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)
3750 Codeforces 883C: Downloading B++
3749 Codeforces 883B: Berland Army
3748 Codeforces 883A: Automatic Door
3747 Codeforces 879B: Table Tennis
3746 Codeforces 879A: Borya's Diagnosis
3745 Codeforces 878E: Numbers on the blackboard
3744 Codeforces 878D: Magic Breeding
3743 Codeforces 878C: Tournament
3742 Codeforces 878B: Teams Formation
3741 Codeforces 878A: Short Program
3740 Codeforces 877F: Ann and Books
3739 Codeforces 877E: Danil and a Part-time Job
3738 Codeforces 877D: Olya and Energy Drinks
3737 Codeforces 877C: Slava and tanks
3736 Codeforces 877B: Nikita and string
3735 Codeforces 877A: Alex and broken contest
3734 Codeforces 876B: Divisiblity of Differences
3733 Codeforces 876A: Trip For Meal
3732 Codeforces 875F: Royal Questions
3731 Codeforces 875E: Delivery Club
3730 Codeforces 875D: High Cry
3729 Codeforces 875C: National Property
3728 Codeforces 875B: Sorting the Coins
3727 Codeforces 875A: Classroom Watch
3726 Codeforces 873F: Forbidden Indices
3725 Codeforces 873E: Awards For Contestants
3724 Codeforces 873D: Merge Sort
3723 Codeforces 873C: Strange Game On Matrix
3722 Codeforces 873B: Balanced Substring
3721 Codeforces 873A: Chores
3720 Codeforces 871E: Restore the Tree
3719 Codeforces 870F: Paths
3718 Codeforces 870E: Points, Lines and Ready-made Titles
3717 Codeforces 870D: Something with XOR Queries
3716 Codeforces 870C: Maximum splitting
3715 Codeforces 870B: Maximum of Maximums of Minimums
3714 Codeforces 870A: Search for Pretty Integers
3713 Codeforces 869E: The Untended Antiquity
3712 Codeforces 869D: The Overdosing Ubiquity
3711 Codeforces 869C: The Intriguing Obsession
3710 Codeforces 869B: The Eternal Immortality
3709 Codeforces 869A: The Artful Expedient
3708 Codeforces 868G: El Toll Caves
3707 Codeforces 868F: Yet Another Minimization Problem
3706 Codeforces 868E: Policeman and a Tree
3705 Codeforces 868D: Huge Strings
3704 Codeforces 868C: Qualification Rounds
3703 Codeforces 868B: Race Against Time
3702 Codeforces 868A: Bark to Unlock
3701 Codeforces 867A: Between the Offices
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