# 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 ...
- It can be written as AB (A concatenated with B), where A and B are valid strings, or - It can be written as (A), where A is a valid string. You are given a parentheses string s. In one move, you can ...
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