the index of the next smallest number just greater than or equal to that number.

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hence your condition is wrong

if(lb-a==n ){

            cout<<-1<<" "<<-1<<endl;

        }

i have done some changes to your code

Modified Code

#3

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