Pls Explain The Q

#1

I dont undersrand this Q. Pls explain and give a hint to solve this question…

#2

@code_breaker-1001 In this question you are given with n and m, where n is the length of the string after concatenation of the string and m is the previous length of the string. And then you are also given with a string in next line which is ‘s’. So you have to concatenate some string before and after s so that it becomes a string which is balanced with the parenthesis. So you have to return the total number of ways to make the string balanced.

#3

Can U give me a simple soln or a deeper explanation as to how I can proceed here…

#4

@code_breaker-1001

  1. It is quite obvious that we would only add opening brackets ‘(’ to string A and only closing brackets ‘)’ to string B

  2. Since the number of open and close brackets must be equal, we can never generate a valid string if n is odd.

  3. Count the total number of opening and closing brackets required to balanced the string. The opening brackets will go in string A and the closing brackets will go in string B.

  4. We start from pos = 0 and go till pos = n - m + 1. At each instance we consider three possibilities.
    *if closingBrackets have not been implemented yet (close==0) and count of open brackets that we have implemented is more than required (open >= openBrackets) then, we implement the closing brackets required for string B and raise a flag for the same by marking close=1 also, change the open bracket count accordingly for this case
    *if we have some open brackets then, put a closing bracket to balance it and decrease open count to denote there is one less unbalanced open bracket now
    *add another opening bracket to the string so far. This bracket will be initially unbalanced.

  5. We add the results obtained from the three possibilities. We store and return this result.

  6. Continue the above process till pos < n-m+1.

  7. At pos == n-m+1, we must ensure that all required opening and closing brackets have been implemented. We do so by checking the status of out flag variable close i.e. check close==1. Also make sure there are no pending unbalanced open brackets (open==0).