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)
2550 Codeforces 602A: Two Bases
2549 Codeforces 601E: A Museum Robbery
2548 Codeforces 601D: Acyclic Organic Compounds
2547 Codeforces 601C: Kleofáš and the n-thlon
2546 Codeforces 601B: Lipshitz Sequence
2545 Codeforces 601A: The Two Routes
2544 Codeforces 600F: Edge coloring of bipartite graph
2543 Codeforces 600E: Lomsat gelral
2542 Codeforces 600D: Area of Two Circles' Intersection
2541 Codeforces 600C: Make Palindrome
2540 Codeforces 600B: Queries about less or equal elements
2539 Codeforces 600A: Extract Numbers
2538 Codeforces 599E: Sandy and Nuts
2537 Codeforces 599D: Spongebob and Squares
2536 Codeforces 599C: Day at the Beach
2535 Codeforces 599B: Spongebob and Joke
2534 Codeforces 599A: Patrick and Shopping
2533 Codeforces 598F: Cut Length
2532 Codeforces 598E: Chocolate Bar
2531 Codeforces 598D: Igor In the Museum
2530 Codeforces 598C: Nearest vectors
2529 Codeforces 598B: Queries on a String
2528 Codeforces 598A: Tricky Sum
2527 Codeforces 597C: Subsequences
2526 Codeforces 597B: Restaurant
2525 Codeforces 597A: Divisibility
2524 Codeforces 596E: Wilbur and Strings
2523 Codeforces 596D: Wilbur and Trees
2522 Codeforces 596C: Wilbur and Points
2521 Codeforces 596B: Wilbur and Array
2520 Codeforces 596A: Wilbur and Swimming Pool
2519 Codeforces 595B: Pasha and Phone
2518 Codeforces 595A: Vitaly and Night
2517 Codeforces 594E: Cutting the Line
2516 Codeforces 594D: REQ
2515 Codeforces 594C: Edo and Magnets
2514 Codeforces 594B: Max and Bike
2513 Codeforces 594A: Warrior and Archer
2512 Codeforces 593E: Strange Calculation and Cats
2511 Codeforces 593D: Happy Tree Party
2510 Codeforces 593C: Beautiful Function
2509 Codeforces 593B: Anton and Lines
2508 Codeforces 593A: 2Char
2507 Codeforces 592E: BCPC
2506 Codeforces 592D: Super M
2505 Codeforces 592C: The Big Race
2504 Codeforces 592B: The Monster and the Squirrel
2503 Codeforces 592A: PawnChess
2502 Codeforces 591B: Rebranding
2501 Codeforces 591A: Wizards' Duel
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