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AC Library is the official library ofAtCoder. This repository manages the contents of AC Library.

You may refer to the following links for more details:

• The Announcement on AtCoder
• The Announcement on Codeforces
• Practice Contest
• AC Library Document(en)
• AC Library Document(ja)

The documents of master branch are as follows:

• AC Library Document(en, master)
• AC Library Document(ja, master)

Our goal of this project is to achieve that

• Enableevery AtCoder users to use this library withminimum efforts of studying about PC
• Maximize convenience forthe usage in competitive programming. We completely ignore other usages.
• No bugs. This is a fantasy, but we pursue this.

By this policy, we ignore some manners of C++ intentionally. For example,

• we don't usesize_t, but useint.
• Segtree handles function pointers, not functional objects.
• and so on...

We haven't decided whether we should increase this library's contents or not because there are pros and cons.If you are interested in this topic, please join the discussion inThe Announcement on Codeforces.

For now, we are not planning to add new features, and we use this repository only for

• collecting issues
• recording the changelogs
• versioning our releases

We accept issues/PRsonly from AtCoder users.

We would appreciate it if you would report our mistakes like a typo, or, more importantly, bugs!

As mentioned above, we haven't decided which way to go. Therefore we are not accepting feature requests for now, and issues will be closed.

You can view the newest version of AC Library inThe Announcement on AtCoder page.

You can also see all versions inThe Release page.

This library is released under theCC0, except for the third-party libraries that are located under/document_(en|ja)/lib directory. Please refer/document_en/lib/LICENSE.md for details.