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)
15701	DMOJ CCC '17 S2 - High Tide, Low Tide
15700	DMOJ CCC '17 S1 - Sum Game
15699	DMOJ CCC '17 J4 - Favourite Times
15698	DMOJ CCC '17 J3 - Exactly Electrical
15697	DMOJ CCC '17 J2 - Shifty Sum
15696	DMOJ CCC '17 J1 - Quadrant Selection
15695	DMOJ CCC '16 S5 - Circle of Life
15694	DMOJ CCC '16 S4 - Combining Riceballs
15693	DMOJ CCC '16 S3 - Phonomenal Reviews
15692	DMOJ CCC '16 S2 - Tandem Bicycle
15691	DMOJ CCC '16 S1 - Ragaman
15690	DMOJ CCC '16 J4 - Arrival Time
15689	DMOJ CCC '16 J3 - Hidden Palindrome
15688	DMOJ CCC '16 J2 - Magic Squares
15687	DMOJ CCC '16 J1 - Tournament Selection
15686	DMOJ CCC '15 S5 - Greedy For Pies
15685	DMOJ CCC '15 S4 - Convex Hull
15684	DMOJ CCC '15 S3 - Gates
15683	DMOJ CCC '15 S2 - Jerseys
15682	DMOJ CCC '15 S1 - Zero That Out
15681	DMOJ CCC '15 J5 - π-day
15680	DMOJ CCC '15 J4 - Wait Time
15679	DMOJ CCC '15 J3 - Rövarspråket
15678	DMOJ CCC '15 J2 - Happy or Sad
15677	DMOJ CCC '15 J1 - Special Day
15676	DMOJ CCC '14 S5 - Lazy Fox
15675	DMOJ CCC '14 S4 - Tinted Glass Window
15674	DMOJ CCC '14 S3 - The Geneva Confection
15673	DMOJ CCC '14 S2 - Assigning Partners
15672	DMOJ CCC '14 S1 - Party Invitation
15671	DMOJ CCC '14 J3 - Double Dice
15670	DMOJ CCC '14 J2 - Vote Count
15669	DMOJ CCC '14 J1 - Triangle Times
15668	DMOJ CCC '13 S5 - Factor Solitaire
15667	DMOJ CCC '13 S4 - Who is Taller?
15666	DMOJ CCC '13 S3 - Chances of Winning
15665	DMOJ CCC '13 S2 - Bridge Transport
15664	DMOJ CCC '13 S1 - From 1987 to 2013
15663	DMOJ CCC '13 J4 - Time on task
15662	DMOJ CCC '13 J2 - Rotating letters
15661	DMOJ CCC '13 J1 - Next in line
15660	DMOJ CCC '12 S5 - Mouse Journey
15659	DMOJ CCC '12 S4 - A Coin Game
15658	DMOJ CCC '12 S3 - Absolutely Acidic
15657	DMOJ CCC '12 S2 - Aromatic Numbers
15656	DMOJ CCC '12 S1 - Don't pass me the ball!
15655	DMOJ CCC '12 J4 - Big Bang Secrets
15654	DMOJ CCC '12 J3 - Icon Scaling
15653	DMOJ CCC '12 J2 - Sounds fishy!
15652	DMOJ CCC '12 J1 - Speed fines are not fine!

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

15701

DMOJ CCC '17 S2 - High Tide, Low Tide

15700

DMOJ CCC '17 S1 - Sum Game

15699

DMOJ CCC '17 J4 - Favourite Times

15698

DMOJ CCC '17 J3 - Exactly Electrical

15697

DMOJ CCC '17 J2 - Shifty Sum

15696