How should I practice Valid Parentheses?

Start by reading the full statement, solve the visible examples, then compare the pattern against related BlackRock online assessment problems in FastPrep.

Is Valid Parentheses associated with BlackRock?

FastPrep tags this as a BlackRock online assessment coding practice problem when the problem catalog has that company and stage context.

Valid Parentheses

BlackRock● EasyNEW GRADOA

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Problem statement

Given a string s containing only (, ), [, ], {, and }, return whether it is valid.

A string is valid when every opening bracket is closed by the same bracket type and brackets close in the correct nested order. The empty string is valid.

Function

isValidParentheses(s: String) → boolean

Examples

Example 1

s = "([]{})"return = true

Every bracket closes in the reverse order in which it opened.

Example 2

s = "([)]"return = false

The closing parenthesis appears before the square bracket is closed.

Constraints

0 <= s.length <= 100000.
s contains only the six bracket characters listed above.