Practice
Problems to sharpen your skills before a test or an interview. Try as often as you like: nothing here is seen by employers.
Solved 0 of 62
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| Problem | Area | Kind | Difficulty | Your progress |
|---|---|---|---|---|
| Largest sum of a run | Arrays | Code | medium | Not tried |
| Turn a grid | Arrays | Code | medium | Not tried |
| Autoscaling | Cloud | Multiple choice | medium | Not tried |
| Totals per team | Data | Code | medium | Not tried |
| Blue-green deploy | DevOps | Multiple choice | medium | Not tried |
| Kubernetes probes | DevOps | Multiple choice | medium | Not tried |
| Fewest coins | Dynamic programming | Code | medium | Not tried |
| Undo a pushed commit | Git | Multiple choice | medium | Not tried |
| Count the islands | Graphs | Code | medium | Not tried |
| Shortest way out | Graphs | Code | medium | Not tried |
| The k most frequent numbers | Heaps | Code | medium | Not tried |
| HashMap and equals | Java | Multiple choice | medium | Not tried |
| Event loop order | JavaScript | Multiple choice | medium | Not tried |
| let in loops | JavaScript | Multiple choice | medium | Not tried |
| Prioritising | Product | Multiple choice | medium | Not tried |
| is vs == | Python | Multiple choice | medium | Not tried |
| State updates | React | Multiple choice | medium | Not tried |
| useEffect dependencies | React | Multiple choice | medium | Not tried |
| Index use | SQL | Multiple choice | medium | Not tried |
| LEFT JOIN | SQL | Multiple choice | medium | Not tried |
| Merge meeting times | Searching and sorting | Code | medium | Not tried |
| SQL injection | Security | Multiple choice | medium | Not tried |
| Boundary values | Testing | Multiple choice | medium | Not tried |
| Flaky test | Testing | Multiple choice | medium | Not tried |
| CORS | Web | Multiple choice | medium | Not tried |