hardM Mixed TopicsPattern: String and Two Pointers Operations
Minimal Coverage Substring Solution
Problem Statement
Given two strings `source` and `target`, find the minimum length substring of `source` that contains all characters of `target` at least once.
Examples
Example 1:
Input:{"source":"abcde","target":"ace"}
Output:3
Explanation: The minimum cost substring 'ace' has a length of 3
Example 2:
Input:{"source":"abcdef","target":"bcdf"}
Output:4
Explanation: The minimum cost substring 'bcdf' has a length of 4
Constraints
- 1 <= len(s) <= 10^6
- 1 <= len(t) <= 10^3
- ASCII only
Time: O(n*m) Space: O(n + m)
Analyze constraints and compute optimal solutions step-by-step.
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