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)
6050 Codeforces 1356A1: Distinguish I from X
6049 Codeforces 1355F: Guess Divisors Count
6048 Codeforces 1355E: Restorer Distance
6047 Codeforces 1355D: Game With Array
6046 Codeforces 1355C: Count Triangles
6045 Codeforces 1355B: Young Explorers
6044 Codeforces 1355A: Sequence with Digits
6043 Codeforces 1354G: Find a Gift
6042 Codeforces 1354F: Summoning Minions
6041 Codeforces 1354E: Graph Coloring
6040 Codeforces 1354D: Multiset
6039 Codeforces 1354C2: Not So Simple Polygon Embedding
6038 Codeforces 1354C1: Simple Polygon Embedding
6037 Codeforces 1354B: Ternary String
6036 Codeforces 1354A: Alarm Clock
6035 Codeforces 1353F: Decreasing Heights
6034 Codeforces 1353E: K-periodic Garland
6033 Codeforces 1353D: Constructing the Array
6032 Codeforces 1353C: Board Moves
6031 Codeforces 1353B: Two Arrays And Swaps
6030 Codeforces 1353A: Most Unstable Array
6029 Codeforces 1352G: Special Permutation
6028 Codeforces 1352F: Binary String Reconstruction
6027 Codeforces 1352E: Special Elements
6026 Codeforces 1352D: Alice, Bob and Candies
6025 Codeforces 1352C: K-th Not Divisible by n
6024 Codeforces 1352B: Same Parity Summands
6023 Codeforces 1352A: Sum of Round Numbers
6022 Codeforces 1351C: Skier
6021 Codeforces 1351B: Square?
6020 Codeforces 1351A: A+B (Trial Problem)
6019 Codeforces 1350B: Orac and Models
6018 Codeforces 1350A: Orac and Factors
6017 Codeforces 1349F2: Slime and Sequences (Hard Version)
6016 Codeforces 1349F1: Slime and Sequences (Easy Version)
6015 Codeforces 1349E: Slime and Hats
6014 Codeforces 1349D: Slime and Biscuits
6013 Codeforces 1349C: Orac and Game of Life
6012 Codeforces 1349B: Orac and Medians
6011 Codeforces 1349A: Orac and LCM
6010 Codeforces 1348F: Phoenix and Memory
6009 Codeforces 1348E: Phoenix and Berries
6008 Codeforces 1348D: Phoenix and Science
6007 Codeforces 1348C: Phoenix and Distribution
6006 Codeforces 1348B: Phoenix and Beauty
6005 Codeforces 1348A: Phoenix and Balance
6004 Codeforces 1346I: Pac-Man 2.0
6003 Codeforces 1346H: Game with Segments
6002 Codeforces 1346G: Two IP Cameras
6001 Codeforces 1346F: Dune II: Battle For Arrakis
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