Leetcode Problem 2846. Minimum Edge Weight Equilibrium Queries in a Tree

2846. Minimum Edge Weight Equilibrium Queries in a Tree

Leetcode Solutions

Lowest Common Ancestor and Weight Frequency Counting

  1. Construct an adjacency list for the tree.
  2. Perform a DFS traversal to populate the following:
    • The depth of each node.
    • The parent of each node for binary lifting.
    • The frequency of each edge weight from the root to each node.
  3. Precompute the binary lifting table for LCA queries.
  4. For each query, find the LCA of the two given nodes.
  5. Calculate the total number of edges and the frequency of each weight on the path between the two nodes using the LCA.
  6. Determine the weight that appears most frequently on the path.
  7. The answer for each query is the total number of edges minus the frequency of the most common weight.
UML Thumbnail

Euler Tour and Segment Tree for LCA

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