| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Fast Maximum Matching | SPOJ | 1 | ||
| 2 | Puzzles | Codeforces | Codeforces Round #196 (Div. 2) | 1 | |
| 3 | BerSU Ball | Codeforces | Codeforces Round #277.5 (Div. 2) | 1 | |
| 4 | Dungeon of Death | SPOJ | 1 | ||
| 5 | Vertex Cover | SPOJ | 1 | ||
| 6 | Queue at the School | Codeforces | Codeforces Round #163 (Div. 2) | 1 | |
| 7 | Taxi | SPOJ | 1 | ||
| 8 | My T-shirt suits me | UVA | 2 | ||
| 9 | Software Allocation | UVA | 2 | ||
| 10 | Angels and Devils | SPOJ | 2 | ||
| 11 | Computer Games II | TJU | 2 | ||
| 12 | Gopher II | UVA | 2 | ||
| 13 | Muddy Fields | SPOJ | 2 | ||
| 14 | The Problem with the Problem Setter | UVA | 2 | ||
| 15 | SAM I AM | UVA | 3 | ||
| 16 | Nuts and Bolts | UVA | 3 | ||
| 17 | Councilling | UVA | 3 | ||
| 18 | Factors and Multiples | UVA | 3 | ||
| 19 | The dog task | UVA | 3 | ||
| 20 | Antenna Placement | UVA | 3 | ||
| 21 | Welcome Party | Live Archive | 2013 | North America - Mid-Central USA | 3 |
| 22 | Gopher Strategy | UVA | 4 | ||
| 23 | Attacking rooks | UVA | 4 | ||
| 24 | Two Sets | Codeforces | Codeforces Round #268 (Div. 1) & Codeforces Round #268 (Div. 2) | 4 | |
| 25 | Weird Fence | UVA | 4 | ||
| 26 | Attacking Rooks | URI | 4 | ||
| 27 | Drazil and Tiles | Codeforces | Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) | 4 | |
| 28 | Help General | Codeforces | Codeforces Round #102 (Div. 1) & Codeforces Round #102 (Div. 2) | 5 | |
| 29 | Array and Operations | Codeforces | Codeforces Round #284 (Div. 1) & Codeforces Round #284 (Div. 2) | 5 | |
| 30 | Non-Secret Cypher | Codeforces | Codeforces Round #120 (Div. 2) | 6 | |
| 31 | Hamiltonian Spanning Tree | Codeforces | Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) | 6 | |
| 32 | Fox And Dinner | Codeforces | Codeforces Round #290 (Div. 2) & Codeforces Round #290 (Div. 1) | 6 | |
| 33 | WTF? | Codeforces | April Fools Day Contest 2013 | 6 | |
| 34 | Brevity is Soul of Wit | Codeforces | School Regional Team Contest, Saratov, 2011 | 7 | |
| 35 | George and Interesting Graph | Codeforces | Codeforces Round #227 (Div. 2) | 8 | |
| 36 | Antichain | Codeforces | Codeforces Round #205 (Div. 2) | 8 | |
| 37 | Tidying Up | Codeforces | ABBYY Cup 3.0 | 8 | |
| 38 | Traveling Graph | Codeforces | Codeforces Alpha Round #21 (Codeforces format) | 8 | |
| 39 | Birthday | Codeforces | Codeforces Round #327 (Div. 1) | 9 | |
| 40 | Shoe Store | Codeforces | Codeforces Round #113 (Div. 2) | 9 | |
| 41 | Deciphering | Codeforces | Testing Round #11 | 9 | |
| 42 | Buying Sets | Codeforces | Codeforces Beta Round #80 (Div. 1 Only) | 9 | |
| 43 | Tetris revisited | Codeforces | Yandex.Algorithm 2011 Round 2 | 9 | |
| 44 | Wizards and Roads | Codeforces | Codeforces Round #114 (Div. 1) | 10 | |
| 45 | Party | Codeforces | Bubble Cup 8 - Finals [Online Mirror] | 10 | |
| 46 | Sloth | Codeforces | Codeforces Round #446 (Div. 1) | 10 | |
| 47 | Recover a functional graph | Codeforces | Codeforces Round #381 (Div. 1) | 10 | |
| 48 | Fliperama | SPOJ Brazil | 10 | ||
| 49 | Permanent | Codeforces | Codeforces Round #268 (Div. 1) | 10 | |
| 50 | Tree | Codeforces | Codeforces Round #268 (Div. 1) | 10 |