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)
11351	AtCoder ARC073: F. Many Moves
11350	AtCoder ARC073: E. Ball Coloring
11349	AtCoder ABC060: D. Simple Knapsack
11348	AtCoder ABC060: C. Sentou
11347	AtCoder ARC072: F. Dam
11346	AtCoder ARC072: E. Alice in linear land
11345	AtCoder ABC059: D. Alice&Brown
11344	AtCoder ABC059: C. Sequence
11343	AtCoder ARC071: F. Infinite Sequence
11342	AtCoder ARC071: E. TrBBnsformBBtion
11341	AtCoder ABC058: D. ###
11340	AtCoder ABC058: C. Dubious Document
11339	AtCoder ARC070: F. HonestOrUnkind
11338	AtCoder ARC070: E. NarrowRectangles
11337	AtCoder ABC056: D. No Need
11336	AtCoder ABC056: C. Go Home
11335	AtCoder ARC069: F. Flags
11334	AtCoder ARC069: E. Frequency
11333	AtCoder ABC055: D. Menagerie
11332	AtCoder ABC055: C. Scc Puzzle
11331	AtCoder ARC068: F. Solitaire
11330	AtCoder ARC068: E. Snuke Line
11329	AtCoder ABC053: D. Card Eater
11328	AtCoder ABC053: C. X: Yet Another Die Game
11327	AtCoder ARC067: F. Yakiniku Restaurants
11326	AtCoder ARC067: E. Grouping
11325	AtCoder ABC052: D. Walk and Teleport
11324	AtCoder ABC052: C. Factors of Factorial
11323	AtCoder ARC066: F. Contest with Drinks Hard
11322	AtCoder ARC066: E. Addition and Subtraction Hard
11321	AtCoder ABC050: D. Xor Sum
11320	AtCoder ABC050: C. Lining Up
11319	AtCoder ARC065: F. Shuffling
11318	AtCoder ARC065: E. Manhattan Compass
11317	AtCoder ABC049: D. Connectivity
11316	AtCoder ABC049: C. Daydream
11315	AtCoder ARC064: F. Rotated Palindromes
11314	AtCoder ARC064: E. Cosmic Rays
11313	AtCoder ABC048: D. An Ordinary Game
11312	AtCoder ABC048: C. Boxes and Candies
11311	AtCoder ARC063: F. Snuke's Coloring 2
11310	AtCoder ARC063: E. Integers on a Tree
11309	AtCoder ABC047: D. An Invisible Hand
11308	AtCoder ABC047: C. 1D Reversi
11307	AtCoder ARC062: F. Painting Graphs with AtCoDeer
11306	AtCoder ARC062: E. Building Cubes with AtCoDeer
11305	AtCoder ABC046: D. AtCoDeer and Rock-Paper
11304	AtCoder ABC046: C. AtCoDeer and Election Report
11303	AtCoder ARC061: F. Card Game for Three
11302	AtCoder ARC061: E. Snuke's Subway Trip

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

11351

AtCoder ARC073: F. Many Moves

11350

AtCoder ARC073: E. Ball Coloring

11349

AtCoder ABC060: D. Simple Knapsack

11348

AtCoder ABC060: C. Sentou

11347

AtCoder ARC072: F. Dam

11346