# What does the “0 ≤ K < N-1” expression means?

Given the following statement:

"A nonempty array A consisting of N integers is given. Any integer K, such that 0 ≤ K < N-1, splits array A into two non-empty parts"

What does the 0 ≤ K < N-1 expression mean in this context?

• Can you provide the reference to the original source like a url or the section of a book? Do we have enough context? Can you provide more context? Does it mean splitting the array $A$ into the first $K$ integers and the others? Or the last $K$ integers and the others? – Apass.Jack Oct 5 '18 at 21:52

You have an array with indices from $$0$$ to $$N-1$$. $$K$$ is an in integer in this range, i.e. larger or equal to zero and smaller than $$N-1$$.
Part 1: From $$0$$ to $$K$$ (including K)
Part 2: From $$K$$ (excluding K, i.e. starting with $$K+1$$) to $$N-1$$.
$$K$$ has to be smaller than $$N-1$$ (and not smaller or equal) because else there would only be one Part (the whole array) for $$K= N-1$$.
$$a means $$a and $$b.