How should I practice Valid Parenthesis String?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Oracle phone screen problems in FastPrep.

Is Valid Parenthesis String associated with Oracle?

FastPrep tags this as a Oracle phone screen coding practice problem when the problem catalog has that company and stage context.

Oracle● MediumFULLTIMEPHONE SCREEN

Given a string s containing '(', ')', and '*', return whether it can become a valid parenthesis string.

Each '*' may independently represent an opening parenthesis, a closing parenthesis, or the empty string.

checkValidString(s: String) → boolean

s = "(*)"return = true

The wildcard may be empty.

s = "(*))"return = true

Treat the wildcard as an opening parenthesis.