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)
17601	DMOJ ECOO '19 R3 P4 - Network
17600	DMOJ ECOO '19 R3 P3 - Wall
17599	DMOJ ECOO '19 R3 P2 - Array Game
17598	DMOJ ECOO '19 R3 P1 - Chords
17597	DMOJ ECOO '19 R2 P4 - Tunnels
17596	DMOJ ECOO '19 R2 P3 - Ribbon
17595	DMOJ ECOO '19 R2 P2 - Pizza
17594	DMOJ ECOO '19 R2 P1 - Email
17593	DMOJ ECOO '19 R1 P4 - Bus Route
17592	DMOJ ECOO '19 R1 P3 - Side Scrolling Simulator
17591	DMOJ ECOO '19 R1 P2 - L-Systems Go
17590	DMOJ ECOO '19 R1 P1 - Free Shirts
17589	DMOJ ECOO '18 R3 P4 - Circular Cities
17588	DMOJ ECOO '18 R3 P3 - Currency Exchange
17587	DMOJ ECOO '18 R3 P2 - Vegenère
17586	DMOJ ECOO '18 R3 P1 - Balanced
17585	DMOJ ECOO '18 R2 P4 - Three Squares
17584	DMOJ ECOO '18 R2 P3 - Factorial
17583	DMOJ ECOO '18 R2 P2 - Homework
17582	DMOJ ECOO '18 R2 P1 - Artificial Photosynthesystem
17581	DMOJ ECOO '18 R1 P4 - Fibonacci Spiral
17580	DMOJ ECOO '18 R1 P3 - Missing Art
17579	DMOJ ECOO '18 R1 P2 - Rue's Rings
17578	DMOJ ECOO '18 R1 P1 - Willow's Wild Ride
17577	DMOJ ECOO '17 R3 P4 - Ice Cream Beach
17576	DMOJ ECOO '17 R3 P3 - Region Selection
17575	DMOJ ECOO '17 R3 P2 - Family Trees
17574	DMOJ ECOO '17 R3 P1 - Baker Brie
17573	DMOJ ECOO '17 R2 P4 - Zig Zag
17572	DMOJ ECOO '17 R2 P3 - Lunch Time
17571	DMOJ ECOO '17 R2 P2 - Treasure Hunt
17570	DMOJ ECOO '17 R2 P1 - Wizard's Windows
17569	DMOJ ECOO '17 R1 P4 - Almost Sorted
17568	DMOJ ECOO '17 R1 P3 - Mountain View
17567	DMOJ ECOO '17 R1 P2 - Chocolate Chewsday
17566	DMOJ ECOO '17 R1 P1 - Munch 'n' Brunch
17565	DMOJ ECOO '16 R3 P4 - Cuthbert's Calculator
17564	DMOJ ECOO '16 R3 P3 - CamelCase
17563	DMOJ ECOO '16 R3 P2 - Target Practice
17562	DMOJ ECOO '16 R3 P1 - Nerd Poker
17561	DMOJ ECOO '16 R2 P4 - Hop, Skip and Jump
17560	DMOJ ECOO '16 R2 P3 - BattleShip
17559	DMOJ ECOO '16 R2 P2 - CC+
17558	DMOJ ECOO '16 R2 P1 - Palindrome Panic
17557	DMOJ ECOO '16 R1 P4 - Kayenne
17556	DMOJ ECOO '16 R1 P3 - Railway Sort
17555	DMOJ ECOO '16 R1 P2 - Spindie
17554	DMOJ ECOO '16 R1 P1 - Pass or Fail
17553	DMOJ ECOO '15 R3 P4 - Under the Rug
17552	DMOJ ECOO '15 R3 P3 - Roadie Cross

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

17601

DMOJ ECOO '19 R3 P4 - Network

17600

DMOJ ECOO '19 R3 P3 - Wall

17599

DMOJ ECOO '19 R3 P2 - Array Game

17598

DMOJ ECOO '19 R3 P1 - Chords

17597

DMOJ ECOO '19 R2 P4 - Tunnels

17596