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Ranked list — switch sort or use Random for a fresh mix each visit.
| # | Problem | Topic | Difficulty | XP | Acceptance | Actions |
|---|---|---|---|---|---|---|
| 1 | Parallel Courses (Minimum Semesters) ds279 | Topological Sort & DAG | Medium | 40 | — | |
| 2 | Last Day of Each Month With Sales sql455 | Calendar Grouping | Easy | 10 | — | |
| 3 | Orders in the Last 7 Days sql148 | Date Arithmetic | Easy | 10 | — | |
| 4 | Active Users Retention by Cohort sql092 | Advanced Queries | Hard | 80 | — | |
| 5 | Caesar Cipher ds526 | Run-Length & Encoding | Easy | 10 | — | |
| 6 | Bulls and Cows ds606 | Game & Board Simulation | Medium | 40 | — | |
| 7 | Ones and Zeroes ds318 | 2D DP & Knapsack Variants | Medium | 40 | — | |
| 8 | Employees per Department Including Empty Ones sql016 | Aggregation & GROUP BY | Medium | 40 | — | |
| 9 | Sales per Quarter sql453 | Calendar Grouping | Medium | 40 | — | |
| 10 | 3-Day Moving Average sql044 | Window Functions | Medium | 40 | — | |
| 11 | Salary Change vs Previous Hire sql398 | LEAD & LAG Scenarios | Medium | 40 | — | |
| 12 | Aggregate Rows Into a JSON Array sql158 | JSON & Semi-structured Data | Medium | 40 | — |
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