Starlight

Over 20,000 problems available: AMC 8/10/12 and AIME problems from 2010-2024; USAJMO/USAMO problems from 2002-2024; USACO problems from 2014 to 2024 (all divisions); all Codeforces, AtCoder and DMOJ problems. If you leave the search field blank, it returns all problems with the specified type.

Reset

Need help searching? Click for format/examples of problems
  • AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
  • AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
  • AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
  • AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
  • USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
  • Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
  • AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
  • DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
  • USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
3650 Codeforces 855C: Helga Hufflepuff's Cup
3649 Codeforces 855B: Marvolo Gaunt's Ring
3648 Codeforces 855A: Tom Riddle's Diary
3647 Codeforces 854B: Maxim Buys an Apartment
3646 Codeforces 854A: Fraction
3645 Codeforces 853E: Lada Malina
3644 Codeforces 853D: Michael and Charging Stations
3643 Codeforces 853C: Boredom
3642 Codeforces 853B: Jury Meeting
3641 Codeforces 853A: Planning
3640 Codeforces 852I: Dating
3639 Codeforces 852H: Bob and stages
3638 Codeforces 852G: Bathroom terminal
3637 Codeforces 852F: Product transformation
3636 Codeforces 852E: Casinos and travel
3635 Codeforces 852D: Exploration plan
3634 Codeforces 852C: Property
3633 Codeforces 852B: Neural Network country
3632 Codeforces 852A: Digits
3631 Codeforces 851B: Arpa and an exam about geometry
3630 Codeforces 851A: Arpa and a research in Mexican wave
3629 Codeforces 850F: Rainbow Balls
3628 Codeforces 850E: Random Elections
3627 Codeforces 850D: Tournament Construction
3626 Codeforces 850C: Arpa and a game with Mojtaba
3625 Codeforces 850B: Arpa and a list of numbers
3624 Codeforces 850A: Five Dimensional Points
3623 Codeforces 849B: Tell Your World
3622 Codeforces 849A: Odds and Ends
3621 Codeforces 848E: Days of Floral Colours
3620 Codeforces 848D: Shake It!
3619 Codeforces 848C: Goodbye Souvenir
3618 Codeforces 848B: Rooter's Song
3617 Codeforces 848A: From Y to Y
3616 Codeforces 847M: Weather Tomorrow
3615 Codeforces 847L: Berland SU Computer Network
3614 Codeforces 847K: Travel Cards
3613 Codeforces 847J: Students Initiation
3612 Codeforces 847I: Noise Level
3611 Codeforces 847H: Load Testing
3610 Codeforces 847G: University Classes
3609 Codeforces 847F: Berland Elections
3608 Codeforces 847E: Packmen
3607 Codeforces 847D: Dog Show
3606 Codeforces 847C: Sum of Nestings
3605 Codeforces 847B: Preparing for Merge Sort
3604 Codeforces 847A: Union of Doubly Linked Lists
3603 Codeforces 846F: Random Query
3602 Codeforces 846E: Chemistry in Berland
3601 Codeforces 846D: Monitor
View links to all pages 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192

About • Privacy Notice • Rules • Problems list • Journal • Your profile • GitHub

Moon Symbol icon by Icons8 • Sun icon by Icons8 • Emojis from Twemoji by Twitter under CC by 4.0