Handle invalid Lisp expression parsing

Q: Handle invalid Lisp expression parsing

This question evaluates the ability to parse and evaluate nested Lisp-like expressions, manage variable bindings and scope resolution, and detect malformed input and syntax errors.

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LeetCode 736. Parse Lisp Expression – Given a string representing a Lisp-like expression containing let/add/mult operations and variable bindings, evaluate the expression and return the integer result. In addition to the standard problem, the input string may be syntactically invalid; detect invalid cases (e.g., mismatched parentheses, unknown tokens) and return an error indicator.

https://leetcode.com/problems/parse-lisp-expression/description/

Handle invalid Lisp expression parsing

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