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)
7151	Codeforces 1560F2: Nearest Beautiful Number (hard version)
7150	Codeforces 1560F1: Nearest Beautiful Number (easy version)
7149	Codeforces 1560E: Polycarp and String Transformation
7148	Codeforces 1560D: Make a Power of Two
7147	Codeforces 1560C: Infinity Table
7146	Codeforces 1560B: Who's Opposite?
7145	Codeforces 1560A: Dislike of Threes
7144	Codeforces 1559E: Mocha and Stars
7143	Codeforces 1559D2: Mocha and Diana (Hard Version)
7142	Codeforces 1559D1: Mocha and Diana (Easy Version)
7141	Codeforces 1559C: Mocha and Hiking
7140	Codeforces 1559B: Mocha and Red and Blue
7139	Codeforces 1559A: Mocha and Math
7138	Codeforces 1558F: Strange Sort
7137	Codeforces 1558E: Down Below
7136	Codeforces 1558D: Top-Notch Insertions
7135	Codeforces 1558C: Bottom-Tier Reversals
7134	Codeforces 1558B: Up the Strip
7133	Codeforces 1558A: Charmed by the Game
7132	Codeforces 1557E: Assiut Chess
7131	Codeforces 1557D: Ezzat and Grid
7130	Codeforces 1557C: Moamen and XOR
7129	Codeforces 1557B: Moamen and k-subarrays
7128	Codeforces 1557A: Ezzat and Two Subsequences
7127	Codeforces 1556H: DIY Tree
7126	Codeforces 1556G: Gates to Another World
7125	Codeforces 1556F: Sports Betting
7124	Codeforces 1556E: Equilibrium
7123	Codeforces 1556D: Take a Guess
7122	Codeforces 1556C: Compressed Bracket Sequence
7121	Codeforces 1556B: Take Your Places!
7120	Codeforces 1556A: A Variety of Operations
7119	Codeforces 1555F: Good Graph
7118	Codeforces 1555E: Boring Segments
7117	Codeforces 1555D: Say No to Palindromes
7116	Codeforces 1555C: Coin Rows
7115	Codeforces 1555B: Two Tables
7114	Codeforces 1555A: PizzaForces
7113	Codeforces 1554E: You
7112	Codeforces 1554D: Diane
7111	Codeforces 1554C: Mikasa
7110	Codeforces 1554B: Cobb
7109	Codeforces 1554A: Cherry
7108	Codeforces 1553I: Stairs
7107	Codeforces 1553H: XOR and Distance
7106	Codeforces 1553G: Common Divisor Graph
7105	Codeforces 1553F: Pairwise Modulo
7104	Codeforces 1553E: Permutation Shift
7103	Codeforces 1553D: Backspace
7102	Codeforces 1553C: Penalty

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

7151

Codeforces 1560F2: Nearest Beautiful Number (hard version)

7150

Codeforces 1560F1: Nearest Beautiful Number (easy version)

7149

Codeforces 1560E: Polycarp and String Transformation

7148

Codeforces 1560D: Make a Power of Two

7147

Codeforces 1560C: Infinity Table

7146