Yet Another Palindrome Problem

Chef has an array $A$ of size $N$. He can perform the following operation on $A$: - Select an $i$ $(1 \le i \le N)$ and for all $1 \le j \le i$, set $A_j := A_j + 1$ (i.e. add $1$ to every element in the prefix of length $i$). Chef wants to convert $A$ to a *palindrome* by using the above operation **minimum** number of times. Can you help Chef? If it is not possible to convert $A$ to a *palind