Leetcode Problem 2689. Extract Kth Character From The Rope Tree

2689. Extract Kth Character From The Rope Tree

Leetcode Solutions

Optimized Recursive Traversal

  1. Define a recursive function getKthCharacter that takes a RopeTreeNode and an integer k as arguments.
  2. If the current node is null, return a placeholder character (e.g., \0).
  3. If the current node is a leaf (node.len == 0), return the character at index k-1 of node.val if k is within bounds.
  4. If the current node is an internal node, check if the left child exists.
  5. If the left child exists, determine if the k-th character is in the left subtree by comparing k with the len of the left child.
  6. If k is less than or equal to the left child's len, recurse into the left child with k.
  7. If k is greater than the left child's len, recurse into the right child with k adjusted by subtracting the left child's len.
  8. Continue this process until the k-th character is found.
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Recursive String Construction

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