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)
19033 DMOJ SAC '22 Code Challenge 5 P3 - Querying Presents
19032 DMOJ SAC '22 Code Challenge 5 P2 - Querying Extensions
19031 DMOJ SAC '22 Code Challenge 5 P1 - Querying Plants
19030 DMOJ SAC '22 Code Challenge 5 Junior P5 - English Summative
19029 DMOJ SAC '22 Code Challenge 5 Junior P4 - Course Requirements
19028 DMOJ SAC '22 Code Challenge 5 Junior P3 - Media List
19027 DMOJ SAC '22 Code Challenge 5 Junior P2 - Badminton Scoring
19026 DMOJ SAC '22 Code Challenge 5 Junior P1 - Monkey, Type!
19025 DMOJ SAC '22 Code Challenge 4 P5 - Obligatory Interactive Problem
19024 DMOJ SAC '22 Code Challenge 4 P4 - Obligatory Subarray Problem
19023 DMOJ SAC '22 Code Challenge 4 P3 - Obligatory Math Problem
19022 DMOJ SAC '22 Code Challenge 4 P2 - Obligatory String Problem
19021 DMOJ SAC '22 Code Challenge 4 P1 - Obligatory Car Problem
19020 DMOJ SAC '22 Code Challenge 4 Junior P5 - Obligatory Output Only Problem
19019 DMOJ SAC '22 Code Challenge 4 Junior P4 - Obligatory Permutation Problem
19018 DMOJ SAC '22 Code Challenge 4 Junior P3 - Obligatory Triangle Problem
19017 DMOJ SAC '22 Code Challenge 4 Junior P2 - Obligatory Geometry Problem
19016 DMOJ SAC '22 Code Challenge 4 Junior P1 - Obligatory DeMello Problem
19015 DMOJ SAC '22 Code Challenge 3 P5 - Chat Corrections
19014 DMOJ SAC '22 Code Challenge 3 P4 - Finding Friends
19013 DMOJ SAC '22 Code Challenge 3 P3 - Bob Sort
19012 DMOJ SAC '22 Code Challenge 3 P2 - Unicycle License
19011 DMOJ SAC '22 Code Challenge 3 P1 - Hair Hazards
19010 DMOJ SAC '22 Code Challenge 3 Junior P5 - Normal Encoding
19009 DMOJ SAC '22 Code Challenge 3 Junior P4 - Normal Conversions
19008 DMOJ SAC '22 Code Challenge 3 Junior P3 - Normal Probabilities
19007 DMOJ SAC '22 Code Challenge 3 Junior P2 - Normal Lines
19006 DMOJ SAC '22 Code Challenge 3 Junior P1 - Normal Problem
19005 DMOJ SAC '22 Code Challenge 2 P5 - Even Colouring
19004 DMOJ SAC '22 Code Challenge 2 P4 - Cookie Galore
19003 DMOJ SAC '22 Code Challenge 2 P3 - Rating Choices
19002 DMOJ SAC '22 Code Challenge 2 P2 - Cookie Sprinkler
19001 DMOJ SAC '22 Code Challenge 2 P1 - Calendar Management
19000 DMOJ SAC '22 Code Challenge 1 P5 - That Wall
18999 DMOJ SAC '22 Code Challenge 1 P4 - That Problem
18998 DMOJ SAC '22 Code Challenge 1 P3 - That Pool
18997 DMOJ SAC '22 Code Challenge 1 P2 - That Circle
18996 DMOJ SAC '22 Code Challenge 1 P1 - That Teacher
18995 DMOJ SAC '21 Code Challenge P5 - Friends of Friends
18994 DMOJ SAC '21 Code Challenge P4 - Averaging Averages
18993 DMOJ SAC '21 Code Challenge P3 - DeMello's Replacement
18992 DMOJ SAC '21 Code Challenge P2 - Littering
18991 DMOJ SAC '21 Code Challenge P1 - Shrinkage
18990 DMOJ Rule of Lemons
18989 DMOJ Ancient Castle Ruins
18988 DMOJ Rubik's Cube Solver
18987 DMOJ RTE '16 S3 - School Traversal
18986 DMOJ RTE '16 S2 - Fire Evacuation Plan
18985 DMOJ RTE '16 S1 - Battery Pyramids
18984 DMOJ RTE '16 J3 - Mule Wars
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

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