Competitive Programming 4 By Steven Halim Pdf Download — [portable]
| Resource | Best for | Format | Cost | | :--- | :--- | :--- | :--- | | | Data structures & graph theory proofs | Live Web + PDF export | Free | | CSES Problem Set | Testing every algo in CP4 | Interactive Judge | Free | | Codeforces EDU | Step-by-step video + code | Video + Forum | Free | | Halim's own NUS CS3233 | The exact syllabus of CP4 | Website archive | Free (Public) |
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