Array Compression

You are given an array $A$ containing $N$ positive integers. You can compress this array by performing the following operation: - Choose any non-empty array $B$ containing **positive integers**, such that there are **at least two disjoint occurrences** of $B$ in $A$ as a subarray$^\dagger$. - Then, choose two or more mutually disjoint occurrences of $B$ among the subarrays of $A$. Replace each