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Over 20,000 problems available: AMC 8/10/12 and AIME problems from 2010-2024; USAJMO/USAMO problems from 2002-2024; USACO problems from 2014 to 2024 (all divisions); all Codeforces, AtCoder and DMOJ problems. If you leave the search field blank, it returns all problems with the specified type.

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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)
2500 Codeforces 590E: Birthday
2499 Codeforces 590D: Top Secret Task
2498 Codeforces 590C: Three States
2497 Codeforces 590B: Chip 'n Dale Rescue Rangers
2496 Codeforces 590A: Median Smoothing
2495 Codeforces 588B: Duff in Love
2494 Codeforces 588A: Duff and Meat
2493 Codeforces 587F: Duff is Mad
2492 Codeforces 587E: Duff as a Queen
2491 Codeforces 587D: Duff in Mafia
2490 Codeforces 587C: Duff in the Army
2489 Codeforces 587B: Duff in Beach
2488 Codeforces 587A: Duff and Weight Lifting
2487 Codeforces 586B: Laurenty and Shop
2486 Codeforces 586A: Alena's Schedule
2485 Codeforces 585F: Digits of Number Pi
2484 Codeforces 585E: Present for Vitalik the Philatelist
2483 Codeforces 585D: Lizard Era: Beginning
2482 Codeforces 585C: Alice, Bob, Oranges and Apples
2481 Codeforces 585B: Phillip and Trains
2480 Codeforces 585A: Gennady the Dentist
2479 Codeforces 584E: Anton and Ira
2478 Codeforces 584D: Dima and Lisa
2477 Codeforces 584C: Marina and Vasya
2476 Codeforces 584B: Kolya and Tanya
2475 Codeforces 584A: Olesya and Rodion
2474 Codeforces 583B: Robot's Task
2473 Codeforces 583A: Asphalting Roads
2472 Codeforces 582E: Boolean Function
2471 Codeforces 582D: Number of Binominal Coefficients
2470 Codeforces 582C: Superior Periodic Subarrays
2469 Codeforces 582B: Once Again...
2468 Codeforces 582A: GCD Table
2467 Codeforces 581F: Zublicanes and Mumocrates
2466 Codeforces 581E: Kojiro and Furrari
2465 Codeforces 581D: Three Logos
2464 Codeforces 581C: Developing Skills
2463 Codeforces 581B: Luxurious Houses
2462 Codeforces 581A: Vasya the Hipster
2461 Codeforces 580E: Kefa and Watch
2460 Codeforces 580D: Kefa and Dishes
2459 Codeforces 580C: Kefa and Park
2458 Codeforces 580B: Kefa and Company
2457 Codeforces 580A: Kefa and First Steps
2456 Codeforces 579B: Finding Team Member
2455 Codeforces 579A: Raising Bacteria
2454 Codeforces 578F: Mirror Box
2453 Codeforces 578E: Walking!
2452 Codeforces 578D: LCS Again
2451 Codeforces 578C: Weakness and Poorness
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