{ "data": { "question": { "questionId": "20", "questionFrontendId": "20", "boundTopicId": null, "title": "Valid Parentheses", "titleSlug": "valid-parentheses", "content": "

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

\n\n

An input string is valid if:

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    \n\t
  1. Open brackets must be closed by the same type of brackets.
    2. \n\t
  2. Open brackets must be closed in the correct order.
    3. \n\t
  3. Every close bracket has a corresponding open bracket of the same type.
    4. \n
\n\n

 

\n

Example 1:

\n\n
\nInput: s = "()"\nOutput: true\n
\n\n

Example 2:

\n\n
\nInput: s = "()[]{}"\nOutput: true\n
\n\n

Example 3:

\n\n
\nInput: s = "(]"\nOutput: false\n
\n\n

 

\n

Constraints:

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Node.js 16.13.2.

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