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.

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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)
17301	DMOJ Educational DP Contest AtCoder Z - Frog 3
17300	DMOJ Educational DP Contest AtCoder Y - Grid 2
17299	DMOJ Educational DP Contest AtCoder X - Tower
17298	DMOJ Educational DP Contest AtCoder W - Intervals
17297	DMOJ Educational DP Contest AtCoder V - Subtree
17296	DMOJ Educational DP Contest AtCoder U - Grouping
17295	DMOJ Educational DP Contest AtCoder T - Permutation
17294	DMOJ Educational DP Contest AtCoder S - Digit Sum
17293	DMOJ Deemo's Problem
17292	DMOJ Educational DP Contest AtCoder R - Walk
17291	DMOJ Educational DP Contest AtCoder Q - Flowers
17290	DMOJ Educational DP Contest AtCoder P - Independent Set
17289	DMOJ Educational DP Contest AtCoder O - Matching
17288	DMOJ Educational DP Contest AtCoder N - Slimes
17287	DMOJ Educational DP Contest AtCoder M - Candies
17286	DMOJ Educational DP Contest AtCoder L - Deque
17285	DMOJ Educational DP Contest AtCoder K - Stones
17284	DMOJ Educational DP Contest AtCoder J - Sushi
17283	DMOJ Educational DP Contest AtCoder I - Coins
17282	DMOJ Educational DP Contest AtCoder H - Grid 1
17281	DMOJ Educational DP Contest AtCoder G - Longest Path
17280	DMOJ Educational DP Contest AtCoder F - LCS
17279	DMOJ Educational DP Contest AtCoder E - Knapsack 2
17278	DMOJ Educational DP Contest AtCoder D - Knapsack 1
17277	DMOJ Educational DP Contest AtCoder C - Vacation
17276	DMOJ Educational DP Contest AtCoder B - Frog 2
17275	DMOJ Educational DP Contest AtCoder A - Frog 1
17274	DMOJ Counting Subsequences
17273	DMOJ Longest Increasing Subsequence
17272	DMOJ A Game
17271	DMOJ Maximum Sum
17270	DMOJ Dominoes
17269	DMOJ DMPG '19 S6 - A Strange Array
17268	DMOJ DMPG '19 S5 - Secret Sort
17267	DMOJ DMPG '19 S4 - Confusing Crossword Conundrum
17266	DMOJ DMPG '19 S3 - Chemical Counting Capers
17265	DMOJ DMPG '19 S2 - Code Cracking Crisis
17264	DMOJ DMPG '19 S1 - Candy Shop Tycoon
17263	DMOJ DMPG '19 G6 - Pairs
17262	DMOJ DMPG '19 G5 - Hunting the White Whale
17261	DMOJ DMPG '19 G4 - Carpet Cleaning Chore
17260	DMOJ DMPG '19 G3 - A Round Problem
17259	DMOJ DMPG '19 G2 - Test Marks
17258	DMOJ DMPG '19 G1 - Camera Calibration Challenge
17257	DMOJ DMPG '19 B6 - Oddity
17256	DMOJ DMPG '19 B5 - Triangles
17255	DMOJ DMPG '19 B4 - Braille
17254	DMOJ DMPG '19 B3 - Contact
17253	DMOJ DMPG '19 B2 - Rectangular Molecules
17252	DMOJ DMPG '19 B1 - Registration

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

17301

DMOJ Educational DP Contest AtCoder Z - Frog 3

17300

DMOJ Educational DP Contest AtCoder Y - Grid 2

17299

DMOJ Educational DP Contest AtCoder X - Tower

17298

DMOJ Educational DP Contest AtCoder W - Intervals

17297

DMOJ Educational DP Contest AtCoder V - Subtree

17296