Valid String
You have been given a string 'S' containing only three types of characters, i.e. '(', ')' and '*'.
A Valid String is defined as follows:
1. Any left parenthesis '(' must have a corresponding right parenthesis ')'.
2. Any right parenthesis ')' must have a corresponding left parenthesis '('.
3. Left parenthesis '(' must go before the corresponding right parenthesis ')'.
4. '*' could be treated as a single right parenthesis ')' or a single left parenthesis '(' or an empty string.
5. An empty string is also valid.
Your task is to find out whether the given string is a Valid String or not.
Input Format:
The first line of input contains an integer 'T' representing the number of test cases or queries to run. Then the test case follows.
The only line of each test case contains a string 'S'.
Output Format:
For each test case print 'Yes' if the string 'S' is a valid string otherwise print 'No' otherwise.
The output of each test case will be printed in a separate line.
Note:
You are not required to print the expected output; it has already been taken care of. Just implement the function.
Constraints:
1 <= T <= 100
1 <= N <= 5000
Where 'N' is the length of the string 'S'.
Time Limit: 1 sec
CodingNinjas
author
2y
Brute Force
We can try each of the three possibilities for every asterisk in the string with the help of recursion.
We will use a temporary string which will keep track of our current possible string....read more
CodingNinjas
author
2y
Dynamic Programming
The problem can be divided into smaller sub-problems and hence, we can use a dynamic programming approach which will be similar to the Matrix Chain Multiplication’s dynamic programm...read more
CodingNinjas
author
2y
Two pointers
Let’s first focus on the problem when there are no asterisks. For this problem, we can just use a variable to count the unmatched ‘(‘. Clearly, we don't want the value of this variable to ...read more
Add answer anonymously...
Top SimplifyVMS Software Developer Intern interview questions & answers
Popular interview questions of Software Developer Intern
>
SimplifyVMS Software Developer Intern Interview Questions
Stay ahead in your career. Get AmbitionBox app
Helping over 1 Crore job seekers every month in choosing their right fit company
65 L+
Reviews
4 L+
Interviews
4 Cr+
Salaries
1 Cr+
Users/Month
Contribute to help millions
Get AmbitionBox app