Browse the full problem set, protect your daily streak, and keep building depth.
| Status | Problem | Acceptance | Difficulty | Forge Coins | XP | Save to vault |
|---|---|---|---|---|---|---|
| 1. E-commerce — Product Price PairHash Table | 60.6% | Novice | 10 | +7 XP | ||
| 2. Package Manifest VerificationHash Table · String · Counting | 80.0% | Novice | 10 | +7 XP | ||
| 3. Longest Stable Battle FormationArray · Hash Table · Sliding Window | 66.7% | Hunter | 20 | +14 XP | ||
| 4. Cybersecurity Log Pattern DetectionTwo pointers · String · Dynamic programming | 35.5% | Hunter | 20 | +14 XP | ||
| 5. Employee Management — Missing Employee IDArray · In-Place Algorithm · Index Mapping | 62.5% | Hunter | 20 | +14 XP | ||
| 6. Airline Ticket Reselling — Fare Opportunity PlanningDynamic Programming · Array · Greedy | 50.0% | Beast | 30 | +21 XP | ||
| 7. Kingdom Battle: Capture the Maximum Number of VillagesArray · Sliding Window · Two Pointers | 75.0% | Beast | 30 | +21 XP | ||
| 8. Battle for the KingdomOptimization · Dynamic Programming · Array | 66.7% | Hunter | 20 | +14 XP | ||
| 9. Insert Position in a Spacecraft Cargo ListArray · Binary Search · Searching | 90.0% | Novice | 10 | +7 XP | ||
| 10. Space Mission Launch SequenceGraph · Topological Sort · Breadth-First Search | 55.0% | Hunter | 20 | +14 XP | ||
| 11. Alien DNA TransformationString · Dynamic Programming · Recursion | 54.5% | Beast | 30 | +21 XP | ||
| 12. Ancient Vault CodeSimulation · Number Manipulation · Math | 44.4% | Novice | 10 | +7 XP | ||
| 13. Ancient Vault Code II: The Palindrome QuestArray · Math · Palindrome | 44.4% | Hunter | 20 | +14 XP | ||
| 14. Team Formation PossibilitiesArray · Backtracking · Bit Manipulation | 16.7% | Hunter | 20 | +14 XP | ||
| 15. The Digital Alchemy ExperimentMath · Hash Set · Simulation | 100.0% | Novice | 10 | +7 XP | ||
| 16. Playlist RemixArray · Simulation · Implementation | 83.3% | Hunter | 20 | +14 XP | ||
| 17. Assembly Line InspectorString · Hash Map · Sliding Window | 36.4% | Beast | 30 | +21 XP | ||
| 18. Fruit BasketFrequency Counting · Two Pointers · Hash Map | 71.4% | Beast | 30 | +21 XP | ||
| 19. Garden PathImplementation · Boundary Traversal · Simulation | 83.3% | Hunter | 20 | +14 XP | ||
| 20. Ancient Roman InscriptionSimulation · Math · String | 77.8% | Novice | 10 | +7 XP | ||
| 21. Ancient Clock ReadingImplementation · Simulation · Math | 100.0% | Novice | 10 | +7 XP | ||
| 22. Bank Cheque WriterDivide and Conquer · Recursion · Math | 100.0% | Beast | 30 | +21 XP | ||
| 23. Factory PackagingBit Manipulation · Math · Binary Search | 100.0% | Hunter | 20 | +14 XP | ||
| 24. Rabbit Path— 1, 3, or 5 JumpsDynamic Programming · Recursion · Memoization | 13.3% | Novice | 10 | +7 XP | ||
| 25. Perfect Coin SquareBinary Search · Math · Number Theory | 75.0% | Novice | 10 | +7 XP |
