Leetcode Problem 1628. Design an Expression Tree With Evaluate Function

1628. Design an Expression Tree With Evaluate Function

Leetcode Solutions

Stack-based Tree Construction with Polymorphism

  1. Initialize an empty stack.
  2. Iterate over each token in the postfix expression.
  3. If the token is a number, create a leaf node and push it onto the stack.
  4. If the token is an operator, pop two nodes from the stack. These nodes will be the children of the operator node.
  5. Create a new operator node with the two popped nodes as children and push this new node onto the stack.
  6. After processing all tokens, the stack should have one element, which is the root of the constructed binary expression tree.
  7. Return the root node.
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Factory Method Pattern for Node Creation

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