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Problem: Minimum Window Substring

Explore how to solve the minimum window substring problem by applying a sliding window and two-pointer technique. Understand how to track character frequencies, dynamically adjust your window size, and achieve optimal O(m+n) time complexity for efficient string manipulation in Python.

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Statement

Given two strings s and t of lengths m and n, respectively, find the minimum window substring of s that contains every character in t, including duplicate characters. If no such substring exists, return an empty string "".

The test cases are generated such that the answer is always unique.

Note: Can you find an algorithm that runs in O(m+n)O(m + n) time?

Constraints:

  • m ==== s.length

  • n ==== t.length

  • 1≤1 \leq m, n ≤105\leq 10^5 ...