Solution: Remove Invalid Parentheses
Understand how to apply recursive backtracking to remove the minimum number of invalid parentheses from a string. Explore balancing parentheses, pruning invalid cases, and generating all unique valid expressions, which helps prepare for coding interviews focusing on string manipulation and recursion.
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Statement
You are given a string, s, that contains:
Lowercase English letters
Opening
'('and closing')'parentheses
A string is considered valid if:
All opening parentheses
'('are closed properly by a matching')'.The parentheses are in the correct order and nesting.
Letters can appear anywhere and do not affect validity.
Return all possible valid strings that can be formed by removing the minimum number of invalid parentheses. The answer must be a list of unique strings, in any order.
Constraints:
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