Starlight: List of Problems

Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

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)
19101	DMOJ Single Source Shortest Path
19100	DMOJ Secret Santa
19099	DMOJ Coding Spree
19098	DMOJ Bane of Arthropods
19097	DMOJ Special Relativity
19096	DMOJ Bob and Special Mud
19095	DMOJ Bubble Sort
19094	DMOJ SMAC 08/09 (Nov) #5 - Intelligent Stats
19093	DMOJ SMAC 08/09 (Nov) #4 - Infinite Degrees
19092	DMOJ SMAC 08/09 (Nov) #3 - Factor Game
19091	DMOJ SMAC 08/09 (Nov) #2 - Stock Market II
19090	DMOJ SMAC 08/09 (Nov) #1 - Befungulator
19089	DMOJ SMAC 08/09 (Oct) #5 - Crossroads
19088	DMOJ SMAC 08/09 (Oct) #4 - Daycare
19087	DMOJ SMAC 08/09 (Oct) #3 - Jumpscotch
19086	DMOJ SMAC 08/09 (Oct) #2 - Digging for Gold
19085	DMOJ SMAC 08/09 (Oct) #1 - Eliminanagram
19084	DMOJ Sleigh Ride
19083	DMOJ Skyscrapers
19082	DMOJ A Simple Game
19081	DMOJ Summer Institute '17 Contest 3 P5 - Balanced Cycles
19080	DMOJ Summer Institute '17 Contest 3 P4 - Customs
19079	DMOJ Summer Institute '17 Contest 1 P9 - Safe Square
19078	DMOJ Summer Institute '17 Contest 1 P8 - Mo' Money
19077	DMOJ Summer Institute '17 Contest 1 P7 - Grand Theft Otto
19076	DMOJ Summer Institute '17 Contest 1 P6 - Fortunate Farmland
19075	DMOJ Summer Institute '17 Contest 1 P5 - Crazy Math
19074	DMOJ Summer Institute '17 Contest 1 P4 - Clips of Video
19073	DMOJ Summer Institute '17 Contest 1 P3 - CEO Queue
19072	DMOJ Summer Institute '17 Contest 1 P2 - Bernard
19071	DMOJ Summer Institute '17 Contest 1 P10 - Trading Cards
19070	DMOJ Summer Institute '17 Contest 1 P1 - Ant Clans
19069	DMOJ Python Infinite Loop
19068	DMOJ SGS Programming Challenge P5 - Tree After School
19067	DMOJ SGS Programming Challenge P4 - Toy in Psychology Class
19066	DMOJ SGS Programming Challenge P3 - Tree in Biology Class
19065	DMOJ SGS Programming Challenge P2 - Vending Machine in Lunch
19064	DMOJ SGS Programming Challenge P1 - XOR in Computer Class
19063	DMOJ Unique Elements
19062	DMOJ Creating a Sequence
19061	DMOJ Jason's Theorem
19060	DMOJ Summing A Sequence
19059	DMOJ Geometric Sequence
19058	DMOJ Dynamic Range Minimum Test
19057	DMOJ Touching Segments
19056	DMOJ The Cosmic Era P5 - GENESIS
19055	DMOJ The Cosmic Era P4 - Freedom Appears!
19054	DMOJ The Cosmic Era P3 - Battle Positions
19053	DMOJ The Cosmic Era P2 - Uneven Sand
19052	DMOJ The Cosmic Era P1 - Ship

Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)

19101

DMOJ Single Source Shortest Path

19100

DMOJ Secret Santa

19099

DMOJ Coding Spree

19098

DMOJ Bane of Arthropods

19097

DMOJ Special Relativity

19096