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)
9551	AtCoder ABC170: C. Forbidden List
9550	AtCoder ABC170: B. Crane and Turtle
9549	AtCoder ABC170: A. Five Variables
9548	AtCoder ABC169: F. Knapsack for All Subsets
9547	AtCoder ABC169: E. Count Median
9546	AtCoder ABC169: D. Div Game
9545	AtCoder ABC169: C. Multiplication 3
9544	AtCoder ABC169: B. Multiplication 2
9543	AtCoder ABC169: A. Multiplication 1
9542	AtCoder ABC168: F. . (Single Dot)
9541	AtCoder ABC168: E. ∙ (Bullet)
9540	AtCoder ABC168: D. .. (Double Dots)
9539	AtCoder ABC168: C. : (Colon)
9538	AtCoder ABC168: B. ... (Triple Dots)
9537	AtCoder ABC168: A. ∴ (Therefore)
9536	AtCoder ABC167: F. Bracket Sequencing
9535	AtCoder ABC167: E. Colorful Blocks
9534	AtCoder ABC167: D. Teleporter
9533	AtCoder ABC167: C. Skill Up
9532	AtCoder ABC167: B. Easy Linear Programming
9531	AtCoder ABC167: A. Registration
9530	AtCoder ABC166: F. Three Variables Game
9529	AtCoder ABC166: E. This Message Will Self-Destruct in 5s
9528	AtCoder ABC166: D. I hate Factorization
9527	AtCoder ABC166: C. Peaks
9526	AtCoder ABC166: B. Trick or Treat
9525	AtCoder ABC166: A. A?C
9524	AtCoder ABC165: F. LIS on Tree
9523	AtCoder ABC165: E. Rotation Matching
9522	AtCoder ABC165: D. Floor Function
9521	AtCoder ABC165: C. Many Requirements
9520	AtCoder ABC165: B. 1%
9519	AtCoder ABC165: A. We Love Golf
9518	AtCoder ABC164: F. I hate Matrix Construction
9517	AtCoder ABC164: E. Two Currencies
9516	AtCoder ABC164: D. Multiple of 2019
9515	AtCoder ABC164: C. gacha
9514	AtCoder ABC164: B. Battle
9513	AtCoder ABC164: A. Sheep and Wolves
9512	AtCoder ABC163: F. path pass i
9511	AtCoder ABC163: E. Active Infants
9510	AtCoder ABC163: D. Sum of Large Numbers
9509	AtCoder ABC163: C. management
9508	AtCoder ABC163: B. Homework
9507	AtCoder ABC163: A. Circle Pond
9506	AtCoder ABC162: F. Select Half
9505	AtCoder ABC162: E. Sum of gcd of Tuples (Hard)
9504	AtCoder ABC162: D. RGB Triplets
9503	AtCoder ABC162: C. Sum of gcd of Tuples (Easy)
9502	AtCoder ABC162: B. FizzBuzz Sum

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

9551

AtCoder ABC170: C. Forbidden List

9550

AtCoder ABC170: B. Crane and Turtle

9549

AtCoder ABC170: A. Five Variables

9548

AtCoder ABC169: F. Knapsack for All Subsets

9547

AtCoder ABC169: E. Count Median

9546