Leetcode Problem 2096. Step-By-Step Directions From a Binary Tree Node to Another

2096. Step-By-Step Directions From a Binary Tree Node to Another

Leetcode Solutions

Find Paths and Remove Common Prefix

  1. Perform a DFS from the root to find the path to the start node, appending 'L' or 'R' to the path string as we move left or right, respectively.
  2. Perform a DFS from the root to find the path to the destination node, similarly appending 'L' or 'R' to the path string.
  3. Reverse both path strings since they were constructed in a bottom-up manner.
  4. Remove the common prefix from both paths, which corresponds to the path from the root to the LCA.
  5. Replace all characters in the start path with 'U' to indicate the upward movement to the LCA.
  6. Concatenate the modified start path with the remaining destination path to form the final path.
  7. Return the final path string.
UML Thumbnail

LCA and Path Reconstruction

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