Codeforces

800 Practice Set

A curated mini-collection of Codeforces 800-rated problems implemented in C++. Every solution lives in 800/ and aligns with the original statement that you can revisit through the included screenshots and the consolidated questionsANDstepBYstepGuides.md file.

Repository structure

competitive_programming-codeforce/
├── 800/
│   ├── 1_Watermelon.cpp
│   ├── 2_Way_Too_Long_Words.cpp
│   ├── 3_Team.cpp
│   ├── 4_Bitpp.cpp
│   ├── 4_BitppRealLife.cpp            # Analogy describing ++/-- intuitively
│   ├── 4_incrementDecrementInDetailes.cpp
│   ├── 5_Next_Round.cpp
│   ├── questionsANDstepBYstepGuides.md # All screenshots + an extended note
│   └── Problem Questions Photos/       # PNG statements pulled from Codeforces
└── README.md

CHECK THE 800 FOLDER FOR MORE!

Problem lineup

#	Problem	Core skill	Code & references
1	Watermelon	Basic parity & constructive proofs	1_Watermelon.cpp · screenshot inside Problem Questions Photos/1)_Watermelon.png
2	Way Too Long Words	String compression logic	2_Way_Too_Long_Words.cpp
3	Team	Aggregating teammate votes	3_Team.cpp
4	Bit++	Pre/post increment reasoning	4_Bitpp.cpp · extra intuition files (4)_BitppRealLife.cpp, 4)_incrementDecrementInDetailes.cpp)
5	Next Round	Threshold filtering on sorted scores	5_Next_Round.cpp · walkthrough in questionsANDstepBYstepGuides.md

Tip: open questionsANDstepBYstepGuides.md if you want every screenshot in one place along with a plain-language breakdown of Next Round.

How to run a solution

1. Install any C++17-capable compiler (MinGW-w64 g++, clang, MSVC, etc.).

2. Compile the file you care about. Example using PowerShell for Bit++:

   cd E:\CP-GitHub_Clone\competitive_programming-codeforce
   g++ -std=c++17 -O2 .\800\4_Bitpp.cpp -o bitpp.exe
   .\bitpp.exe
   

3. Supply input exactly as Codeforces describes (copy/paste sample tests or use redirection: Get-Content sample.txt | .\bitpp.exe).

Suggested study flow

• Skim the screenshot in Problem Questions Photos/ or the guide file, then attempt the implementation yourself before peeking at the provided .cpp.
• Compare your approach with the repository’s version and record any takeaways inside your own notes or by extending questionsANDstepBYstepGuides.md.
• When you’re ready for tougher sets, clone this layout for 900/, 1000/, etc., to keep a consistent archive.

Contributing & next steps

• Keep filenames in the <index>)_<ProblemName>.cpp pattern so the problem order stays consistent.
• Add new screenshots to Problem Questions Photos/ and reference them from the guide file to maintain a single source of truth.
• Future ideas:
  • Automate compilation/testing via a small script or task file.
  • Add commentary blocks inside each solution explaining key lines.
  • Grow the catalog with more 800-level warmups or step up to 900+.

Happy grinding, and may every submission be Accepted! 🚀