Balanced parenthesesTake the string input of parentheses from the user, return the balanced string that can be produced from it,perform deletion if there are unbalanced parentheses.if there are no balanced parentheses it should return NoneFor example, given "(())((", you could return "(())".Given "))()()(", you could return "()()".Sample Test CasesTest Case 1:Expected Output:enter·the·string:·(())(((())Test Case 2:Expected Output:enter·the·string:·))()()(()()
Question
Balanced parenthesesTake the string input of parentheses from the user, return the balanced string that can be produced from it,perform deletion if there are unbalanced parentheses.if there are no balanced parentheses it should return NoneFor example, given "(())((", you could return "(())".Given "))()()(", you could return "()()".Sample Test CasesTest Case 1:Expected Output:enter·the·string:·(())(((())Test Case 2:Expected Output:enter·the·string:·))()()(()()
Solution
Sure, here is a Python solution for the problem:
def balance_parentheses(s):
stack = []
for char in s:
if char == '(':
stack.append(char)
elif char == ')' and stack and stack[-1] == '(':
stack.pop()
else:
return None
return ''.join(stack)
# Test cases
print(balance_parentheses("(())(((")) # Expected output: (())
print(balance_parentheses("))()()(()")) # Expected output: ()()
This solution works by using a stack to keep track of the parentheses. When we encounter an opening parenthesis, we push it onto the stack. When we encounter a closing parenthesis, we check if the top of the stack is an opening parenthesis. If it is, we pop it from the stack. If it isn't, we return None because the parentheses are unbalanced. Finally, we join the remaining elements in the stack to form the balanced string.
Similar Questions
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.
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
Given a string s of '(' , ')' and lowercase English characters.Your task is to remove the minimum number of parentheses ( '(' or ')', in any positions ) so that the resulting parentheses string is valid and return any valid string.Formally, a parentheses string is valid if and only if:It is the empty string, contains only lowercase characters, orIt can be written as AB (A concatenated with B), where A and B are valid strings, orIt can be written as (A), where A is a valid string. Example 1:Input: s = "lee(t(c)o)de)"Output: "lee(t(c)o)de"Explanation: "lee(t(co)de)" , "lee(t(c)ode)" would also be accepted.
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.An input string is valid if:Open brackets must be closed by the same type of brackets.Open brackets must be closed in the correct order.Every close bracket has a corresponding open bracket of the same type. Example 1:Input: s = "()"Output: trueExample 2:Input: s = "()[]{}"Output: trueExample 3:Input: s = "(]"Output: false Constraints:1 <= s.length <= 104s consists of parentheses only '()[]{}'.
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
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