NZOI (New Zealand Olympiad in Informatics) Enhancer Userscript

Important

• THIS TOOL IS MADE FOR C++ USERS

• YOU MUST COPY THE CODE IN YOUR IDE AND THEN PRESS PASTE TO SAVE THE CODE

Features

IDE (on problem pages)

• Dark, split layout (problem ↔ editor)
• In-browser code editor
• Run sample tests directly in the page
• Submit without leaving the editor
• Simple local file manager (save / load / delete code)

Dashboard

• Dark UI
• Faster loading with caching
• Search, filter, and sort problems
• Manual tags & ratings
• Classification tools

---

Installation

1. Userscript

1. Install Tampermonkey (Chrome / Edge / Firefox)
2. Press this and follow the instructions
3. Go to https://train.nzoi.org.nz/ to see the effect!

---

2. Required: ModHeader (for cross-origin isolation)

The IDE embeds external tools (editor / diagnostics) that require COOP + COEP headers. Browsers do not allow setting these headers directly from userscripts, so ModHeader is required.

Install ModHeader

• Chrome Web Store: ModHeader
• Enable it for train.nzoi.org.nz

Add these headers (Response Headers)

Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: credentialless

Make sure ModHeader is enabled before loading the NZOI site.

Without this, the embedded IDE / diagnostics will not work correctly.

---

Usage

Coding

• Open any problem
• Editor appears automatically
• Code is saved per problem
• Run → executes sample tests
• Submit → submits to NZOI judge
• Codes → manage saved code

Dashboard

• Search by name or tag
• Sort by difficulty, progress, group
• Edit tags / ratings directly

---

Notes

• Everything is contained in one userscript
• No external setup besides ModHeader
• Works entirely in the browser