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)
2000 Codeforces 463E: Caisa and Tree
1999 Codeforces 463D: Gargari and Permutations
1998 Codeforces 463C: Gargari and Bishops
1997 Codeforces 463B: Caisa and Pylons
1996 Codeforces 463A: Caisa and Sugar
1995 Codeforces 462B: Appleman and Card Game
1994 Codeforces 462A: Appleman and Easy Task
1993 Codeforces 461E: Appleman and a Game
1992 Codeforces 461D: Appleman and Complicated Task
1991 Codeforces 461C: Appleman and a Sheet of Paper
1990 Codeforces 461B: Appleman and Tree
1989 Codeforces 461A: Appleman and Toastman
1988 Codeforces 460E: Roland and Rose
1987 Codeforces 460D: Little Victor and Set
1986 Codeforces 460C: Present
1985 Codeforces 460B: Little Dima and Equation
1984 Codeforces 460A: Vasya and Socks
1983 Codeforces 459E: Pashmak and Graph
1982 Codeforces 459D: Pashmak and Parmida's problem
1981 Codeforces 459C: Pashmak and Buses
1980 Codeforces 459B: Pashmak and Flowers
1979 Codeforces 459A: Pashmak and Garden
1978 Codeforces 457F: An easy problem about trees
1977 Codeforces 457E: Flow Optimality
1976 Codeforces 457D: Bingo!
1975 Codeforces 457C: Elections
1974 Codeforces 457B: Distributed Join
1973 Codeforces 457A: Golden System
1972 Codeforces 456B: Fedya and Maths
1971 Codeforces 456A: Laptops
1970 Codeforces 455E: Function
1969 Codeforces 455D: Serega and Fun
1968 Codeforces 455C: Civilization
1967 Codeforces 455B: A Lot of Games
1966 Codeforces 455A: Boredom
1965 Codeforces 454B: Little Pony and Sort by Shift
1964 Codeforces 454A: Little Pony and Crystal Mine
1963 Codeforces 453E: Little Pony and Lord Tirek
1962 Codeforces 453D: Little Pony and Elements of Harmony
1961 Codeforces 453C: Little Pony and Summer Sun Celebration
1960 Codeforces 453B: Little Pony and Harmony Chest
1959 Codeforces 453A: Little Pony and Expected Maximum
1958 Codeforces 452F: Permutation
1957 Codeforces 452E: Three strings
1956 Codeforces 452D: Washer, Dryer, Folder
1955 Codeforces 452C: Magic Trick
1954 Codeforces 452B: 4-point polyline
1953 Codeforces 452A: Eevee
1952 Codeforces 451E: Devu and Flowers
1951 Codeforces 451D: Count Good Substrings
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