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)
6501	Codeforces 1438E: Yurii Can Do Everything
6500	Codeforces 1438D: Powerful Ksenia
6499	Codeforces 1438C: Engineer Artem
6498	Codeforces 1438B: Valerii Against Everyone
6497	Codeforces 1438A: Specific Tastes of Andre
6496	Codeforces 1437G: Death DBMS
6495	Codeforces 1437F: Emotional Fishermen
6494	Codeforces 1437E: Make It Increasing
6493	Codeforces 1437D: Minimal Height Tree
6492	Codeforces 1437C: Chef Monocarp
6491	Codeforces 1437B: Reverse Binary Strings
6490	Codeforces 1437A: Marketing Scheme
6489	Codeforces 1436F: Sum Over Subsets
6488	Codeforces 1436E: Complicated Computations
6487	Codeforces 1436D: Bandit in a City
6486	Codeforces 1436C: Binary Search
6485	Codeforces 1436B: Prime Square
6484	Codeforces 1436A: Reorder
6483	Codeforces 1434E: A Convex Game
6482	Codeforces 1433G: Reducing Delivery Cost
6481	Codeforces 1433F: Zero Remainder Sum
6480	Codeforces 1433E: Two Round Dances
6479	Codeforces 1433D: Districts Connection
6478	Codeforces 1433C: Dominant Piranha
6477	Codeforces 1433B: Yet Another Bookshelf
6476	Codeforces 1433A: Boring Apartments
6475	Codeforces 1431J: Zero-XOR Array
6474	Codeforces 1431I: Cyclic Shifts
6473	Codeforces 1431H: Rogue-like Game
6472	Codeforces 1431G: Number Deletion Game
6471	Codeforces 1431F: Neural Network Problem
6470	Codeforces 1431E: Chess Match
6469	Codeforces 1431D: Used Markers
6468	Codeforces 1431C: Black Friday
6467	Codeforces 1431B: Polycarp and the Language of Gods
6466	Codeforces 1431A: Selling Hamburgers
6465	Codeforces 1430G: Yet Another DAG Problem
6464	Codeforces 1430F: Realistic Gameplay
6463	Codeforces 1430E: String Reversal
6462	Codeforces 1430D: String Deletion
6461	Codeforces 1430C: Numbers on Whiteboard
6460	Codeforces 1430B: Barrels
6459	Codeforces 1430A: Number of Apartments
6458	Codeforces 1428H: Rotary Laser Lock
6457	Codeforces 1428G2: Lucky Numbers (Hard Version)
6456	Codeforces 1428G1: Lucky Numbers (Easy Version)
6455	Codeforces 1428F: Fruit Sequences
6454	Codeforces 1428E: Carrots for Rabbits
6453	Codeforces 1428D: Bouncing Boomerangs
6452	Codeforces 1428C: ABBB

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

6501

Codeforces 1438E: Yurii Can Do Everything

6500

Codeforces 1438D: Powerful Ksenia

6499

Codeforces 1438C: Engineer Artem

6498

Codeforces 1438B: Valerii Against Everyone

6497

Codeforces 1438A: Specific Tastes of Andre

6496