Suggest an editImprove this articleRefine the answer for “What is the complexity of inserting an element into a hash table?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)The average **time complexity of inserting an element** into a hash table is **O(1)**, meaning the operation runs in constant time. **Key point:** in the worst case, if there are many collisions or the table is too full, insertion can take O(n).Shown above the full answer for quick recall.Answer (EN)ImageThe average **time complexity of inserting an element** into a hash table is **O(1)**, meaning the operation runs in constant time. **Why O(1):** 1. The hash function quickly computes the index. 2. The element is immediately placed into the right slot (bucket). 3. There is no need to scan other elements. **But in the worst case:** - If there are **many collisions**, - or the table is **too full**, insertion can take **O(n)**, because it will have to search for a free slot or walk through the chain of elements in the bucket. **Summary:** - **Average complexity:** O(1) - **Worst case:** O(n) - **With a good hash function and a sufficiently sized table:** insertion is almost always instant.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.