DIY: Valid Parenthesis String
Solve the interview question "Valid Parenthesis String" in this lesson.
We'll cover the following
Problem statement
You are given a string named check
. Your task is to find out if this string is valid. This string will only contain three type of characters i.e., (
, )
, and *
.
A string is valid if it follows the following rules:
-
Every left
(
parenthesis must have a corresponding right)
parenthesis. -
Every right
)
parenthesis must have a corresponding left)
parenthesis. -
Every Left parenthesis
(
should appear before the corresponding right)
parenthesis. -
We can treat
*
as a single right or left parenthesis i.e.,(
or)
or as an empty string" "
.
Constraints
- The length of the string
check
will be in the range[1,100]
. - Every
check[i]
will be either left(
, or right)
parenthesis or an asterisk*
.
Input
The input will be a string called check
. The following are example inputs:
# Example 1
check = "()"
# Example 2
check = "(*)"
# Example 3
check = "((*)"
# Example 4
check = "(()"
Output
The output will be a boolean i.e, either True
or False
. The followings are sample outputs to the above inputs:
# Example 1
True
# Example 2
True
# Example 3
True
# Example 4
False
Coding exercise
You need to implement the function CheckValidString(check)
in the skeleton code below.
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