Question

Given a string s that contains parentheses and letters, remove the miniμm number of invalid parentheses to make the input string valid. Return all the possible results. You may return the answer in any order.

a. Remove the parentheses containing the maxiμm depth.
b. Remove the parentheses containing the miniμm depth.
c. Remove all parentheses with an opening parenthesis to the right.
d. Remove all parentheses with a closing parenthesis to the left.

Answer 1

The subject of this question is about solving a problem involving string manipulation in computer programming by removing invalid parentheses. The answer covers the topic of using a recursive algorithm to find all possible valid string combinations by removing parentheses. Four different strategies for removing parentheses are also discussed.

Step-by-step explanation:

The subject of this question pertains to solving a problem involving string manipulation in computer programming. Specifically, the task is to remove the minimum number of invalid parentheses from a given string to make it valid. This problem falls under the category of computer algorithms and data structures.

One approach to solving this problem is by using a recursive algorithm. We can keep track of the current open and close parentheses count as we iterate through the string. By removing a parentheses from the string, we create a new string with one less parentheses count. We can recursively check all possible combinations of removing parentheses and determine which ones lead to a valid string.

In addition, four different strategies can be applied to remove parentheses: removing the parentheses containing the maximum depth, removing the parentheses containing the minimum depth, removing all parentheses with an opening parenthesis to the right, and removing all parentheses with a closing parenthesis to the left.