Leetcode Problem 301. Remove Invalid Parentheses

301. Remove Invalid Parentheses

Leetcode Solutions

Calculate the number of misplaced left and right parentheses (left_rem and right_rem).
Use a helper function to perform backtracking, starting with the first character of the string.
If the current character is not a parenthesis, add it to the current expression and continue.
If the current character is a parenthesis, consider two cases: including it or excluding it from the current expression.
When excluding a parenthesis, decrement the corresponding left_rem or right_rem.
Only include a right parenthesis if it does not lead to an invalid expression (i.e., right_count < left_count).
If the end of the string is reached and left_rem and right_rem are both zero, add the current expression to the result set if it's not already present.
After exploring all possibilities, return the contents of the result set as a list.

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