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
Question
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
Solution
Here is a step-by-step solution to the problem:
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Initialize an empty stack.
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Iterate over the string of parentheses from left to right.
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If the current character is an opening parenthesis '(', push it onto the stack.
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If the current character is a closing parenthesis ')', check if the stack is empty. If the stack is empty, return false because there is no matching opening parenthesis for this closing parenthesis. If the stack is not empty, pop the top element from the stack.
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After iterating over the entire string, check if the stack is empty. If the stack is empty, return true because all opening parentheses have a matching closing parenthesis. If the stack is not empty, return false because there are some opening parentheses that do not have a matching closing parenthesis.
Here is a Python function that implements this algorithm:
def is_balanced(s):
stack = []
for char in s:
if char == '(':
stack.append(char)
elif char == ')':
if not stack:
return False
stack.pop()
return not stack
This function returns true for the string "(())" and false for the string "((".
Similar Questions
Valid ParenthesesRachel is studying nested structures and wants to validate if a given string of parentheses is valid. A valid string has matching opening and closing parentheses in the correct order.Constraints:NAExample:Sample Input:()[]{}Sample Output:trueExplanation:In the above example, the string is valid because every opened parentheses is closed in the correct order and the output is truePublic Test Cases:# INPUT EXPECTED OUTPUT1 ()[]{}true
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.
7. Consider the usual algorithm for determining whether a sequence of parentheses is balanced. The maximum number of parentheses that appear on the stack AT ANY ONE TIME when the algorithm analyzes: (()(())(()))?a) 1b) 2c) 3d) 4 or more
The data structure required to check whether an expression contains a balanced parenthesis is?
You are a software developer tasked with improving the syntax validation system for a code editor. One of your responsibilities is to ensure that all blocks of code within the editor have balanced curly brackets. Your goal is to determine the minimum number of reversals required to make an expression of curly brackets balanced. A balanced expression is one where each opening curly bracket '{' has a corresponding closing curly bracket '}', and all curly brackets are properly nested.To achieve this, write to write a program that uses a stack data structure to help identify and fix unbalanced expressions. Example 1Input: ([]{[]})Output: BalancedExplanation: The user inputs the expression "([]{[]})". The program checks whether the brackets are balanced or not. In this case, all the brackets are balanced, so it prints "Balanced" as the output.Example 2Input: (([{}])Output: Not BalancedExplanation: The user inputs the expression "(([{}])". The program checks whether the brackets are balanced or not. In this case, the closing brackets do not match the corresponding opening brackets, so it prints "Not Balanced" as the output.Input format :The input consists of a string representing the expression.Output format :The output should print either "Balanced" or "Not Balanced" based on the input expression.Refer to the sample output for the formatting specifications.Code constraints :Input expression includes only parentheses, curly brackets, and square bracketsSample test cases :Input 1 :([]{[]})Output 1 :BalancedInput 2 :(([{}])Output 2 :Not Balanced
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