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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)
1400 Codeforces 315A: Sereja and Bottles
1399 Codeforces 314E: Sereja and Squares
1398 Codeforces 314D: Sereja and Straight Lines
1397 Codeforces 314C: Sereja and Subsequences
1396 Codeforces 314B: Sereja and Periods
1395 Codeforces 314A: Sereja and Contest
1394 Codeforces 313E: Ilya and Two Numbers
1393 Codeforces 313D: Ilya and Roads
1392 Codeforces 313C: Ilya and Matrix
1391 Codeforces 313B: Ilya and Queries
1390 Codeforces 313A: Ilya and Bank Account
1389 Codeforces 312B: Archer
1388 Codeforces 312A: Whose sentence is it?
1387 Codeforces 311E: Biologist
1386 Codeforces 311D: Interval Cubing
1385 Codeforces 311C: Fetch the Treasure
1384 Codeforces 311B: Cats Transport
1383 Codeforces 311A: The Closest Pair
1382 Codeforces 309E: Sheep
1381 Codeforces 309D: Tennis Rackets
1380 Codeforces 309C: Memory for Arrays
1379 Codeforces 309B: Context Advertising
1378 Codeforces 309A: Morning run
1377 Codeforces 306D: Polygon
1376 Codeforces 306C: White, Black and White Again
1375 Codeforces 306B: Optimizer
1374 Codeforces 306A: Candies
1373 Codeforces 305E: Playing with String
1372 Codeforces 305D: Olya and Graph
1371 Codeforces 305C: Ivan and Powers of Two
1370 Codeforces 305B: Continued Fractions
1369 Codeforces 305A: Strange Addition
1368 Codeforces 304B: Calendar
1367 Codeforces 304A: Pythagorean Theorem II
1366 Codeforces 303E: Random Ranking
1365 Codeforces 303D: Rotatable Number
1364 Codeforces 303C: Minimum Modular
1363 Codeforces 303B: Rectangle Puzzle II
1362 Codeforces 303A: Lucky Permutation Triple
1361 Codeforces 302B: Eugeny and Play List
1360 Codeforces 302A: Eugeny and Array
1359 Codeforces 301E: Yaroslav and Arrangements
1358 Codeforces 301D: Yaroslav and Divisors
1357 Codeforces 301C: Yaroslav and Algorithm
1356 Codeforces 301B: Yaroslav and Time
1355 Codeforces 301A: Yaroslav and Sequence
1354 Codeforces 300E: Empire Strikes Back
1353 Codeforces 300D: Painting Square
1352 Codeforces 300C: Beautiful Numbers
1351 Codeforces 300B: Coach
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