{leetcode}/problems/valid-parentheses/[LeetCode - Valid Parentheses^]
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
An input string is valid if:
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Open brackets must be closed by the same type of brackets.
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Open brackets must be closed in the correct order.
Note that an empty string is also considered valid.
Example 1:
Input: "()" Output: true
Example 2:
Input: "()[]{}"
Output: true
Example 3:
Input: "(]" Output: false
Example 4:
Input: "([)]" Output: false
Example 5:
Input: "{[]}"
Output: true
- 一刷
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link:{sourcedir}/_0020_ValidParentheses.java[role=include] - 二刷
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link:{sourcedir}/_0020_ValidParentheses_2.java[role=include]