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)
17401	DMOJ DWITE '09 R5 #4 - Kind of like OCR
17400	DMOJ DWITE '09 R5 #3 - Summary Diff
17399	DMOJ DWITE '09 R5 #2 - Round to Second Prime
17398	DMOJ DWITE '09 R5 #1 - ASCII bar graphs
17397	DMOJ DWITE '09 R4 #5 - Ice Maze
17396	DMOJ DWITE '09 R4 #4 - Autocomplete
17395	DMOJ DWITE '09 R4 #3 - Moving at the same time
17394	DMOJ DWITE '09 R4 #2 - Verifying Distributed Work
17393	DMOJ DWITE '09 R4 #1 - Social Media Overload
17392	DMOJ DWITE '09 R3 #5 - Up To Four Colours
17391	DMOJ DWITE '09 R3 #4 - Spiral Out
17390	DMOJ DWITE '09 R3 #3 - Binary Test Strings 2
17389	DMOJ DWITE '09 R3 #2 - Rounding to Fibonacci
17388	DMOJ DWITE '09 R3 #1 - Quiz Time
17387	DMOJ DWITE '09 R2 #5 - Portals Redux
17386	DMOJ DWITE '09 R2 #4 - Breadth First Not Quite Tree
17385	DMOJ DWITE '09 R2 #3 - Binary Test String
17384	DMOJ DWITE '09 R2 #2 - Mini DWITE
17383	DMOJ DWITE '09 R2 #1 - Angles
17382	DMOJ DWITE '09 R1 #5 - Running In Circles
17381	DMOJ DWITE '09 R1 #4 - My First True Letter
17380	DMOJ DWITE '09 R1 #3 - That Missing Number
17379	DMOJ DWITE '09 R1 #2 - Word Scrambler
17378	DMOJ DWITE '09 R1 #1 - iProfits
17377	DMOJ DWITE '08 R5 #5 - Nash in Traffic
17376	DMOJ DWITE '08 R5 #4 - Wiring the Server Room
17375	DMOJ DWITE '08 R5 #3 - Working Directory
17374	DMOJ DWITE '08 R5 #2 - Kill Dash Nine
17373	DMOJ DWITE '08 R5 #1 - Baby Diff
17372	DMOJ DWITE '08 R4 #5 - Blow your mind with 4th D
17371	DMOJ DWITE '08 R4 #4 - Shortest path around v2
17370	DMOJ DWITE '08 R4 #3 - Secret party
17369	DMOJ DWITE '08 R4 #2 - Tic Tac Win
17368	DMOJ DWITE '08 R4 #1 - Four player Pong with no players
17367	DMOJ DWITE '08 R3 #5 - Now in 3D
17366	DMOJ DWITE '08 R3 #4 - Time for change
17365	DMOJ DWITE '08 R3 #3 - Unicorns and Teaspoons
17364	DMOJ DWITE '08 R3 #2 - Wordcount++
17363	DMOJ DWITE '08 R3 #1 - ASCII Rhombus
17362	DMOJ DWITE '08 R2 #5 - Water damage
17361	DMOJ DWITE '08 R2 #4 - Big shiny tunes
17360	DMOJ DWITE '08 R2 #3 - My drink is made of cubes
17359	DMOJ DWITE '08 R2 #2 - My favourite digit
17358	DMOJ DWITE '08 R2 #1 - My shiny digital key
17357	DMOJ DWITE '08 R1 #5 - Moving Stuff in Boxes
17356	DMOJ DWITE '08 R1 #4 - What is this Roman Numeral
17355	DMOJ DWITE '08 R1 #3 - School's a maze
17354	DMOJ DWITE '08 R1 #2 - Simple Checksum
17353	DMOJ DWITE '08 R1 #1 - LaNDscAPE ii
17352	DMOJ DWITE '07 R5 #5 - Tetris!

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

17401

DMOJ DWITE '09 R5 #4 - Kind of like OCR

17400

DMOJ DWITE '09 R5 #3 - Summary Diff

17399

DMOJ DWITE '09 R5 #2 - Round to Second Prime

17398

DMOJ DWITE '09 R5 #1 - ASCII bar graphs

17397

DMOJ DWITE '09 R4 #5 - Ice Maze

17396