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Jun 9, 2020 · Our task is to find the minimum number of bracket reversal needed to make an expression balanced. The reversal is to convert the parenthesis of type ‘ { ‘ into ‘ } ’ and vice-versa. If the expression cannot be converted into balanced expression, simply return “-1”. Example: 1. {{}} => 0 number of reversal needed as the expression is ...
Feb 4, 2021 · The idea for this approach is to consider every bracket and then recursively count the number of reversals. We will have only two cases: either a bracket remains the same or converted to another. If we get a valid string, we will count the cost and update the minimum cost so far. Algorithm:
The minimum number of operations in transforming ‘STR’ to either of the two valid strings is 1.So, the total cost is 1. For the second test case: Given ‘STR’ is already valid so the minimum number of operations required is 0. So, the total cost is 0. Sample Input 2: 3 {}}{}} {{{{ {{{}} Sample Output 2: 1 2 -1
The expression follows 0 or more closed brackets followed by 0 or more opened brackets. Now we can easily calculate how many reversals we need to convert the expression into a balanced one. Let n be the number of closed brackets, and m be the number of open brackets. According to this, we will need [n / 2] + [m / 2] reversals.
Feb 3, 2021 · In the end, we return our required answer. Here is the algorithm : We declare ‘minSwaps’ and ‘count’ for storing the resultant answer and for counting the difference of open and closed brackets, respectively. We run a loop for ‘i’ = ’0’ to ‘N’: If the current character is ‘ (‘: ‘count ++’. Else: ‘count--’.
Apr 13, 2023 · Given a directed tree with V vertices and V-1 edges, we need to choose such a root (from given nodes from where we can reach to every other node) with a minimum number of edge reversal. Examples: In above tree, if we choose node 3 as our. root then we need to reverse minimum number. of 3 edges to reach every other node,
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