How should I practice Minimum Window Substring?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Lyft phone screen problems in FastPrep.

Is Minimum Window Substring associated with Lyft?

FastPrep tags this as a Lyft phone screen coding practice problem when the problem catalog has that company and stage context.

Problem · String

● Hard

LyftFULLTIMEPHONE SCREEN

Given strings s and t, return the shortest contiguous substring of s that contains every character of t, including duplicate occurrences.

If no such substring exists, return the empty string. The answer is guaranteed to be unique whenever it exists.

minWindow(s: String, t: String) → String

s = "ADOBECODEBANC"t = "ABC"return = "BANC"

"BANC" contains A, B, and C, and no shorter substring contains all three.

s = "a"t = "a"return = "a"

The entire source string is the only window and contains the required character.

s = "a"t = "aa"return = ""

The source string has only one a, so it cannot satisfy the target multiplicity.