Soting doubt sorting doubt

#1

Let’s say there are 5 elements in array (a is our array) and i want to start sorting from 1st index. Then the arguments i have to pass are (a+1, a+n) or (a+1, a+n-1)???
Please explain it in detail why we using that argument and not the other one.

#2

sort(a+1,a+n)
first argument is starting address and second argument is ending address

Sorts the elements in the range [first,last) into ascending order
last not included

see the definition of sort function

template <class RandomAccessIterator>
  void sort (RandomAccessIterator first, RandomAccessIterator last);

Sorts the elements in the range [first,last) into ascending order.
#3

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