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)
100 Codeforces 22D: Segments
99 Codeforces 22C: System Administrator
98 Codeforces 22B: Bargaining Table
97 Codeforces 22A: Second Order Statistics
96 Codeforces 21D: Traveling Graph
95 Codeforces 21C: Stripe 2
94 Codeforces 21B: Intersection
93 Codeforces 21A: Jabber ID
92 Codeforces 20C: Dijkstra?
91 Codeforces 20B: Equation
90 Codeforces 20A: BerOS file system
89 Codeforces 19E: Fairy
88 Codeforces 19D: Points
87 Codeforces 19C: Deletion of Repeats
86 Codeforces 19B: Checkout Assistant
85 Codeforces 19A: World Football Cup
84 Codeforces 18E: Flag 2
83 Codeforces 18D: Seller Bob
82 Codeforces 18C: Stripe
81 Codeforces 18B: Platforms
80 Codeforces 18A: Triangle
79 Codeforces 17E: Palisection
78 Codeforces 17D: Notepad
77 Codeforces 17C: Balance
76 Codeforces 17B: Hierarchy
75 Codeforces 17A: Noldbach problem
74 Codeforces 16E: Fish
73 Codeforces 16D: Logging
72 Codeforces 16C: Monitor
71 Codeforces 16B: Burglar and Matches
70 Codeforces 16A: Flag
69 Codeforces 15E: Triangles
68 Codeforces 15D: Map
67 Codeforces 15C: Industrial Nim
66 Codeforces 15B: Laser
65 Codeforces 15A: Cottage Village
64 Codeforces 14E: Camels
63 Codeforces 14D: Two Paths
62 Codeforces 14C: Four Segments
61 Codeforces 14B: Young Photographer
60 Codeforces 14A: Letter
59 Codeforces 13E: Holes
58 Codeforces 13D: Triangles
57 Codeforces 13C: Sequence
56 Codeforces 13B: Letter A
55 Codeforces 13A: Numbers
54 Codeforces 12E: Start of the session
53 Codeforces 12D: Ball
52 Codeforces 12C: Fruits
51 Codeforces 12B: Correct Solution?
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