| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Bear and Prime 100 | Codeforces | Codeforces Round #356 (Div. 1) & Codeforces Round #356 (Div. 2) | 2 |
| 2 | Guess the Array | Codeforces | Technocup 2017 - Elimination Round 1 (Unofficially Open for Everyone, Rated for Div. 2) | 4 |
| 3 | Interactive LowerBound | Codeforces | AIM Tech Round 4 (Div. 1) & AIM Tech Round 4 (Div. 2) | 5 |
| 4 | Pick Heroes | Codeforces | Mail.Ru Cup 2018 Round 3 | 5 |
| 5 | Mahmoud and Ehab and the binary string | Codeforces | Codeforces Round #435 (Div. 2) | 6 |
| 6 | Searching Rectangles | Codeforces | Codeforces Round #371 (Div. 1) & Codeforces Round #371 (Div. 2) | 6 |
| 7 | Glad to see you! | Codeforces | Codeforces Round #415 (Div. 1) & Codeforces Round #415 (Div. 2) | 6 |
| 8 | Subway Pursuit | Codeforces | Codeforces Round #507 (Div. 1, based on Olympiad of Metropolises) & Codeforces Round #507 (Div. 2, based on Olympiad of Metropolises) | 6 |
| 9 | Vladik and Favorite Game | Codeforces | Codeforces Round #416 (Div. 2) | 6 |
| 10 | Divisors | Codeforces | Lyft Level 5 Challenge 2018 - Elimination Round | 6 |
| 11 | Interactive Bulls and Cows (Easy) | Codeforces | Testing Round #13 | 7 |
| 12 | Something with XOR Queries | Codeforces | Technocup 2018 - Elimination Round 2 | 7 |
| 13 | The penguin's game | Codeforces | Codeforces Round #427 (Div. 2) | 8 |
| 14 | Lost Root | Codeforces | Codeforces Round #523 (Div. 2) | 9 |
| 15 | Interactive Bulls and Cows (Hard) | Codeforces | Testing Round #13 | 9 |