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Ranked list — switch sort or use Random for a fresh mix each visit.
| # | Problem | Topic | Difficulty | XP | Acceptance | Actions |
|---|---|---|---|---|---|---|
| 1 | Unique Visitors per Day sql210 | Web & Marketing Analytics | Easy | 10 | — | |
| 2 | Orders Stuck Unshipped sql355 | Order Fulfillment Pipeline | Medium | 40 | — | |
| 3 | Odd Even Linked List ds231 | Linked List (Advanced) | Medium | 40 | — | |
| 4 | Count Inversions ds082 | Sorting | Hard | 80 | — | |
| 5 | Longest Winning Streak sql113 | Gaps and Islands | Hard | 80 | — | |
| 6 | Single Number II ds186 | Bit Manipulation | Medium | 40 | — | |
| 7 | Rectangle Overlap ds301 | Geometry & Coordinates | Easy | 10 | — | |
| 8 | Kth Smallest in a Sorted Matrix ds456 | K-Way Merge | Medium | 40 | — | |
| 9 | Unique Paths ds155 | Dynamic Programming | Medium | 40 | — | |
| 10 | Last Stone Weight II ds319 | 2D DP & Knapsack Variants | Medium | 40 | — | |
| 11 | Excel Sheet Column Title ds267 | Simulation & Implementation | Easy | 10 | — | |
| 12 | Sparse Matrix Multiplication ds663 | Sparse Matrix & Vector Operations | Medium | 40 | — |
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