3691. Course Schedule Cycle Detection Directed Graph (Part 13)
StringsSliding Window
### Problem #3691: Course Schedule Cycle Detection Directed Graph (Part 13)
**Domain:** `DSA` | **Topic Focus:** `Strings, Sliding Window`
Implement an optimized, production-grade solution for **Course Schedule Cycle Detection Directed Graph (Part 13)**.
### Requirements:
1. Your code must handle boundary inputs, edge cases, and maintain optimal time & space complexity.
2. In production, this logic scales to high-throughput environments.
3. Return the exact computed result.
Example 1:
Input: Sample Input #3691
Output: Output 1
Explanation: Demonstrates correct execution for Strings in DSA.
Constraints:
- Time Complexity: Optimal for standard production loads.
- Space Complexity: O(1) auxiliary or O(N) linear storage.
- Ensure memory safety, clean error propagation, and zero race conditions.