Expand algebraic expression with distribution

Q: Expand algebraic expression with distribution

This question evaluates parsing of algebraic expressions, application of the distributive law, string manipulation, and algorithmic reasoning about time and extra-space complexity.

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Given an expression of lowercase letters, '+', '', and parentheses with no '+' outside any parentheses, return an equivalent expression containing only '+' by fully expanding all products (e.g., (a+b)(c+d) → ac+ad+bc+bd). Achieve O(

extra-space complexity. Follow-up: If '+' may appear outside parentheses (e.g., a+b c (d+e+f)+k+m*(g+h)+i), output the fully expanded '+'-only form (a+bcd+bce+bcf+k+mg+mh+i). Provide working code that may use O(n) extra space (e.g., a stack).

Expand algebraic expression with distribution

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