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)
6901	Codeforces 1517D: Explorer Space
6900	Codeforces 1517C: Fillomino 2
6899	Codeforces 1517B: Morning Jogging
6898	Codeforces 1517A: Sum of 2050
6897	Codeforces 1516E: Baby Ehab Plays with Permutations
6896	Codeforces 1516D: Cut
6895	Codeforces 1516C: Baby Ehab Partitions Again
6894	Codeforces 1516B: AGAGA XOOORRR
6893	Codeforces 1516A: Tit for Tat
6892	Codeforces 1515I: Phoenix and Diamonds
6891	Codeforces 1515H: Phoenix and Bits
6890	Codeforces 1515G: Phoenix and Odometers
6889	Codeforces 1515F: Phoenix and Earthquake
6888	Codeforces 1515E: Phoenix and Computers
6887	Codeforces 1515D: Phoenix and Socks
6886	Codeforces 1515C: Phoenix and Towers
6885	Codeforces 1515B: Phoenix and Puzzle
6884	Codeforces 1515A: Phoenix and Gold
6883	Codeforces 1514E: Baby Ehab's Hyper Apartment
6882	Codeforces 1514D: Cut and Stick
6881	Codeforces 1514C: Product 1 Modulo N
6880	Codeforces 1514B: AND 0, Sum Big
6879	Codeforces 1514A: Perfectly Imperfect Array
6878	Codeforces 1513F: Swapping Problem
6877	Codeforces 1513E: Cost Equilibrium
6876	Codeforces 1513D: GCD and MST
6875	Codeforces 1513C: Add One
6874	Codeforces 1513B: AND Sequences
6873	Codeforces 1513A: Array and Peaks
6872	Codeforces 1512G: Short Task
6871	Codeforces 1512F: Education
6870	Codeforces 1512E: Permutation by Sum
6869	Codeforces 1512D: Corrupted Array
6868	Codeforces 1512C: A-B Palindrome
6867	Codeforces 1512B: Almost Rectangle
6866	Codeforces 1512A: Spy Detected!
6865	Codeforces 1511G: Chips on a Board
6864	Codeforces 1511F: Chainword
6863	Codeforces 1511E: Colorings and Dominoes
6862	Codeforces 1511D: Min Cost String
6861	Codeforces 1511C: Yet Another Card Deck
6860	Codeforces 1511B: GCD Length
6859	Codeforces 1511A: Review Site
6858	Codeforces 1510K: King's Task
6857	Codeforces 1510J: Japanese Game
6856	Codeforces 1510I: Is It Rated?
6855	Codeforces 1510H: Hard Optimization
6854	Codeforces 1510G: Guide
6853	Codeforces 1510F: Fiber Shape
6852	Codeforces 1510E: Equilibrium Point /\textbackslash/\textbackslash

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

6901

Codeforces 1517D: Explorer Space

6900

Codeforces 1517C: Fillomino 2

6899

Codeforces 1517B: Morning Jogging

6898

Codeforces 1517A: Sum of 2050

6897

Codeforces 1516E: Baby Ehab Plays with Permutations

6896