Problems/20. Valid Parentheses

20. Valid Parentheses

EasyStringStack

Verify if a sequence of parentheses, square brackets, and curly braces is properly structured. To be valid, every opening bracket must be closed by a matching bracket of the same type, and they must close in the correct order. Additionally, all brackets must be closed.

Example 1

Input: s = "()[]{}"

Output: true

Each opening bracket is immediately closed by its corresponding partner of the correct type.

Example 2

Input: s = "(]"

Output: false

The opening parenthesis '(' is closed by a square bracket ']', which is a mismatch.

Example 3

Input: s = "({[]})"

Output: true

The brackets are closed in the exact reverse order of their opening, forming a perfectly nested structure.

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