Given a string S consisting only of the opening and closing curly brackets '{' and '}' find out the minimum number of reversals required to make a balanced expression using stack.A Balanced Expression is one where Each ‘{‘ has a corresponding ‘ }’ and all curly brackets inside it are also balanced.ExamplesInput 1:{{}{{}Output 1:1Explanation:To balance the given expression, reverse one open bracket to a closed bracket (i.e. {{}}{} )to make it a balanced one, thus printing 1.Input 2:}}{}{}{}{{{}}Output 2:-1Explanation:The string's length is 13, which is an odd number; thus, print -1.Input format :The input consists of a string consisting of opening and closing curly brackets.Output format :The output prints the minimum reversals required to make S balanced.If the length of the string is odd, print -1. If it is already balanced, print 0.
Question
Given a string S consisting only of the opening and closing curly brackets '{' and '}' find out the minimum number of reversals required to make a balanced expression using stack.A Balanced Expression is one where Each ‘{‘ has a corresponding ‘ }’ and all curly brackets inside it are also balanced.ExamplesInput 1:{{}{{}Output 1:1Explanation:To balance the given expression, reverse one open bracket to a closed bracket (i.e. {{}}{} )to make it a balanced one, thus printing 1.Input 2:}}{}{}{}{{{}}Output 2:-1Explanation:The string's length is 13, which is an odd number; thus, print -1.Input format :The input consists of a string consisting of opening and closing curly brackets.Output format :The output prints the minimum reversals required to make S balanced.If the length of the string is odd, print -1. If it is already balanced, print 0.
Solution
To solve this problem, we can use a stack data structure. Here are the steps:
-
Initialize an empty stack and a variable
countto 0. The stack will be used to keep track of the unbalanced brackets andcountwill keep track of the number of reversals. -
Iterate over the string. For each character:
- If it is an opening bracket '{', push it to the stack.
- If it is a closing bracket '}':
- If the stack is empty, it means we have an unbalanced closing bracket. Increment
countand push an opening bracket '{' to the stack. - If the stack is not empty, it means we have a matching opening bracket in the stack. Pop the opening bracket from the stack.
- If the stack is empty, it means we have an unbalanced closing bracket. Increment
-
After the iteration
Similar Questions
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