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Given a string that includes only'(',')','{','}','[',']', determine whether the string is valid.

A valid string must satisfy:

The left parenthesis must be closed with the same type of closing parenthesis.

The left parenthesis must be closed in the correct order.

Note that an empty string can be considered a valid string.

Example 1:

Enter: "()"

Output: true

Example 2:

Enter: "() [] {}"

Output: true

Example 3:

Enter: "(]"

Output: false

Example 4:

Enter: "([)]"

Output: false

Example 5:

Enter: "{[]}"

Output: true

Parsing:

Here, let front take n steps, then front and back go at the same time until front.next is empty, find the last but one node, and then delete it.

What are the basic data types of java? the basic data types of Java can be divided into: 1. Integer types, which are used to represent the data types of integers. 2. Floating point type, which is used to represent the data type of decimals. 3. Character type. The keyword of character type is "char". 4. Boolean type, which is the basic data type that represents logical values.

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