Find minimum covering substring

Q: Find minimum covering substring

This question evaluates algorithmic problem-solving skills in string processing, focusing on managing character multiplicities and correctness when identifying constrained substrings.

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Question

Given two strings s and t, return the shortest contiguous substring of s that contains every character of t with at least the same multiplicities. If multiple answers exist, return any one of the shortest; if none exist, return an empty string. State and justify your algorithm, analyze time and space complexity, and implement the solution in your preferred language.

Find minimum covering substring

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