Coding problems
Real-world Python, SQL and data problems — try first, then check hints and the solution.
All topicsPythonSQL / MySQLData ScienceNumPyPandasMatplotlibMachine LearningDeep LearningArtificial IntelligenceLarge Language ModelsDjangoAPIsGit & GitHubPower BIExcelStatistics
| # | Problem | Topic | Difficulty |
|---|---|---|---|
| 1 | FizzBuzz | Python | Easy |
| 2 | Reverse words in a sentence | Python | Easy |
| 3 | Two Sum | Python | Easy |
| 4 | Valid palindrome | Python | Easy |
| 5 | Top-k frequent words | Python | Medium |
| 6 | Second highest salary | SQL / MySQL | Medium |
| 7 | Top earner per department | SQL / MySQL | Hard |
| 8 | Monthly sales summary | Pandas | Medium |
| 9 | Flatten a nested list | Python | Medium |