Suggest an editImprove this articleRefine the answer for “What is "element shifting" and why is it inefficient?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Element shifting** is an operation in which, after the first element of an array is removed, all the remaining elements move one position forward to fill the freed space. **Key point:** shifting takes O(n) time, which is why queues use a circular buffer or a linked list instead of a plain array, where removal happens in O(1).Shown above the full answer for quick recall.Answer (EN)Image**Element shifting** is an operation in which, after the first element of an array is removed, all the remaining ones **move one position forward** to fill the freed space. For example, if there was a queue `[A, B, C, D]`, and `A` is removed, the array becomes `[B, C, D]`: this requires physically shifting all elements by one position. Why this is inefficient: - Every removal requires **moving all the remaining elements**, - This takes **O(n)** time, where `n` is the number of elements, - With large amounts of data, such shifts drastically slow the program down. That is why, instead of a plain array, queues are implemented using: - a **circular buffer** (indexes "wrap around" cyclically), - or a **linked list**, where removal and addition happen in **O(1)** without shifting.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.