The data structure required to check whether an expression contains a balanced parenthesis is?
Question
The data structure required to check whether an expression contains a balanced parenthesis is?
Solution 1
The data structure required to check whether an expression contains a balanced parenthesis is a Stack.
Here is the step by step process:
- Start scanning the expression from the left to the right.
- If the current character is an opening bracket (i.e., '(' or '{' or '[') then push it to the stack.
- If the current character is a closing bracket (i.e., ')' or '}' or ']') then pop an element from the stack. If the popped element is the matching opening bracket then continue to the next character. If it is not a match, then the expression is not balanced.
- Continue this process until all the characters in the expression are scanned.
- If the stack is empty after scanning all characters, then the expression is balanced. If the stack is not empty, then the expression is not balanced.
Solution 2
The data structure required to check whether an expression contains a balanced parenthesis is a Stack.
Here's a step by step process:
- Start scanning the expression from the left to the right.
- If the current character is an opening bracket (i.e., '(' or '{' or '[') then push it to the stack.
- If the current character is a closing bracket (i.e., ')' or '}' or ']') then pop an element from the stack. If the popped element is the matching opening bracket then continue to the next character. If it is not a match then the parenthesis are not balanced.
- After the complete scanning, if there is some element left in the stack then the parenthesis are not balanced. If the stack is empty then the parenthesis are balanced.
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Check for Balanced ParenthesesWrite a function that takes a string of parentheses and checks if the parentheses are balanced using a stack.Constraints:NAExample:Sample Input-1:(())Sample Output-1:trueSample Input-2:((Sample Output-2:falseExplanation:In both of these examples, parentheses must appear in a balanced fashion. Balanced parentheses means that each opening symbol has a corresponding closing symbol and the pairs of parentheses are properly nested.Public Test Cases:# INPUT EXPECTED OUTPUT1 (())true2 ((false
A sequence of parentheses is called balanced if it consists entirely of pairs of opening/closing parentheses (in that order), which is well nested. For example, sequences "(())()", "()" and "(()(()))" are balanced, while "(()" and "(()))(" are not. Write a program to determine if a given string contains a balanced sequence of parentheses. The input to the function balanced parentheses is a string str. Each character in the string will be "(" or ")". The output is the count of balanced pairs if the sequence is balanced or -1 otherwise. For example, if the input sequence is "(()(()))", the expected output is 4.
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