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)
6000 Codeforces 1346E: Magic Tricks
5999 Codeforces 1346D: Constructing the Dungeon
5998 Codeforces 1346C: Spring Cleaning
5997 Codeforces 1346B: Boot Camp
5996 Codeforces 1346A: Color Revolution
5995 Codeforces 1345B: Card Constructions
5994 Codeforces 1345A: Puzzle Pieces
5993 Codeforces 1344F: Piet's Palette
5992 Codeforces 1344E: Train Tracks
5991 Codeforces 1344D: Résumé Review
5990 Codeforces 1344C: Quantifier Question
5989 Codeforces 1344B: Monopole Magnets
5988 Codeforces 1344A: Hilbert's Hotel
5987 Codeforces 1343F: Restore the Permutation by Sorted Segments
5986 Codeforces 1343E: Weights Distributing
5985 Codeforces 1343D: Constant Palindrome Sum
5984 Codeforces 1343C: Alternating Subsequence
5983 Codeforces 1343B: Balanced Array
5982 Codeforces 1343A: Candies
5981 Codeforces 1342F: Make It Ascending
5980 Codeforces 1342E: Placing Rooks
5979 Codeforces 1342D: Multiple Testcases
5978 Codeforces 1342C: Yet Another Counting Problem
5977 Codeforces 1342B: Binary Period
5976 Codeforces 1342A: Road To Zero
5975 Codeforces 1341B: Nastya and Door
5974 Codeforces 1341A: Nastya and Rice
5973 Codeforces 1340F: Nastya and CBS
5972 Codeforces 1340E: Nastya and Bees
5971 Codeforces 1340D: Nastya and Time Machine
5970 Codeforces 1340C: Nastya and Unexpected Guest
5969 Codeforces 1340B: Nastya and Scoreboard
5968 Codeforces 1340A: Nastya and Strange Generator
5967 Codeforces 1339B: Sorted Adjacent Differences
5966 Codeforces 1339A: Filling Diamonds
5965 Codeforces 1338E: JYPnation
5964 Codeforces 1338D: Nested Rubber Bands
5963 Codeforces 1338C: Perfect Triples
5962 Codeforces 1338B: Edge Weight Assignment
5961 Codeforces 1338A: Powered Addition
5960 Codeforces 1337B: Kana and Dragon Quest game
5959 Codeforces 1337A: Ichihime and Triangle
5958 Codeforces 1336F: Journey
5957 Codeforces 1336E2: Chiori and Doll Picking (hard version)
5956 Codeforces 1336E1: Chiori and Doll Picking (easy version)
5955 Codeforces 1336D: Yui and Mahjong Set
5954 Codeforces 1336C: Kaavi and Magic Spell
5953 Codeforces 1336B: Xenia and Colorful Gems
5952 Codeforces 1336A: Linova and Kingdom
5951 Codeforces 1335F: Robots on a Grid
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