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)
7750 Codeforces 1674E: Breaking the Wall
7749 Codeforces 1674D: A-B-C Sort
7748 Codeforces 1674C: Infinite Replacement
7747 Codeforces 1674B: Dictionary
7746 Codeforces 1674A: Number Transformation
7745 Codeforces 1673F: Anti-Theft Road Planning
7744 Codeforces 1673E: Power or XOR?
7743 Codeforces 1673D: Lost Arithmetic Progression
7742 Codeforces 1673C: Palindrome Basis
7741 Codeforces 1673B: A Perfectly Balanced String?
7740 Codeforces 1673A: Subtle Substring Subtraction
7739 Codeforces 1672I: PermutationForces
7738 Codeforces 1672H: Zigu Zagu
7737 Codeforces 1672G: Cross Xor
7736 Codeforces 1672F2: Checker for Array Shuffling
7735 Codeforces 1672F1: Array Shuffling
7734 Codeforces 1672E: notepad.exe
7733 Codeforces 1672D: Cyclic Rotation
7732 Codeforces 1672C: Unequal Array
7731 Codeforces 1672B: I love AAAB
7730 Codeforces 1672A: Log Chopping
7729 Codeforces 1671F: Permutation Counting
7728 Codeforces 1671E: Preorder
7727 Codeforces 1671D: Insert a Progression
7726 Codeforces 1671C: Dolce Vita
7725 Codeforces 1671B: Consecutive Points Segment
7724 Codeforces 1671A: String Building
7723 Codeforces 1670F: Jee, You See?
7722 Codeforces 1670E: Hemose on the Tree
7721 Codeforces 1670D: Very Suspicious
7720 Codeforces 1670C: Where is the Pizza?
7719 Codeforces 1670B: Dorms War
7718 Codeforces 1670A: Prof. Slim
7717 Codeforces 1669H: Maximal AND
7716 Codeforces 1669G: Fall Down
7715 Codeforces 1669F: Eating Candies
7714 Codeforces 1669E: 2-Letter Strings
7713 Codeforces 1669D: Colorful Stamp
7712 Codeforces 1669C: Odd/Even Increments
7711 Codeforces 1669B: Triple
7710 Codeforces 1669A: Division?
7709 Codeforces 1668B: Social Distance
7708 Codeforces 1668A: Direction Change
7707 Codeforces 1667F: Yin Yang
7706 Codeforces 1667E: Centroid Probabilities
7705 Codeforces 1667D: Edge Elimination
7704 Codeforces 1667C: Half Queen Cover
7703 Codeforces 1667B: Optimal Partition
7702 Codeforces 1667A: Make it Increasing
7701 Codeforces 1666L: Labyrinth
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