No Two Alike

You are given an array $A$ of length $N$. Your goal is to make all elements of $A$ distinct. To achieve this, you can perform the following operation any number of times: - Select two indices $l$ and $r$ such that $1 ≤ l ≤ r ≤ |A|$. In the subarray $A [ l … r ]$, keep only the first occurrence of each element, and remove all subsequent repetitions of each element within this range. The cost