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)
400 Codeforces 76B: Mice
399 Codeforces 76A: Gift
398 Codeforces 75E: Ship's Shortest Path
397 Codeforces 75D: Big Maximum Sum
396 Codeforces 75C: Modified GCD
395 Codeforces 75B: Facetook Priority Wall
394 Codeforces 75A: Life Without Zeros
393 Codeforces 74E: Shift It!
392 Codeforces 74D: Hanger
391 Codeforces 74C: Chessboard Billiard
390 Codeforces 74B: Train
389 Codeforces 74A: Room Leader
388 Codeforces 73F: Plane of Tanks
387 Codeforces 73E: Morrowindows
386 Codeforces 73D: FreeDiv
385 Codeforces 73C: LionAge II
384 Codeforces 73B: Need For Brake
383 Codeforces 73A: The Elder Trolls IV: Oblivon
382 Codeforces 72I: Goofy Numbers
381 Codeforces 72H: Reverse It!
380 Codeforces 72G: Fibonacci army
379 Codeforces 72F: Oil
378 Codeforces 72E: Ali goes shopping
377 Codeforces 72D: Perse-script
376 Codeforces 72C: Extraordinarily Nice Numbers
375 Codeforces 72B: INI-file
374 Codeforces 72A: Goshtasp, Vishtasp and Eidi
373 Codeforces 71E: Nuclear Fusion
372 Codeforces 71D: Solitaire
371 Codeforces 71C: Round Table Knights
370 Codeforces 71B: Progress Bar
369 Codeforces 71A: Way Too Long Words
368 Codeforces 70E: Information Reform
367 Codeforces 70D: Professor's task
366 Codeforces 70C: Lucky Tickets
365 Codeforces 70B: Text Messaging
364 Codeforces 70A: Cookies
363 Codeforces 69E: Subsegments
362 Codeforces 69D: Dot
361 Codeforces 69C: Game
360 Codeforces 69B: Bets
359 Codeforces 69A: Young Physicist
358 Codeforces 68E: Contact
357 Codeforces 68D: Half-decay tree
356 Codeforces 68C: Synchrophasotron
355 Codeforces 68B: Energy exchange
354 Codeforces 68A: Irrational problem
353 Codeforces 67E: Save the City!
352 Codeforces 67D: Optical Experiment
351 Codeforces 67C: Sequence of Balls
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