✅ [Python/Rust/C++] fast & concise using two-pointer sliding window (with detailed comments)
\u2705 IF YOU LIKE THIS SOLUTION, PLEASE UPVOTE.\n*\nThis solution employs a two-pointer sliding window approach to search for the minimum substring. Time compl
**\u2705 IF YOU LIKE THIS SOLUTION, PLEASE UPVOTE.**\n****\nThis solution employs a two-pointer sliding window approach to search for the minimum substring. Time complexity is linear: **O(n+m)**. Space complexity is linear: **O(n)**. \n\n| Language | Runtime | Memory |\n|---|---|---|\n| [**Python**](https://leetcode.com/submissions/detail/827879845/) | **105 ms (92.26%)** | **14.6 MB  (83.90%)** |\n| [**Rust**](https://leetcode.com/submissions/detail/827849495/) | **0 ms (100.00%)** | **2.2 MB (69.33%)** |\n| [**C++**](https://leetcode.com/submissions/detail/827877701/) | **0 ms (100.00%)** | **7.8 MB  (68.10%)** |\n\n<iframe src="https://leetcode.com/playground/gqPFE9ur/shared" frameBorder="0" width="800" height="600"></iframe>\n
['C', 'Python', 'Rust']