| Judge | Profile |
|---|---|
| Beecrowd | https://www.beecrowd.com.br/judge/profile/74386 |
| Topcoder | https://www.topcoder.com/members/olegon.main |
| Codeforces | http://codeforces.com/profile/_olegon |
| HackerRank | https://www.hackerrank.com/olegon |
| CodeChef | https://www.codechef.com/users/olegon |
| LeetCode | https://leetcode.com/olegon |