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)
24947 Codeforces 1933C: Turtle Fingers: Count the Values of k
24946 Codeforces 1933B: Turtle Math: Fast Three Task
24945 Codeforces 1933A: Turtle Puzzle: Rearrange and Negate
24944 Codeforces 1932G: Moving Platforms
24943 Codeforces 1932F: Feed Cats
24942 Codeforces 1932E: Final Countdown
24941 Codeforces 1932D: Card Game
24940 Codeforces 1932C: LR-remainders
24939 Codeforces 1932B: Chaya Calendar
24938 Codeforces 1932A: Thorns and Coins
24937 Codeforces 1931G: One-Dimensional Puzzle
24936 Codeforces 1931F: Chat Screenshots
24935 Codeforces 1931E: Anna and the Valentine's Day Gift
24934 Codeforces 1931D: Divisible Pairs
24933 Codeforces 1931C: Make Equal Again
24932 Codeforces 1931B: Make Equal
24931 Codeforces 1931A: Recovering a Small String
24930 Codeforces 1930I: Counting Is Fun
24929 Codeforces 1930H: Interactive Mex Tree
24928 Codeforces 1930G: Prefix Max Set Counting
24927 Codeforces 1930F: Maximize the Difference
24926 Codeforces 1930E: 2..3...4.... Wonderful! Wonderful!
24925 Codeforces 1930D2: Sum over all Substrings (Hard Version)
24924 Codeforces 1930D1: Sum over all Substrings (Easy Version)
24923 Codeforces 1930C: Lexicographically Largest
24922 Codeforces 1930B: Permutation Printing
24921 Codeforces 1930A: Maximise The Score
24920 Codeforces 1929F: Sasha and the Wedding Binary Search Tree
24919 Codeforces 1929E: Sasha and the Happy Tree Cutting
24918 Codeforces 1929D: Sasha and a Walk in the City
24917 Codeforces 1929C: Sasha and the Casino
24916 Codeforces 1929B: Sasha and the Drawing
24915 Codeforces 1929A: Sasha and the Beautiful Array
24914 Codeforces 1928F: Digital Patterns
24913 Codeforces 1928E: Modular Sequence
24912 Codeforces 1928D: Lonely Mountain Dungeons
24911 Codeforces 1928C: Physical Education Lesson
24910 Codeforces 1928B: Equalize
24909 Codeforces 1928A: Rectangle Cutting
24908 Codeforces 1926G: Vlad and Trouble at MIT
24907 Codeforces 1926F: Vlad and Avoiding X
24906 Codeforces 1926E: Vlad and an Odd Ordering
24905 Codeforces 1926D: Vlad and Division
24904 Codeforces 1926C: Vlad and a Sum of Sum of Digits
24903 Codeforces 1926B: Vlad and Shapes
24902 Codeforces 1926A: Vlad and the Best of Five
24901 Codeforces 1923F: Shrink-Reverse
24900 Codeforces 1923E: Count Paths
24899 Codeforces 1923D: Slimes
24898 Codeforces 1923C: Find B
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