| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Acme Corporation | UVA | 5 | |
| 2 | Students Initiation | Codeforces | 2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest, qualification stage (Online Mirror, ACM-ICPC Rules, Teams Preferred) | 8 |
| 3 | Almost Permutation | Codeforces | Educational Codeforces Round 29 | 8 |
| 4 | Machine Programming | Codeforces | VK Cup 2012 Round 3 | 8 |
| 5 | Four Melodies | Codeforces | Educational Codeforces Round 24 | 9 |