How should I practice Valid Parentheses?

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

Is Valid Parentheses associated with Amazon?

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

Problem · String

Valid Parentheses

● Easy

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Problem statement

Given a string s containing only the bracket characters (, ), [, ], {, and }, determine whether it is valid.

A string is valid when every opening bracket is closed by the same type of bracket and brackets close in the reverse order in which they were opened. The empty string is valid.

The problem statement continues

Pro

Examples

Example 1

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

Each opening bracket is immediately followed by its matching closing bracket.

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