Testing Div4-A in Polygon (Codeforces)

Описание: How to test a problem in https://polygon.codeforces.com/. This is how a testing process should look like.
Final problem: https://codeforces.com/gym/102873/pro...
1-hour follow-up talk with authors:    • Fixing Bad Problem in Polygon (Codeforces)  
Testing of other problems:    • Testing Div4 Round in Polygon (Codeforces)  

0:00 Intro
0:28 Statement
2:16 Sample Explanation
2:34 Issues
3:20 Solution
4:44 Wrong Solutions
7:06 Invocation
10:02 Tests
13:40 Generator
17:24 Validator
20:30 Validator Tests
23:17 Commit Changes

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