The idea here is to repeatedly replace occurrences of balanced parentheses pairs ("()", "{}", "[]") with an empty string. This continues until no more replacements are possible. If the final string is ...
# 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 ...
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