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)
5450 Codeforces 1234A: Equalize Prices Again
5449 Codeforces 1231E: Middle-Out
5448 Codeforces 1231C: Increasing Matrix
5447 Codeforces 1230B: Ania and Minimizing
5446 Codeforces 1230A: Dawid and Bags of Candies
5445 Codeforces 1228F: One Node is Gone
5444 Codeforces 1228E: Another Filling the Grid
5443 Codeforces 1228D: Complete Tripartite
5442 Codeforces 1228C: Primes and Multiplication
5441 Codeforces 1228B: Filling the Grid
5440 Codeforces 1228A: Distinct Digits
5439 Codeforces 1227G: Not Same
5438 Codeforces 1227F2: Wrong Answer on test 233 (Hard Version)
5437 Codeforces 1227F1: Wrong Answer on test 233 (Easy Version)
5436 Codeforces 1227E: Arson In Berland Forest
5435 Codeforces 1227D2: Optimal Subsequences (Hard Version)
5434 Codeforces 1227D1: Optimal Subsequences (Easy Version)
5433 Codeforces 1227C: Messy
5432 Codeforces 1227B: Box
5431 Codeforces 1227A: Math Problem
5430 Codeforces 1225G: To Make 1
5429 Codeforces 1225F: Tree Factory
5428 Codeforces 1225E: Rock Is Push
5427 Codeforces 1225D: Power Products
5426 Codeforces 1225C: p-binary
5425 Codeforces 1225B2: TV Subscriptions (Hard Version)
5424 Codeforces 1225B1: TV Subscriptions (Easy Version)
5423 Codeforces 1225A: Forgetting Things
5422 Codeforces 1223G: Wooden Raft
5421 Codeforces 1223F: Stack Exterminable Arrays
5420 Codeforces 1223E: Paint the Tree
5419 Codeforces 1223D: Sequence Sorting
5418 Codeforces 1223C: Save the Nature
5417 Codeforces 1223B: Strings Equalization
5416 Codeforces 1223A: CME
5415 Codeforces 1221G: Graph And Numbers
5414 Codeforces 1221F: Choose a Square
5413 Codeforces 1221E: Game With String
5412 Codeforces 1221D: Make The Fence Great Again
5411 Codeforces 1221C: Perfect Team
5410 Codeforces 1221B: Knights
5409 Codeforces 1221A: 2048 Game
5408 Codeforces 1220G: Geolocation
5407 Codeforces 1220F: Gardener Alex
5406 Codeforces 1220E: Tourism
5405 Codeforces 1220D: Alex and Julian
5404 Codeforces 1220C: Substring Game in the Lesson
5403 Codeforces 1220B: Multiplication Table
5402 Codeforces 1220A: Cards
5401 Codeforces 1219G: Harvester
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