| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Die Roll | Codeforces | Codeforces Beta Round #9 (Div. 2 Only) | 1 | |
| 2 | To the Max | PKU | 1 | ||
| 3 | Cows and Cars | UVA | 1 | ||
| 4 | Yanu in Movie theatre | SPOJ | 1 | ||
| 5 | Dreamoon and WiFi | Codeforces | Codeforces Round #272 (Div. 2) | 1 | |
| 6 | What is the Probability ? | UVA | 1 | ||
| 7 | Probability One | Live Archive | 2009 | Africa/Middle East - Africa and Arab | 1 |
| 8 | Counting Extra Stars | A2 Online Judge | 1 | ||
| 9 | Archer | Codeforces | Codeforces Round #185 (Div. 2) | 2 | |
| 10 | Collecting Bugs | PKU | 2 | ||
| 11 | Football | PKU | 2 | ||
| 12 | Check the difficulty of problems | PKU | 2 | ||
| 13 | One Person Game | ZOJ | 2 | ||
| 14 | Help Me Escape | ZOJ | 2 | ||
| 15 | Little Pony and Expected Maximum | Codeforces | Codeforces Round #259 (Div. 1) & Codeforces Round #259 (Div. 2) | 2 | |
| 16 | Dice Throwing | UVA | 2 | ||
| 17 | France '98 | UVA | 2 | ||
| 18 | Journey | Codeforces | Codeforces Round #428 (Div. 2) | 2 | |
| 19 | BirthdayOdds | TopCoder | SRM 174 - Div1 easy - Div2 medium] (4675) | 3 | |
| 20 | PipeCuts | TopCoder | SRM 233 - Div1 easy - Div2 medium] (6532) | 3 | |
| 21 | Coupons | UVA | 3 | ||
| 22 | Burger | UVA | 3 | ||
| 23 | Scout YYF I | PKU | 3 | ||
| 24 | Chocolate | PKU | 3 | ||
| 25 | ????? | PKU | 3 | ||
| 26 | Hats | UVA | 3 | ||
| 27 | Wet Shark and Flowers | Codeforces | Codeforces Round #341 (Div. 2) | 3 | |
| 28 | Ilya and Escalator | Codeforces | Codeforces Round #293 (Div. 2) | 3 | |
| 29 | Andrey and Problem | Codeforces | Codeforces Round #253 (Div. 1) & Codeforces Round #253 (Div. 2) | 3 | |
| 30 | Another lottery | UVA | 3 | ||
| 31 | So you want to be a 2n-aire? | UVA | 3 | ||
| 32 | PrimeSoccer | TopCoder | SRM 422 - Div1 easy - Div2 medium] (13513) | 3 | |
| 33 | FixedDiceGameDiv1 | TopCoder | SRM 626 - Div1 easy] (15859) | 3 | |
| 34 | PalindromicSubstringsDiv1 | TopCoder | Unknown () | 3 | |
| 35 | Bag of mice | Codeforces | Codeforces Round #105 (Div. 2) | 4 | |
| 36 | Vampires | UVA | 4 | ||
| 37 | God! Save me | UVA | 4 | ||
| 38 | Expect the Expected | UVA | 4 | ||
| 39 | Dumb Bones | UVA | 4 | ||
| 40 | Panda's Birthday Present | PKU | 4 | ||
| 41 | Patchouli's Spell Cards | ZOJ | 4 | ||
| 42 | Bad Luck Island | Codeforces | Codeforces Round #301 (Div. 2) | 4 | |
| 43 | Race to 1 | UVA | 4 | ||
| 44 | Probability | UVA | 4 | ||
| 45 | Winning Streak | UVA | 4 | ||
| 46 | Chocolate Box | UVA | 4 | ||
| 47 | Boastin' Red Socks | UVA | 4 | ||
| 48 | Urn-ball Probabilities! | UVA | 4 | ||
| 49 | MonstersAndBunnies | TopCoder | TCO08 Qual 1 - Div1 easy] (12007) | 4 | |
| 50 | Basketball Team | Codeforces | Codeforces Beta Round #83 (Div. 1 Only) & Codeforces Beta Round #83 (Div. 2 Only) | 5 | |
| 51 | Falling Anvils | Codeforces | Codeforces Beta Round #69 (Div. 1 Only) & Codeforces Beta Round #69 (Div. 2 Only) | 5 | |
| 52 | ProbabilityTree | TopCoder | SRM 174 - Div2 hard] (4675) | 5 | |
| 53 | ChessKnight | TopCoder | TCCC05 Round 1 - Div1 medium] (6528) | 5 | |
| 54 | Collision | TopCoder | SRM 153 - Div1 medium] (4570) | 5 | |
| 55 | Jerry's Protest | Codeforces | 8VC Venture Cup 2016 - Elimination Round | 5 | |
| 56 | Jeff and Furik | Codeforces | Codeforces Round #204 (Div. 1) & Codeforces Round #204 (Div. 2) | 5 | |
| 57 | Joining with Friend | UVA | 5 | ||
| 58 | Dragster | UVA | 5 | ||
| 59 | Lights inside a 3d Grid | UVA | 5 | ||
| 60 | Masud Rana | UVA | 5 | ||
| 61 | RandomSwaps | TopCoder | SRM 338 - Div1 medium] (10662) | 5 | |
| 62 | KthProbableElement | TopCoder | TCO09 Round 1 - Div1 medium] (13759) | 5 | |
| 63 | LotteryPyaterochka | TopCoder | SRM 466 - Div1 medium] (14150) | 5 | |
| 64 | RandomSort | TopCoder | SRM 402 - Div1 easy - Div2 hard] (12174) | 5 | |
| 65 | QuickSort | TopCoder | SRM 486 - Div1 medium] (14239) | 5 | |
| 66 | RedIsGood | TopCoder | SRM 420 - Div1 medium] (13511) | 5 | |
| 67 | TestBettingStrategy | TopCoder | SRM 339 - Div1 medium] (10663) | 5 | |
| 68 | CampaignTrail | TopCoder | TCO09 Round 3 - Div1 medium] (13761) | 5 | |
| 69 | PerfectMemory | TopCoder | SRM 513 - Div1 medium] (14538) | 5 | |
| 70 | CandyBox | TopCoder | SRM 462 - Div1 medium] (14147) | 5 | |
| 71 | TheFansAndMeetingsDivOne | TopCoder | SRM 460 - Div1 medium] (14146) | 5 | |
| 72 | DrawingLines | TopCoder | SRM 470 - Div1 medium] (14153) | 5 | |
| 73 | Let's Play Osu! | Codeforces | Codeforces Round #146 (Div. 1) & Codeforces Round #146 (Div. 2) | 6 | |
| 74 | Wizards and Huge Prize | Codeforces | Codeforces Round #114 (Div. 1) & Codeforces Round #114 (Div. 2) | 6 | |
| 75 | Lucky Probability | Codeforces | Codeforces Beta Round #84 (Div. 1 Only) & Codeforces Beta Round #84 (Div. 2 Only) | 6 | |
| 76 | Shooting Gallery | Codeforces | Codeforces Beta Round #30 (Codeforces format) | 6 | |
| 77 | Fish | Codeforces | Codeforces Beta Round #16 (Div. 2 Only) | 6 | |
| 78 | Join two kingdoms | UVA | 6 | ||
| 79 | ETS Problem setting | UVA | 6 | ||
| 80 | Magic Trick | Codeforces | MemSQL Start[c]UP 2.0 - Round 1 | 6 | |
| 81 | Map Generator | PKU | 6 | ||
| 82 | Chess Game | PKU | 6 | ||
| 83 | Second price auction | Codeforces | Rockethon 2015 | 6 | |
| 84 | Game on Tree | Codeforces | Codeforces Round #172 (Div. 1) & Codeforces Round #172 (Div. 2) | 6 | |
| 85 | Maxim and Restaurant | Codeforces | Codeforces Round #160 (Div. 1) & Codeforces Round #160 (Div. 2) | 6 | |
| 86 | Prisoners, Boxes and Pieces of Paper | UVA | 6 | ||
| 87 | AlternatingLane | TopCoder | Member SRM 494 - Div1 medium - Div2 hard] (14423) | 6 | |
| 88 | ZS and The Birthday Paradox | Codeforces | Codeforces Round #369 (Div. 2) | 6 | |
| 89 | Ada and Island | SPOJ | 6 | ||
| 90 | Little Elephant and Furik and Rubik | Codeforces | Codeforces Round #129 (Div. 1) & Codeforces Round #129 (Div. 2) | 7 | |
| 91 | Mushroom Gnomes - 2 | Codeforces | Codeforces Beta Round #99 (Div. 1) & Codeforces Beta Round #99 (Div. 2) | 7 | |
| 92 | Dark Assembly | Codeforces | Codeforces Beta Round #81 | 7 | |
| 93 | First Digit Law | Codeforces | Codeforces Beta Round #50 | 7 | |
| 94 | Playing War | UVA | 7 | ||
| 95 | Little Artem and Random Variable | Codeforces | VK Cup 2016 - Round 2 | 7 | |
| 96 | Famil Door and Roads | Codeforces | Codeforces Round #343 (Div. 2) | 7 | |
| 97 | Kleofáš and the n-thlon | Codeforces | Codeforces Round #333 (Div. 1) & Codeforces Round #333 (Div. 2) | 7 | |
| 98 | Name That Tune | Codeforces | Codeforces Round #284 (Div. 1) & Codeforces Round #284 (Div. 2) | 7 | |
| 99 | DZY Loves FFT | Codeforces | Codeforces Round #254 (Div. 1) & Codeforces Round #254 (Div. 2) | 7 | |
| 100 | Square Table | Codeforces | RCC 2014 Warmup (Div. 2) & RCC 2014 Warmup (Div. 1) | 7 | |
| 101 | Painting The Wall | Codeforces | Codeforces Round #233 (Div. 1) & Codeforces Round #233 (Div. 2) | 7 | |
| 102 | Playlist | Codeforces | Codeforces Round #164 (Div. 2) | 7 | |
| 103 | Dexterina’s Lab | Codeforces | Bubble Cup 9 - Finals [Online Mirror] | 7 | |
| 104 | Table Tennis | UVA | 7 | ||
| 105 | Garbage Remembering Exam | UVA | 7 | ||
| 106 | Gifts | Codeforces | Codeforces Round #142 (Div. 1) | 8 | |
| 107 | Smart Cheater | Codeforces | Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) | 8 | |
| 108 | Castle | Codeforces | Codeforces Beta Round #79 (Div. 1 Only) | 8 | |
| 109 | Petya and Tree | Codeforces | Yandex.Algorithm 2011 Round 1 | 8 | |
| 110 | Bombing | Codeforces | Codeforces Beta Round #47 | 8 | |
| 111 | Bath Queue | Codeforces | Codeforces Beta Round #28 (Codeforces format) | 8 | |
| 112 | Tickets | Codeforces | Codeforces Beta Round #26 (Codeforces format) | 8 | |
| 113 | Broken robot | Codeforces | Codeforces Beta Round #24 | 8 | |
| 114 | World of Darkraft - 2 | Codeforces | Codeforces Round #265 (Div. 1) | 8 | |
| 115 | Startup Funding | Codeforces | Manthan, Codefest 16 | 8 | |
| 116 | Intergalaxy Trips | Codeforces | Codeforces Round #335 (Div. 1) | 8 | |
| 117 | Wilbur and Trees | Codeforces | Codeforces Round #331 (Div. 2) | 8 | |
| 118 | Inversions problem | Codeforces | Rockethon 2015 | 8 | |
| 119 | Helping People | Codeforces | Codeforces Round #282 (Div. 1) & Codeforces Round #282 (Div. 2) | 8 | |
| 120 | Game with Strings | Codeforces | Codeforces Round #275 (Div. 1) & Codeforces Round #275 (Div. 2) | 8 | |
| 121 | Ghd | Codeforces | Codeforces Round #213 (Div. 1) | 8 | |
| 122 | Expecting Trouble | Codeforces | Friday the 13th, Programmers Day | 8 | |
| 123 | Little Elephant and Broken Sorting | Codeforces | Codeforces Round #157 (Div. 1) | 8 | |
| 124 | SPAM! (or not) | UVA | 8 | ||
| 125 | Fixing the Bugs | UVA | 8 | ||
| 126 | Destiny | Codeforces | Codeforces Round #429 (Div. 1) | 8 | |
| 127 | Willem, Chtholly and Seniorious | Codeforces | Codeforces Round #449 (Div. 1) & Codeforces Round #449 (Div. 2) | 8 | |
| 128 | Inversions After Shuffle | Codeforces | Codeforces Round #388 (Div. 2) | 8 | |
| 129 | Eyes Closed | Codeforces | Codeforces Round #448 (Div. 2) | 8 | |
| 130 | Memory and Casinos | Codeforces | Codeforces Round #370 (Div. 2) | 8 | |
| 131 | Piglet's Birthday | Codeforces | Codeforces Round #152 (Div. 2) & Codeforces Round #152 (Div. 1) | 9 | |
| 132 | T-shirt | Codeforces | Croc Champ 2012 - Final | 9 | |
| 133 | Plane of Tanks: Duel | Codeforces | Codeforces Round #115 | 9 | |
| 134 | Maze | Codeforces | Codeforces Beta Round #92 (Div. 1 Only) | 9 | |
| 135 | Museum | Codeforces | Codeforces Beta Round #86 (Div. 1 Only) | 9 | |
| 136 | Half-decay tree | Codeforces | Codeforces Beta Round #62 | 9 | |
| 137 | NestedRandomness | TopCoder | TCCC05 Qual 5 - Div1 hard] (6527) | 9 | |
| 138 | World of Darkraft | Codeforces | Codeforces Beta Round #99 (Div. 1) | 9 | |
| 139 | Gambling Nim | Codeforces | CROC 2016 - Final Round [Private, For Onsite Finalists Only] | 9 | |
| 140 | Birthday | Codeforces | AIM Tech Round (Div. 1) | 9 | |
| 141 | Randomizer | Codeforces | Codeforces Round #313 (Div. 1) | 9 | |
| 142 | Ksusha and Square | Codeforces | Croc Champ 2013 - Round 2 | 9 | |
| 143 | Google Code Jam | Codeforces | Codeforces Round #170 (Div. 1) | 9 | |
| 144 | Darts | Codeforces | Codeforces Beta Round #83 (Div. 1 Only) | 10 | |
| 145 | Help Shrek and Donkey | Codeforces | Codeforces Beta Round #78 (Div. 1 Only) | 10 | |
| 146 | Help King | Codeforces | Codeforces Beta Round #78 (Div. 1 Only) & Codeforces Beta Round #78 (Div. 2 Only) | 10 | |
| 147 | Rubik's Cube: 0-1 Version | PKU | 10 | ||
| 148 | Combining Slimes | Codeforces | Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) | 10 | |
| 149 | Kyoya and Train | Codeforces | Codeforces Round #309 (Div. 1) | 10 | |
| 150 | Bingo! | Codeforces | MemSQL Start[c]UP 2.0 - Round 2 | 10 | |
| 151 | DZY Loves Games | Codeforces | Codeforces Round #255 (Div. 1) | 10 | |
| 152 | Colored Jenga | Codeforces | Codeforces Round #242 (Div. 2) | 10 | |
| 153 | Counting Skyscrapers | Codeforces | MemSQL start[c]up Round 2 - online version | 10 |