Leetcode Problem 2277. Closest Node to Path in Tree

2277. Closest Node to Path in Tree

Leetcode Solutions

Binary Lifting and Lowest Common Ancestor (LCA)

  1. Build a graph representation of the tree using adjacency lists.
  2. Perform a DFS from the root (node 0) to calculate the depth of each node and initialize the binary lifting table.
  3. Populate the binary lifting table using dynamic programming.
  4. For each query, find the LCA for (start, end), (start, node), and (end, node).
  5. Compare the depths of the three LCAs and return the one with the maximum depth as it is the closest to the target node.
  6. Repeat steps 4-5 for all queries.
UML Thumbnail

Iterating Cross Points

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...