Reverse Substrings Between Each Pair of Parentheses - Solution & Explanation

Utilize a stack to handle the nested or paired parentheses efficiently. By pushing characters onto a stack until a closing parenthesis is encountered, then reversing the needed substring, you can leverage the stack's LIFO properties to achieve the desired result.

This C solution uses an array-based stack to reverse substrings between parenthesis pairs. It iterates through the string, storing characters inside a stack until a closing parenthesis requires a substring reversal. The reversed substring is then pushed back onto the stack, achieving the desired sequence without parentheses.

This approach involves separately building the result string in a single pass using an auxiliary data structure to track position swaps. The use of local in-string reversals enables an efficient and clean traversal building mechanism.

This C solution divides the task into first creating pair indices for easy traversal and reversal through position swapping, enabling an efficient processing path that aligns with the stack-based idea but applied to index transformations and direct character use.