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)
17901	DMOJ Good Debugging
17900	DMOJ Good Code
17899	DMOJ Good Strategy
17898	DMOJ Good Predictions
17897	DMOJ Good Travels
17896	DMOJ Greater New York Regional 2012 - Mystery
17895	DMOJ GlobeX Cup '19 S5 - Alien Navigation
17894	DMOJ GlobeX Cup '19 S4 - Ninjaclasher's Wrath 2
17893	DMOJ GlobeX Cup '19 S3 - Ninjaclasher's Wrath
17892	DMOJ GlobeX Cup '19 S2 - Predicting Collisions
17891	DMOJ GlobeX Cup '19 S1 - Planet Classification
17890	DMOJ GlobeX Cup '19 J5 - Aliens
17889	DMOJ GlobeX Cup '19 J4 - Winni's Lonely Card Game
17888	DMOJ GlobeX Cup '19 J3 - Codex
17887	DMOJ GlobeX Cup '19 J2 - Winnie Waifu Wars
17886	DMOJ GlobeX Cup '19 J1 - Chess Master Winnie
17885	DMOJ GlobeX Cup '18 S5 - Math Bash
17884	DMOJ GlobeX Cup '18 S4 - Reversed Dijkstra's
17883	DMOJ GlobeX Cup '18 S3 - Playing With Bits
17882	DMOJ GlobeX Cup '18 S2 - Test Scores
17881	DMOJ GlobeX Cup '18 S1 - Code Copiers
17880	DMOJ GlobeX Cup '18 S Sample - Chair Stacking
17879	DMOJ GlobeX Cup '18 J5 - Errands
17878	DMOJ GlobeX Cup '18 J4 - Magical Functions
17877	DMOJ GlobeX Cup '18 J3 - Good Numbers
17876	DMOJ GlobeX Cup '18 J2 - Mark Gambling
17875	DMOJ GlobeX Cup '18 J1 - Rounding Errors
17874	DMOJ GlobeX Cup '18 J Sample - Farming Simulator
17873	DMOJ Google Kickstart '17 Round F Problem A - Kicksort
17872	DMOJ Google Kickstart '17 Round C Problem C - Magical Thinking
17871	DMOJ Google Kickstart '17 Round C Problem B - X Squared
17870	DMOJ Google Kickstart '17 Round C Problem A - Ambiguous Cipher
17869	DMOJ Google Kickstart '17 Round A Problem A - Square Counting
17868	DMOJ PEG Test '14 - Gift Delivery
17867	DMOJ Guitar Hero
17866	DMOJ GFSSOC '15 Fall Practice P5 - Bruno and Pumpkins
17865	DMOJ GFSSOC '15 Fall Practice P4 - Bruno and Fibonacci
17864	DMOJ GFSSOC '15 Fall Practice P3 - Bruno and Beads
17863	DMOJ GFSSOC '15 Fall Practice P2 - Bruno and Tennis
17862	DMOJ GFSSOC '15 Fall Practice P1 - Bruno and Trig
17861	DMOJ GFSSOC '15 Winter S5 - ORBOT
17860	DMOJ GFSSOC '15 Winter S4 - Starry Nights
17859	DMOJ GFSSOC '15 Winter S3 - PalinDrone
17858	DMOJ GFSSOC '15 Winter S2 - Soko-Boop
17857	DMOJ GFSSOC '15 Winter S1 - OR-deal
17856	DMOJ GFSSOC '15 Winter J5 - Secret Santa
17855	DMOJ GFSSOC '15 Winter J4 - Christmas Music
17854	DMOJ GFSSOC '15 Winter J3 - Christmas Presents
17853	DMOJ GFSSOC '15 Winter J2 - Purchasing Presents
17852	DMOJ GFSSOC '15 Winter J1 - Festive Fardin

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

17901

DMOJ Good Debugging

17900

DMOJ Good Code

17899

DMOJ Good Strategy

17898

DMOJ Good Predictions

17897

DMOJ Good Travels

17896