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)
1600 Codeforces 362C: Insertion Sort
1599 Codeforces 362B: Petya and Staircases
1598 Codeforces 362A: Two Semiknights Meet
1597 Codeforces 361B: Levko and Permutation
1596 Codeforces 361A: Levko and Table
1595 Codeforces 360E: Levko and Game
1594 Codeforces 360D: Levko and Sets
1593 Codeforces 360C: Levko and Strings
1592 Codeforces 360B: Levko and Array
1591 Codeforces 360A: Levko and Array Recovery
1590 Codeforces 359E: Neatness
1589 Codeforces 359D: Pair of Numbers
1588 Codeforces 359C: Prime Number
1587 Codeforces 359B: Permutation
1586 Codeforces 359A: Table
1585 Codeforces 358E: Dima and Kicks
1584 Codeforces 358D: Dima and Hares
1583 Codeforces 358C: Dima and Containers
1582 Codeforces 358B: Dima and Text Messages
1581 Codeforces 358A: Dima and Continuous Line
1580 Codeforces 357B: Flag Day
1579 Codeforces 357A: Group of Students
1578 Codeforces 356E: Xenia and String Problem
1577 Codeforces 356D: Bags and Coins
1576 Codeforces 356C: Compartments
1575 Codeforces 356B: Xenia and Hamming
1574 Codeforces 356A: Knight Tournament
1573 Codeforces 355B: Vasya and Public Transport
1572 Codeforces 355A: Vasya and Digital Root
1571 Codeforces 354E: Lucky Number Representation
1570 Codeforces 354D: Transferring Pyramid
1569 Codeforces 354C: Vasya and Beautiful Arrays
1568 Codeforces 354B: Game with Strings
1567 Codeforces 354A: Vasya and Robot
1566 Codeforces 353E: Antichain
1565 Codeforces 353D: Queue
1564 Codeforces 353C: Find Maximum
1563 Codeforces 353B: Two Heaps
1562 Codeforces 353A: Domino
1561 Codeforces 352B: Jeff and Periods
1560 Codeforces 352A: Jeff and Digits
1559 Codeforces 351E: Jeff and Permutation
1558 Codeforces 351D: Jeff and Removing Periods
1557 Codeforces 351C: Jeff and Brackets
1556 Codeforces 351B: Jeff and Furik
1555 Codeforces 351A: Jeff and Rounding
1554 Codeforces 350E: Wrong Floyd
1553 Codeforces 350D: Looking for Owls
1552 Codeforces 350C: Bombs
1551 Codeforces 350B: Resort
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