| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | ABCDEF | SPOJ | 1 | ||
| 2 | 4 Values whose Sum is 0 | TJU | 1 | ||
| 3 | Subset Sums | SPOJ | 1 | ||
| 4 | 4 values whose sum is 0 | SPOJ | 1 | ||
| 5 | 4 Values whose Sum is 0 | Live Archive | 2005 | Europe - Southwestern | 1 |
| 6 | Solitaire | SPOJ | 2 | ||
| 7 | Drazil and His Happy Friends | Codeforces | Codeforces Round #292 (Div. 1) & Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) & Codeforces Round #292 (Div. 2) | 2 | |
| 8 | Robbing Gringotts | Live Archive | 2011 | Asia - Amritapuri | 2 |
| 9 | The Morning after Halloween | Live Archive | 2007 | Asia - Tokyo | 3 |
| 10 | Vanya and Scales | Codeforces | Codeforces Round #308 (Div. 2) | 3 | |
| 11 | Face the mate | SPOJ | 4 | ||
| 12 | Parity | SPOJ | 5 | ||
| 13 | Inversions problem | Codeforces | Rockethon 2015 | 5 | |
| 14 | Maximum Subsequence | Codeforces | Educational Codeforces Round 32 | 5 | |
| 15 | Chocolate | Codeforces | Codeforces Round #279 (Div. 2) | 5 | |
| 16 | Golden System | Codeforces | MemSQL Start[c]UP 2.0 - Round 2 | 6 | |
| 17 | Anya and Cubes | Codeforces | Codeforces Round #297 (Div. 2) | 6 | |
| 18 | Permutation Sum | Codeforces | Codeforces Round #175 (Div. 2) | 6 | |
| 19 | Maximal Independent Set | SPOJ | 6 | ||
| 20 | Event Dates | Codeforces | School Team Contest #3 (Winter Computer School 2010/11) | 7 | |
| 21 | Lizard Era: Beginning | Codeforces | Codeforces Round #325 (Div. 1) & Codeforces Round #325 (Div. 2) | 7 | |
| 22 | Axis Walking | Codeforces | Codeforces Round #191 (Div. 2) | 7 | |
| 23 | EllysBulls | TopCoder | SRM 572 - Div1 medium] (15492) | 7 | |
| 24 | Mother of Dragons | Codeforces | Codeforces Round #428 (Div. 2) | 8 | |
| 25 | The Morning after Halloween | TJU | 8 | ||
| 26 | Simplified Nonogram | Codeforces | Codeforces Round #298 (Div. 2) | 9 | |
| 27 | Missing Piece 2001 | TJU | 9 | ||
| 28 | Permanent | Codeforces | Codeforces Round #268 (Div. 1) | 10 | |
| 29 | Wavy numbers | Codeforces | Codeforces Round #273 (Div. 2) | 10 |