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Learn Data Structures and Algorithms in C++

Problem: Minimum Window Substring

Explore how to identify the smallest substring in a string containing all characters of another using a sliding window technique. Learn to use two pointers and hash maps to achieve an optimal O(m+n) time complexity solution.

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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 ...