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From: Andreas Leitgeb <avl@logic.at>
Newsgroups: comp.lang.java.programmer
Subject: Re: how do you determine whether to start at 0 or 1 ?
Date: Thu, 3 Nov 2022 17:49:04 -0000 (UTC)
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karen goh <contact@hi5tutors.com> wrote:
> Hi,
> I have problem in determining to start at 0 or 1 when doing LeetCode DSA questions.
> And also whether to use arrays.length -1 that kind of things as well as using 2 loops
> to do the sorting and whether to start the 2nd loop at 0 or 1 and sometimes people
> use the second loop to start at the first loop 0 index.

Java starts indexing with 0, so for an array like:
   int arr[] = new int[1];
you'd use index 0 for the one and only element, and arr.length would be 1.

A typical loop with an index would (in Java) look like:
   for (int i=0; i<arr.length; i++) {
      ... do something with arr[i]...;
   }
although there's also:
   for (int a : arr) {
      ... do something with a...;
   }
if you only need the values, but not their respective index.

I have no idea what you mean by "LeetCode DSA", and if they have
anything to do with Java, so I don't know, what index they feel like
having for the first element of their arrays.

> Hope someone can give me some guidance.
> Tks.