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I found out that China NOI problems are very interesting and hard, of course. I dont find any editorial for these problems on the internet so can anybody provide me some editorial ?
A chinese editorial could be helpful too (I hope google translate is enough).
Most of problems can be found here
Auto comment: topic has been updated by Long_VuV (previous revision, new revision, compare).
Here is a link I found which has editorials for 2007-2018. Hope this helps.
And btw PEG judge migrated to dmoj.ca
Am i missing something or you have provided wrong link ? Problems in your link dont match with China NOI problems, such as 2007 and 2010
Oh yeah. Sorry that is the Singapore NOI.
The chinese NOI I found it really hard to find solutions but here are some pretty old solutions https://byvoid.com/zhs/blog/noi-solutions/
Luogu also has editorials for most of the problems but they are all chinese and are behind a login wall. (I might try to translate them into english if I get some free time. )
You can use This to find the editorial.It has the links of most of individual editorial. When you search one problems like https://darkbzoj.tk/problem/4195 ,you can see the "题解" button,then you can see the links.
Well, there are official editorials for the problems (after each contest day there is a presentation session), but they are not easy to find, because the officials do not actively publish these materials. Sometimes the problemsetter may upload the editorials, but also sometimes these materials are not made public. As far as I know, there is not a complete archive publicly available to everyone.
You can find the statements and tutorials for NOI 2020 (last year) here (in Chinese). You can also find statements and test data from recent years on LOJ (here).
There are also ways to find editorials written by the participants. You can search for the ID of the problem in the LOJ (or other Chinese OJ) through a search engine and view only the Chinese results. Most of the results obtained are blogs written by the participants. You can do this, for example, by going to https://www.google.com/webhp?lr=lang_zh-CN.
The LOJ contains problems from recent years. For older problems, you can try using darkbzoj.
it seems like i need to learn chinese :))
Problems in NOI 2021 are quite "special".
NOI is the most difficult contest in China. Fewer than 300 can enter it(About 100,000 enter contest which is the lowset every year). So entering NOI is the most proudest thing to Chinese OIer.