| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Increasing Subsequences | SPOJ | 1 | ||
| 2 | K-query | SPOJ | 1 | ||
| 3 | Matrix Summation | SPOJ | 1 | ||
| 4 | Yodaness Level | SPOJ | 1 | ||
| 5 | Number of Ways | Codeforces | Codeforces Round #266 (Div. 2) | 1 | |
| 6 | Assistance Required | SPOJ | 1 | ||
| 7 | Japan | SPOJ | 1 | ||
| 8 | Inversion Count | SPOJ | 1 | ||
| 9 | Jupiter Atacks! | Live Archive | 2011 | Latin America | 1 |
| 10 | Little Girl and Maximum Sum | Codeforces | Codeforces Round #169 (Div. 2) | 1 | |
| 11 | Ordering the Soldiers | SPOJ | 1 | ||
| 12 | Horrible Queries | SPOJ | 1 | ||
| 13 | Coder Ratings | SPOJ | 1 | ||
| 14 | Can you answer these queries IV | SPOJ | 1 | ||
| 15 | The day of the competitors | SPOJ | 1 | ||
| 16 | Update the array ! | SPOJ | 1 | ||
| 17 | Card Trick | SPOJ | 1 | ||
| 18 | Interval Product | Live Archive | 2012 | Latin America | 1 |
| 19 | Order statistic set | SPOJ | 1 | ||
| 20 | Bingo! | Live Archive | 2010 | Latin America | 1 |
| 21 | D-query | SPOJ | 1 | ||
| 22 | Gravel | CodeChef | 1 | ||
| 23 | WIND VANE | SPOJ | 2 | ||
| 24 | Greg and Array | Codeforces | Codeforces Round #179 (Div. 1) & Codeforces Round #179 (Div. 2) | 2 | |
| 25 | Interval Product | UVA | 2 | ||
| 26 | Potentiometers | UVA | 2 | ||
| 27 | Matrix | SPOJ | 2 | ||
| 28 | Fenwick Trees | SPOJ | 2 | ||
| 29 | Round-Robin Scheduling | SPOJ | 2 | ||
| 30 | IOI01 Mobiles | SPOJ | 2 | ||
| 31 | Thor | Codeforces | Codeforces Round #366 (Div. 1) & Codeforces Round #366 (Div. 2) | 2 | |
| 32 | Counting inversions | SPOJ | 2 | ||
| 33 | Chaos Strings | SPOJ | 2 | ||
| 34 | Karen and Coffee | Codeforces | Codeforces Round #419 (Div. 2) | 2 | |
| 35 | Meteors | SPOJ | 2 | ||
| 36 | Distinct Increasing Subsequences | SPOJ | 2 | ||
| 37 | Cvjetici | SPOJ | 2 | ||
| 38 | Pashmak and Parmida's problem | Codeforces | Codeforces Round #261 (Div. 2) | 3 | |
| 39 | New bricks disorder | SPOJ | 3 | ||
| 40 | Ping pong | UVA | 3 | ||
| 41 | UFOs | Timus | 3 | ||
| 42 | Above the Median | SPOJ Vietnam | 3 | ||
| 43 | Calculate The Cost | SPOJ | 3 | ||
| 44 | Salary Management | SPOJ | 3 | ||
| 45 | Team Selection | SPOJ | 3 | ||
| 46 | Chef and Swaps | CodeChef | 3 | ||
| 47 | Census | UVA | 3 | ||
| 48 | Queue (Pro) | SPOJ | 3 | ||
| 49 | Counting pairs | SPOJ | 4 | ||
| 50 | Cow Photographs | SPOJ | 4 | ||
| 51 | Movie collection | UVA | 4 | ||
| 52 | Propagating tree | Codeforces | Codeforces Round #225 (Div. 1) & Codeforces Round #225 (Div. 2) | 4 | |
| 53 | PolandBall and Polygon | Codeforces | 8VC Venture Cup 2017 - Elimination Round | 5 | |
| 54 | ``Dynamic'' Inversion | UVA | 5 | ||
| 55 | Balé | SPOJ Brazil | 5 | ||
| 56 | Tufurama | Codeforces | Educational Codeforces Round 41 (Rated for Div. 2) | 5 | |
| 57 | Mishka and Interesting sum | Codeforces | Codeforces Round #365 (Div. 2) | 5 | |
| 58 | Jupiter Atacks! | UVA | 5 | ||
| 59 | Pillars | Codeforces | Codeforces Round #271 (Div. 2) | 5 | |
| 60 | FloatingMedian | TopCoder | SRM 310 - Div1 medium - Div2 hard] (9990) | 6 | |
| 61 | Valera and Queries | Codeforces | Codeforces Round #216 (Div. 2) | 6 | |
| 62 | Sereja and Arcs | CodeChef | 6 | ||
| 63 | Infinite Inversions | Codeforces | Codeforces Round #301 (Div. 2) | 6 | |
| 64 | Dog Show | Codeforces | 2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest, qualification stage (Online Mirror, ACM-ICPC Rules, Teams Preferred) | 7 | |
| 65 | Count The Indexes 2 | SPOJ | 7 | ||
| 66 | Ambitious Experiment | Timus | 7 | ||
| 67 | George and Cards | Codeforces | Codeforces Round #227 (Div. 2) | 7 | |
| 68 | Júpiter Ataca! | SPOJ Brazil | 8 | ||
| 69 | Radio stations | Codeforces | Educational Codeforces Round 17 | 8 |