Search
⌘K
Get Premium
Leetcode 1483. Kth Ancestor of a Tree Node
Given a rooted tree as a parent[] array, preprocess it to efficiently answer many queries asking for the k-th ancestor of a node (return -1 if it doesn't exist). The core challenge is supporting up to ~5·10^4 nodes/queries by using a log-depth jump-pointer (binary lifting) structure to achieve fast queries after preprocessing.
Question Timeline
See when this question was last asked and where, including any notes left by other candidates.
All Regions
Comments
Hello Interview Premium
Your account is free and you can post anonymously if you choose.