Leetcode Problem 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

Leetcode Solutions

Depth-First Search (DFS) Recursive Approach

  1. Define a recursive function dfs that takes a TreeNode node, the array arr, and the current index i as arguments.
  2. If node is null or i is equal to the length of arr, return false.
  3. If the value of node does not match arr[i], return false.
  4. If i is at the last index of arr and node is a leaf, return true.
  5. Recursively call dfs for the left and right children of node with the next index i + 1.
  6. Return true if either recursive call returns true, otherwise return false.
  7. Call dfs with the root of the tree, arr, and index 0.
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Breadth-First Search (BFS) Iterative Approach

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