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| # | Problem | Topic | Difficulty | XP | Acceptance | Actions |
|---|---|---|---|---|---|---|
| 1 | 0-1 BFS: Minimum Obstacle Removal ds257 | Shortest Path Algorithms | Hard | 80 | — | |
| 2 | Active Subscribers per Month sql183 | Subscription Metrics | Hard | 80 | — | |
| 3 | Active Users Retention by Cohort sql092 | Advanced Queries | Hard | 80 | — | |
| 4 | Alien Dictionary ds277 | Topological Sort & DAG | Hard | 80 | — | |
| 5 | All Subordinates of a Manager sql072 | CTE & Recursive Queries | Hard | 80 | — | |
| 6 | Articulation Points ds311 | Graph Algorithms (Advanced) | Hard | 80 | — | |
| 7 | Avoid Deadlocks in Transfers sql162 | Transactions & Concurrency | Hard | 80 | — | |
| 8 | Bank vs Ledger Mismatches sql305 | Reconciliation & Balances | Hard | 80 | — | |
| 9 | Bell Number (Set Partitions) ds500 | Counting Sequences (Combinatorial Numbers) | Hard | 80 | — | |
| 10 | Biggest Percentage Raise sql332 | Salary History (Slowly Changing Data) | Hard | 80 | — | |
| 11 | Binary Tree Cameras ds248 | Tree DP & Advanced Trees | Hard | 80 | — | |
| 12 | Binary Tree Maximum Path Sum ds100 | Binary Trees | Hard | 80 | — |
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