Solution: Remove Invalid Parentheses
Explore a backtracking algorithm to remove the fewest invalid parentheses from a string, generating all valid combinations. This lesson helps you understand how to count invalid parentheses and use recursion to ensure balanced expressions, enhancing your problem-solving skills in coding interviews with strings and parentheses.
We'll cover the following...
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:
...