Leetcode Problem 736. Parse Lisp Expression

736. Parse Lisp Expression

Leetcode Solutions

Define a helper function evaluate_expression that takes the expression string and the current scope as arguments.
If the current expression is a number, return its integer value.
If the current expression is a variable, return its value from the scope.
If the current expression is an operation (let, add, mult), parse the expression accordingly.
- For let, parse variable assignments and update the scope, then evaluate the last expression with the updated scope.
- For add, evaluate both operands and return their sum.
- For mult, evaluate both operands and return their product.
Use a stack to handle nested expressions, pushing the current scope onto the stack when entering a new scope and popping it when leaving a scope.
Iterate through the expression string, updating the index as the string is parsed.
Return the result of evaluating the expression.

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