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)
3250 Codeforces 765F: Souvenirs
3249 Codeforces 765E: Tree Folding
3248 Codeforces 765D: Artsem and Saunders
3247 Codeforces 765C: Table Tennis Game 2
3246 Codeforces 765B: Code obfuscation
3245 Codeforces 765A: Neverending competitions
3244 Codeforces 764B: Timofey and cubes
3243 Codeforces 764A: Taymyr is calling you
3242 Codeforces 763E: Timofey and our friends animals
3241 Codeforces 763D: Timofey and a flat tree
3240 Codeforces 763C: Timofey and remoduling
3239 Codeforces 763B: Timofey and rectangles
3238 Codeforces 763A: Timofey and a tree
3237 Codeforces 762F: Tree nesting
3236 Codeforces 762E: Radio stations
3235 Codeforces 762D: Maximum path
3234 Codeforces 762C: Two strings
3233 Codeforces 762B: USB vs. PS/2
3232 Codeforces 762A: k-th divisor
3231 Codeforces 761F: Dasha and Photos
3230 Codeforces 761E: Dasha and Puzzle
3229 Codeforces 761D: Dasha and Very Difficult Problem
3228 Codeforces 761C: Dasha and Password
3227 Codeforces 761B: Dasha and friends
3226 Codeforces 761A: Dasha and Stairs
3225 Codeforces 760B: Frodo and pillows
3224 Codeforces 760A: Petr and a calendar
3223 Codeforces 758F: Geometrical Progression
3222 Codeforces 758E: Broken Tree
3221 Codeforces 758D: Ability To Convert
3220 Codeforces 758C: Unfair Poll
3219 Codeforces 758B: Blown Garland
3218 Codeforces 758A: Holiday Of Equality
3217 Codeforces 757G: Can Bash Save the Day?
3216 Codeforces 757F: Team Rocket Rises Again
3215 Codeforces 757E: Bash Plays with Functions
3214 Codeforces 757D: Felicity's Big Secret Revealed
3213 Codeforces 757C: Felicity is Coming!
3212 Codeforces 757B: Bash's Big Day
3211 Codeforces 757A: Gotta Catch Em' All!
3210 Codeforces 756F: Long number
3209 Codeforces 756E: Byteland coins
3208 Codeforces 756D: Bacterial Melee
3207 Codeforces 756C: Nikita and stack
3206 Codeforces 756B: Travel Card
3205 Codeforces 756A: Pavel and barbecue
3204 Codeforces 755G: PolandBall and Many Other Balls
3203 Codeforces 755F: PolandBall and Gifts
3202 Codeforces 755E: PolandBall and White-Red graph
3201 Codeforces 755D: PolandBall and Polygon
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