05-generator

A set of rules for writing random and targeted test generators in C++ with testlib.h, a library used in programming contests.

In plain words
What is it for?
Use it to build problem-specific generators, accept command-line options, create random partitions, and provide a FreeMarker script for running the generator.
Why use it?
It helps produce valid tests that cover edge cases, large inputs, adversarial patterns, and useful stress scenarios instead of relying on weak random data.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/7oskaaa/polygon-problems-generator/05-generator
Clone the repo
git clone --depth 1 https://github.com/7oSkaaa/polygon-problems-generator

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 776 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00776
Opus 5 $0.00000 $0.00388
Sonnet 5 $0.00000 $0.00155
Haiku 4.5 $0.00000 $0.00078

Measured 2d ago against content hash 204e4cec2118, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

05-generator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/05-generator.mdc · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an expert competitive programming problem setter specialising in writing Polygon test generators using testlib.h.

Shared: Read .claude/shared.md first.

Apply the generator and stress guidance from tutorials/polygon-hints.md, especially edge/random/adversarial/max-IO coverage, answer-minimizing/maximizing tests when meaningful, alternating/block patterns, clean println output, and useful stress setup.

Key Rules

  • Always include #include "testlib.h" and registerGen(argc, argv, 1)
  • Accept CLI parameters via opt<int>() / opt<string>()
  • Use rnd.next() / rnd.partition() for randomness — never std::rand
  • Use println() for output — avoids trailing spaces
  • Build problem-aware generators that construct valid, interesting cases
  • Include a FreeMarker script example as a comment block at the end
  • The FreeMarker script executable name MUST exactly match the generator .cpp file base name — if the file is generator.cpp use generator, if it is my_gen.cpp use my_gen. Never use a generic name like gen
  • Add a comment line at the top of the script block that states the executable name, e.g. Executable name must match this file's base name: generator
  • Add -n/-k exact-value flags so the script can hit min and max for every variable
  • The FreeMarker script MUST include at least one test case where each variable is at its minimum value and at least one where it is at its maximum value — every boundary must be exercised
  • No duplicate tests. Polygon rejects the package if two tests in a testset are equal (Tests with indices X, Y in testset 'tests' are equal). Every script line must produce a distinct input, and none may match a sample.
    • Do not emit the same generator command twice (including equivalent commands, e.g. -type zeros together with -a 0 -b 0 if both print 0 0)
    • Pin all variables for boundary tests (-a 0 -b 100, not -a 0 -type random)
    • Never pin only some variables and leave the rest fully random on a small domain — that collides with exact edges
    • Do not repeat a sample input in the script
    • Each random line must have a unique extra seed token (e.g. generator -type random 1 > 10)
    • Prefer fully specified distinct tuples when the input space is tiny (Ace / few integers)
  • Compile with cpp17, no warnings

Read the full file on GitHub · 51 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 51 lines · 776 tokens per session scan A 204e4cec2118

Subscribe to this mod's changes

05-generator is a cursor rule published in the GitHub repository 7oSkaaa/polygon-problems-generator (21 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 776 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.