Starlight: List of Problems

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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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ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
6421 Codeforces 1423J: Bubble Cup hypothesis
6420 Codeforces 1423I: Lookup Tables
6419 Codeforces 1423H: Virus
6418 Codeforces 1423G: Growing flowers
6417 Codeforces 1423F: Coins
6416 Codeforces 1423E: 5G Antenna Towers
6415 Codeforces 1423D: Does anyone else hate the wind?
6414 Codeforces 1423C: Dušan's Railway
6413 Codeforces 1423B: Valuable Paper
6412 Codeforces 1423A: Wakanda Forever
6411 Codeforces 1422F: Boring Queries
6410 Codeforces 1422E: Minlexes
6409 Codeforces 1422D: Returning Home
6408 Codeforces 1422C: Bargain
6407 Codeforces 1422B: Nice Matrix
6406 Codeforces 1422A: Fence
6405 Codeforces 1421E: Swedish Heroes
6404 Codeforces 1421D: Hexagons
6403 Codeforces 1421C: Palindromifier
6402 Codeforces 1421B: Putting Bricks in the Wall
6401 Codeforces 1421A: XORwice
6400 Codeforces 1420E: Battle Lemmings
6399 Codeforces 1420D: Rescue Nibel!
6398 Codeforces 1420C2: Pokémon Army (hard version)
6397 Codeforces 1420C1: Pokémon Army (easy version)
6396 Codeforces 1420B: Rock and Lever
6395 Codeforces 1420A: Cubes Sorting
6394 Codeforces 1419F: Rain of Fire
6393 Codeforces 1419E: Decryption
6392 Codeforces 1419D2: Sage's Birthday (hard version)
6391 Codeforces 1419D1: Sage's Birthday (easy version)
6390 Codeforces 1419C: Killjoy
6389 Codeforces 1419B: Stairs
6388 Codeforces 1419A: Digit Game
6387 Codeforces 1418G: Three Occurrences
6386 Codeforces 1418F: Equal Product
6385 Codeforces 1418E: Expected Damage
6384 Codeforces 1418D: Trash Problem
6383 Codeforces 1418C: Mortal Kombat Tower
6382 Codeforces 1418B: Negative Prefixes
6381 Codeforces 1418A: Buying Torches
6380 Codeforces 1417B: Two Arrays
6379 Codeforces 1417A: Copy-paste
6378 Codeforces 1416F: Showing Off
6377 Codeforces 1416E: Split
6376 Codeforces 1416D: Graph and Queries
6375 Codeforces 1416C: XOR Inverse
6374 Codeforces 1416B: Make Them Equal
6373 Codeforces 1416A: k-Amazing Numbers
6372 Codeforces 1415F: Cakes for Clones
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