Linked List in Binary Tree - Solution & Explanation

This approach utilizes depth-first search (DFS) recursively to search through the binary tree. For each node that matches the head of the linked list, we will try to match the remaining nodes of the linked list with the children nodes of the current tree node.

We define a helper function isSubPathFromNode to check if a given node in the binary tree can serve as the starting point of a subpath that matches the linked list. It performs a depth-first search recursively. If the current list node matches the tree node, it calls itself on the next list node with both children.

This strategy employs an iterative depth-first search using an explicit stack to avoid recursion-driven call stacks. We simulate the recursive call stack with a custom stack structure, effectively managing process states iteratively as we check for potential subpaths.

Using an explicit stack to simulate recursion, this C solution handles the depth-first search iteratively. Each stack element consists of a tree node and the matching list node associated with that state. We continuously pop from the stack, testing elements.