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.

Need help searching? Click for format/examples of problems

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)
16551	DMOJ COCI '19 Contest 3 #1 Preokret
16550	DMOJ COCI '19 Contest 2 #5 Zvijezda
16549	DMOJ COCI '19 Contest 2 #4 Popcount
16548	DMOJ COCI '19 Contest 2 #3 Checker
16547	DMOJ COCI '19 Contest 2 #2 Slagalica
16546	DMOJ COCI '19 Contest 2 #1 ACM
16545	DMOJ COCI '19 Contest 1 #5 Zoo
16544	DMOJ COCI '19 Contest 1 #4 Trobojnica
16543	DMOJ COCI '19 Contest 1 #3 Džumbus
16542	DMOJ COCI '19 Contest 1 #2 Lutrija
16541	DMOJ COCI '19 Contest 1 #1 Trol
16540	DMOJ COCI '18 Contest 6 #5 Mobitel
16539	DMOJ COCI '18 Contest 6 #4 Simfonija
16538	DMOJ COCI '18 Contest 6 #3 Sličice
16537	DMOJ COCI '18 Contest 6 #2 Konj
16536	DMOJ COCI '18 Contest 6 #1 Lun
16535	DMOJ COCI '18 Contest 5 #5 Transport
16534	DMOJ COCI '18 Contest 5 #4 Parametriziran
16533	DMOJ COCI '18 Contest 5 #3 Ispit
16532	DMOJ COCI '18 Contest 5 #2 Jarvis
16531	DMOJ COCI '18 Contest 5 #1 Titlovi
16530	DMOJ COCI '18 Contest 4 #5 Akvizna
16529	DMOJ COCI '18 Contest 4 #4 Slagalica
16528	DMOJ COCI '18 Contest 4 #3 Kisik
16527	DMOJ COCI '18 Contest 4 #2 Wand
16526	DMOJ COCI '18 Contest 4 #1 Elder
16525	DMOJ COCI '18 Contest 3 #5 Praktični
16524	DMOJ COCI '18 Contest 3 #4 NLO
16523	DMOJ COCI '18 Contest 3 #3 Sajam
16522	DMOJ COCI '18 Contest 3 #2 Pismo
16521	DMOJ COCI '18 Contest 3 #1 Magnus
16520	DMOJ COCI '18 Contest 2 #5 Sunčanje
16519	DMOJ COCI '18 Contest 2 #4 Maja
16518	DMOJ COCI '18 Contest 2 #3 Deblo
16517	DMOJ COCI '18 Contest 2 #2 Kocka
16516	DMOJ COCI '18 Contest 2 #1 Preokret
16515	DMOJ COCI '18 Contest 1 #5 Teoretičar
16514	DMOJ COCI '18 Contest 1 #4 Strah
16513	DMOJ COCI '18 Contest 1 #3 Cipele
16512	DMOJ COCI '18 Contest 1 #2 Zamjena
16511	DMOJ COCI '18 Contest 1 #1 Nadan
16510	DMOJ COCI '17 Contest 7 #6 Priglavci
16509	DMOJ COCI '17 Contest 7 #5 Dostavljač
16508	DMOJ COCI '17 Contest 7 #4 Clickbait
16507	DMOJ COCI '17 Contest 7 #3 Go
16506	DMOJ COCI '17 Contest 7 #2 Timovi
16505	DMOJ COCI '17 Contest 7 #1 Prosjek
16504	DMOJ COCI '17 Contest 6 #6 Vrtić
16503	DMOJ COCI '17 Contest 6 #5 Kotrljanje
16502	DMOJ COCI '17 Contest 6 #4 Cover

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

16551

DMOJ COCI '19 Contest 3 #1 Preokret

16550

DMOJ COCI '19 Contest 2 #5 Zvijezda

16549

DMOJ COCI '19 Contest 2 #4 Popcount

16548

DMOJ COCI '19 Contest 2 #3 Checker

16547

DMOJ COCI '19 Contest 2 #2 Slagalica

16546