The Grimoire-Copyists of Vellumhaugh Abbey

The Abbess of Vellumhaugh holds the only surviving copy of the *Codex Ashenward*, a grimoire of binding-rites, and its ink is fading fast. The Guild of Quiet Hands is commissioned to copy it before the codex is lost. The copyists work in parallel at the same pace, so the copying lasts as long as the heaviest share given to any one copyist.

The grimoire's chapters are given in order as pages, a list of positive integers where pages[i] is the page count of chapter i. There are scribes copyists, an integer of at least 1.

The chapters are divided under these rules: - Every chapter is copied whole by exactly one copyist. A chapter is never split. - Each copyist takes one contiguous run of chapters. The order of the chapters is never changed. - A copyist may be given no chapters at all.

A copyist's load is the total number of pages in their chapters.

Write heaviestShare(pages, scribes), which returns an integer: the smallest possible value of the largest load, taken over all valid ways to divide the chapters. If pages is empty, return 0.