mediumStackPattern: Pattern recognition and application of stack data structure for parsing
Valid Nested Tags Solution
Problem Statement
Given a sequence of tags, determine whether the sequence is valid, meaning every opening tag can be matched with a corresponding closing tag. The sequence is valid if it is possible to pair every opening tag with a closing tag that occurs after it, and the tags are properly nested.
Constraints
- The input sequence will contain at most 1000 tags.
- The input sequence will only contain valid XML tag names and '<' and '>' characters.
Time: O(n) Space: O(n)
The optimal approach is to use a stack data structure to parse the XML sequence. This approach has a time complexity of O(n) as we make a single pass through the input string, and a space complexity of O(n) for storing the opening tags in the stack.
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