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| 1 | +# LeetCode Contest Analytics |
| 2 | +The following observations are conducted with **_Amazon Redshift_**. |
| 3 | + |
| 4 | +## Data Overview |
| 5 | +- The collected data are from the top **50,000** users of _LeetCode_ global contest ranking and **2334** problems |
| 6 | +of **585** contests. |
| 7 | +- The range of ratings in the data collected is **1788 - 3700**. |
| 8 | + |
| 9 | +## Duplicated Users |
| 10 | +- There are roughly **60** users that appear more than once in the collected data, not including _NULL_ or deleted users. |
| 11 | +- Their accounts exist in both US and CN data regions. |
| 12 | + |
| 13 | +## Countries by Number of Users |
| 14 | + |
| 15 | +- Approximately **15,600** users are from unknown countries. |
| 16 | +- China and India are the two largest populations in the world. The markets in these countries are probably more |
| 17 | +competitive as well. |
| 18 | +- These top countries are likely more competitive and developed in the tech market. |
| 19 | + |
| 20 | +## Average Ranking by Rating Bracket |
| 21 | + |
| 22 | +- _Average ranking_ is the average placement of all contests a user attended. |
| 23 | +- Overall, the average ranking distribution is pretty diverse, except for the top contestants. |
| 24 | +- The lower the rating, the more diverse the average ranking. |
| 25 | +- It can be inferred from the data that users with higher ratings usually perform more consistently across contests. |
| 26 | +- Contestants can predict their future growth and potential rating bracket based on this graph. Eg: A person with a |
| 27 | +current rating of 2000 and an average ranking of 100 can possibly reach 3250+ without difficulty. |
| 28 | + |
| 29 | +## Topics by Number of Appearances |
| 30 | + |
| 31 | +- These topic tags show up most frequently during contests. |
| 32 | +- The topic tags in _LeetCode_ might be insufficient. Eg: A problem uses the line sweep technique, but it's not tagged line sweep. |
| 33 | +- Practicing these topics accordingly might improve your average contest placement. |
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