The results of leetcode contests typically require over 15 minutes to account for every participant. However, https://lccn.lbao.site/ consistently predicts ratings before all participants' results are collected. For instance, during today's bi-weekly contest (4/29/2023), the prediction occurred at 11:11:43 AM CDT, but the final participant count was only completed around 11:20 AM. Consequently, the last page of https://lccn.lbao.site/predicted/biweekly-contest-103 displays 12,498 participants, while the actual total was 17,137. This incomplete data leads to inaccurate rating predictions.

Now the predicted ranking does not include the data of Chinese servers

Thanks for the website & hard work you put in.

===

I have been mentioning https://lccn.lbao.site/ in many places and possibly many others.
Site may be more popular now than in last few months, so might need little upgrade.

Today either timeout or below continuous loading bar comes up:

Both home page & current contest page is down
. https://lccn.lbao.site/
. https://lccn.lbao.site/predicted/biweekly-contest-110

Also unable to see previous contests.

Biweekly Contest 115 ranks are slightly off

All users at below link have ranks between 3326 to 3350
https://leetcode.com/contest/biweekly-contest-115/ranking/134/

However, take any user, and check at below link, it shows ranks to have between 4130 to 4157
https://lccn.lbao.site/predicted/biweekly-contest-115

please look into this when possible @baoliay2008

https://lccn.lbao.site/predicted/weekly-contest-373
user - razorsharp7

https://leetcode.com/contest/weekly-contest-373/ranking/196/

Could you please add country ranking ?

I can only find lccn users in predicted list. Please have a look into this @baoliay2008

Weekly Contest 364 https://leetcode.com/contest/weekly-contest-364/
contest has ended.

but ratings are not available

unable to access here - https://lccn.lbao.site/predicted/weekly-contest-364
and https://lccn.lbao.site/

@baoliay2008 kindly look into it

Description
The site https://lccn.lbao.site/ is not loading properly
Checked on multiple devices

Screenshot

The site is down
https://lccn.lbao.site/
https://lccn.lbao.site/predicted/biweekly-contest-105

Is there a way to help you so site can be up - post contests?

the same as #3 due to sorting by question_id

It continues to show the loading sign, it is an internal server error(500).

On the leetcode contests website, the URL is formatted like weekly-contest-367/ranking/<page_number>. This allows users to skip to a page number they want. On the prediction page, the URL is formatted like /weekly-contest-367/, which gives no page number skipping capabilities.

The only way to navigate through pages on the current site is with the buttons below the ratings, which only allows you to move two pages back or forward (Shown below).

This is very inconvenient, as there are hundreds of pages per contest. Could we change the URL routing system or add a button on the page navigator that allows the user to specify which page they would like to navigate to? I would be happy to work on this issue.

the same as #3 due to sorting by question_id

Currently, when there is a positive change in rating, it is depicted in red color and is green on negative changes. I think it would be better to use green color to reflect positive changes and red for negative ones.

When I click the username textbox
I used to get a popup of previous searched usernames

Today it didn't come up

Even after I searched for a username, it does not show up popup of recently searched usernames

It is good to show last 50 or so searched usernames, in a drop down with a scroll bar ( previously it used to show only 5 or so )
thank you for your efforts & time.

For example


Predictor show 9868 successful attempts and leetcode shows 8532

Can't find score of China area.

Every code that has been written by a user, together with the submission time, is stored in our database.
If this website provides a feature that allows us to determine how many times a specific code has been sent, or if that number surpasses a predetermined threshold, we may label it red to indicate that the code has been copied.

We can simply use Plagiarism detection techniques-

1. Text-Based Plagiarism Detection - Some popular tools include Turnitin, Copyscape, and MOSS (Measure Of Software Similarity).
2. Code Similarity Algorithms - Libraries like Simian and JPlag are examples.

ML Integration : Train machine learning models to identify code plagiarism. You can use techniques like natural language processing (NLP) and deep learning to analyze and compare code submissions.

Problem Description

Currently, Q1-Q4 are sorted by credit at first and then by question_id.

But for "biweekly contest 97", Q3's question_id is bigger than Q4's question_id

db.getCollection('Question').find(
    {"contest_name" : "biweekly-contest-97"}, 
    {title:1, title_slug:1, credit:1, question_id:1, _id:0}
).sort({credit:1, question_id:1})

↩️

/* 1 */
{
    "question_id" : 2639,
    "credit" : 3,
    "title" : "Separate the Digits in an Array",
    "title_slug" : "separate-the-digits-in-an-array"
}

/* 2 */
{
    "question_id" : 2640,
    "credit" : 4,
    "title" : "Maximum Number of Integers to Choose From a Range I",
    "title_slug" : "maximum-number-of-integers-to-choose-from-a-range-i"
}

/* 3 */
{
    "question_id" : 2641,
    "credit" : 5,
    "title" : "Disconnect Path in a Binary Matrix by at Most One Flip",
    "title_slug" : "disconnect-path-in-a-binary-matrix-by-at-most-one-flip"
}

/* 4 */
{
    "question_id" : 2673,
    "credit" : 5,
    "title" : "Maximize Win From Two Segments",
    "title_slug" : "maximize-win-from-two-segments"
}

So, Q3 and Q4 are misplaced.

Observed Time

Sun Feb 5 00:51:31 UTC+8, 2023

Possible Solution

• 🤔️

如题

The Site has been down again. When i try to open it, it gets stuck on loading the page

Problem Description

leetcode.com didn't fetch data from leetcode.cn, cannot find any CN user's record.

• Current participant count in Biweekly Contest 94 - leetcode.com is 14632
• Current participant count in Biweekly Contest 94 - leetcode.cn is 2298

Observed Time

Sun Dec 25 00:53:30 UTC+8, 2022
53 minutes after the contest ended.

Possible Solution

• Fetch CN users' data and merge into US main site.

以 https://lccn.lbao.site/api/v1/contest-records/user?contest_name=weekly-contest-338&username=tian-tang-6 为例

其中 finish_time, insert_time, predict_time 分别代表什么及对应时区是什么？

我大概试了一下时区没对的上

我是需要该竞赛对应的用户开始时间，用户结束时间的数据

[
    {
        "_id": "641fcb550455ebb2feb3c666",
        "contest_name": "weekly-contest-338",
        "contest_id": 843,
        "username": "tian-tang-6",
        "user_slug": "tian-tang-6",
        "country_code": "CN",
        "country_name": "**",
        "rank": 1,
        "score": 18,
        "finish_time": "2023-03-26T02:59:06",
        "data_region": "CN",
        "insert_time": "2023-03-26T04:34:28.298000",
        "attendedContestsCount": 116,
        "old_rating": 3065.1544669116574,
        "new_rating": 3174.170162632678,
        "delta_rating": 109.01569572102062,
        "predict_time": "2023-03-26T04:38:28.557000"
    }
]

During the Elo rating system, calculating $f(x) = \sum \dfrac{1}{1 + 10^{x - R_i}}$ each time in linear complexity is actually a waste of time. By using FFT, we can calculate $f(x)$ for all $x \in \mathbb{Z}$ and $x \in [0, 8000]$.

You can check out here to learn how python make it done. In short, set $g(x)$ as the count of people with a rating $x$, and $h(x) = \dfrac{1}{1 + 10^{x}}$. By computing $g(x)$ and $h(x)\ \ (x \in [-8000,8000])$, we can use a FFT to convolve these two functions, thus calculates $f(x)$.

In Leetcode, I think we can multiply each rating by 10 and round them to integers. The lengths of arrays will be bigger than usual, but the complexity of this algorithm is still perfect. $O(10M \log (10M) + n \log M)$ is way smaller than $O(N^2 \log M)$.

目前**区个性id设置时仅支持小写字母，但我的账号是从leetcode.com迁移来的，似乎保留的含大写字母的id。因此我直接搜索全是小写的id搜不到自己。

目前两个社区个人页面的id均是大小写不敏感的，例如：
https://leetcode.cn/u/johnkram/
https://leetcode.cn/u/JOHNKRAM/

https://leetcode.com/neal_wu/
https://leetcode.com/NEAL_WU/

可以考虑在搜索用户名时不区分大小写

Here you can see the number of users who successfully submitted the question 1 is almost 10 less than what is displayed on https://lccn.lbao.site/predicted/biweekly-contest-122

On the main website change of each rating (delta) has red color shade for positive rating and Green color for negative rating change.
This seems so off , an Improvement should be represented by Green color and decrement in rating with Red.

If this seems to be an Issue. Kindly assign this to me.

In the contest page, i tried searching "21cash" (with Capital C) and i got nothing found
but after i searched "21Cash" (With capital C) i got my result shown to me.

biweekly-contest-116 ratings not up yet at https://lccn.lbao.site/predicted/biweekly-contest-116
it's been about 2 & 1/2 hours post contest

===

ideally,

1 https://lccn.lbao.site/ should show Biweekly Contest 116 after contest is completed

Currently shows below:

2 https://lccn.lbao.site/predicted/biweekly-contest-116
should show proper message of why there is delay
For example: "US Data not present. Check back after few hours", etc.

Currently shows below:

===

thanks for your hard work @baoliay2008

Leecode's Biweekly Contest 107 has been declared unrated for LCUS users.
The rank predictions need to be synced with current Leetcode ranking.

I am not able to run the front end of the application. On running the command npm start, I get below error:

  Line 22:   'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 23:   'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 24:   'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 25:   'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 26:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 27:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 28:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 34:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 40:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 41:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 42:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 42:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 43:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 45:  'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 49:   'React' must be in scope when using JSX  react/react-in-jsx-scope
  Line 50:   'React' must be in scope when using JSX  react/react-in-jsx-scope

Biweekly 123 has been unrated and Weekly 383 has been rejudged so please update the rating accordingly.
Thus ratings needs to be resynced with leetcode

Looks like the graph is not visible anymore

https://lccn.lbao.site/predicted/biweekly-contest-109

getting this error while executing step number 8 from this..
| ERROR | app.db.mongodb:start_async_mongodb:100 - Failed to start mongodb. error=Authentication failed., full error: {'ok': 0.0, 'errmsg': 'Authentication failed.', 'code': 18, 'codeName': 'AuthenticationFailed'}
pls help
`1-git clone [email protected]:baoliay2008/lccn_predictor.git
2-cd lccn_predictor

write your mongodb environment config

3-cp config.yaml.template config.yaml
4-vi config.yaml

5-python3.10 -m virtualenv venv/
6-source venv/bin/activate

7-pip3 install -r requirements.txt

8-python main.py
9-uvicorn api.entry:app --host 0.0.0.0 --port 55555`

Today I gave LeetCode biweekly contest, I submitted the last question 30 seconds prior to the end, and the algorithm is most probably not considering my submission for the last question while predicting the delta and the combined rank.