fun - Tricks Tips Templates

Role

cp4.vn/fun collects tricks, tips, templates, small transforms, and contest shortcuts.

It is useful when a learner already understands the core topic and wants the small idea that saves time, avoids a trap, or makes an implementation cleaner.

Z function preview

Z/Pi conversion preview

Problem-specific template preview

General-purpose template preview

Purpose

• Collect clever observations, contest hacks, micro-optimizations, and elegant implementation ideas.
• Highlight memorable transforms, one-liners, and small techniques that save time in practice.
• Keep minimal readable templates and implementations for fast contest review.

Lineage

Project	Meaning	Time	Form
FUNC	Fast and Useful Notes for Competitions	Sep 2021	Discord
SPOG	SPyofgame's Personal Optimization Guidebook	Jan 2020	Markdown
TEMP	Templated Efficient Math Preparations	Jun 2022	LaTeX / Overleaf

Reference

Short	Project	Use
BITHACK	Bit Twiddling Hacks	Known bit manipulation techniques and integer tricks.

Learning Style

Leaf-like learning: users visit niche branches as specific leaves that depend on core knowledge.

Strengths To Preserve

• Good ideas are hard to rediscover without strong indexing.
• Small tricks often lack a standard name, so curated naming matters.

Weaknesses To Fix

• Many sites become noisy blog piles.
• Context is often missing, so people reuse a trick in the wrong setting.
• One-liners without explanation become hard to trust.

CP4CPP Rules

• Every trick should state its context, constraints, failure cases, and safer alternatives.
• Templates should stay minimal and readable.
• fun should link back to doc for the full theory and cpp for language details.