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< p > Given a string s represents the serialization of a nested list, implement a parser to deserialize it and return < em > the deserialized< / em > < code > NestedInteger< / code > .< / p >
< p > Each element is either an integer or a list whose elements may also be integers or other lists.< / p >
< p > < / p >
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< p > < strong class = "example" > Example 1:< / strong > < / p >
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< pre >
< strong > Input:< / strong > s = " 324"
< strong > Output:< / strong > 324
< strong > Explanation:< / strong > You should return a NestedInteger object which contains a single integer 324.
< / pre >
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< p > < strong class = "example" > Example 2:< / strong > < / p >
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< pre >
< strong > Input:< / strong > s = " [123,[456,[789]]]"
< strong > Output:< / strong > [123,[456,[789]]]
< strong > Explanation:< / strong > Return a NestedInteger object containing a nested list with 2 elements:
1. An integer containing value 123.
2. A nested list containing two elements:
i. An integer containing value 456.
ii. A nested list with one element:
a. An integer containing value 789
< / pre >
< p > < / p >
< p > < strong > Constraints:< / strong > < / p >
< ul >
< li > < code > 1 < = s.length < = 5 * 10< sup > 4< / sup > < / code > < / li >
< li > < code > s< / code > consists of digits, square brackets < code > " []" < / code > , negative sign < code > ' -' < / code > , and commas < code > ' ,' < / code > .< / li >
< li > < code > s< / code > is the serialization of valid < code > NestedInteger< / code > .< / li >
< li > All the values in the input are in the range < code > [-10< sup > 6< / sup > , 10< sup > 6< / sup > ]< / code > .< / li >
< / ul >
