Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
Given two strings `s` and `t` of lengths m and n respectively, return the minimum window substring of `s` such that every character in `t` (including duplicates) is included in the window. If there is no such substring, return the empty string `""`. The testcases will be generated such that the answer is unique.
Example
s = "ADOBECODEBANC", t = "ABC" → "BANC"
Constraints
1 ≤ m, n ≤ 10⁵ · s and t consist of upper- and lower-case English letters
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