cpp-flashcards/org/study_deck_02/dsa/stack/0020-valid-parentheses.org

#+ANKI_DECK: study_deck_02
* TODO 0020. Valid Parentheses :easy:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0020. Valid Parentheses][0020. Valid Parentheses]]
:END:

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

An input string is valid if:

 - Open brackets must be closed by the same type of brackets.

 - Open brackets must be closed in the correct order.

 - Every close bracket has a corresponding open bracket of the same type.

*Example 1:*

*Input:* s = "()"

*Output:* true

*Example 2:*

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

*Output:* true

*Example 3:*

*Input:* s = "(]"

*Output:* false

*Example 4:*

*Input:* s = "([])"

*Output:* true

*Example 5:*

*Input:* s = "([)]"

*Output:* false

*Constraints:*

 - ~1 <= s.length <= 10^{4}~

 - ~s~ consists of parentheses only ~'()[]{}'~.

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python
class Solution:
    def isValid(self, s: str) -> bool:
#+end_src

** TODO C++
#+begin_src cpp
class Solution {
public:
    bool isValid(string s) {
        
    }
};
#+end_src