Description
Given a string 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.
Note that an empty string is also considered valid.
Example 1:
1 | Input: "()" |
Example 2:
1 | Input: "()[]{}" |
Example 3:
1 | Input: "(]" |
Example 4:
1 | Input: "([)]" |
Example 5:
1 | Input: "{[]}" |