How to recover a binary tree from a traversal?

[Aliviya]

Re: How to recover a binary tree from a traversal?
Here is a possible solution to recover the binary tree from the pre-order traversal and the child count information:

• Create a stack to store the nodes that have not yet been processed.
• Initialize the stack with the root node.
• While the stack is not empty:
• Pop the top node from the stack.
• Get the child count of the node.
• If the child count is 2:
• Push the right child of the node onto the stack.
• Push the left child of the node onto the stack.
• If the child count is 1:
• Push the child of the node onto the stack.
• If the child count is 0:
• Do nothing.
  This algorithm works by first pushing the root node onto the stack. Then, it repeatedly pops the top node from the stack and pushes its children onto the stack, one by one. The child count information is used to determine which children to push onto the stack.