Code RoomShortest substring containing chars
HardPrep Room Coding #1386

Shortest substring containing chars

CodingAlgorithms & data structuresMid–Senior~32 min

Given a lowercase string s and a lowercase string t, return the shortest substring (window) of s that contains every character of t including multiplicity (a character needed twice must appear at least twice in the window). If no such window exists, return the empty string. If multiple shortest windows tie, return the leftmost. Lengths up to a few thousand.

Implement
min_window_substring(s: str, t: str) → str
Examples
in["adobecodebanc","abc"]out"banc"
What a strong answer looks like

State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.

0:00 of about 32 min
InputExpectedGot
["adobecodebanc","abc"]"banc"not run yetsample