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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)
350 Codeforces 67B: Restoration of the Permutation
349 Codeforces 67A: Partial Teacher
348 Codeforces 66E: Petya and Post
347 Codeforces 66D: Petya and His Friends
346 Codeforces 66C: Petya and File System
345 Codeforces 66B: Petya and Countryside
344 Codeforces 66A: Petya and Java
343 Codeforces 65E: Harry Potter and Moving Staircases
342 Codeforces 65D: Harry Potter and the Sorting Hat
341 Codeforces 65C: Harry Potter and the Golden Snitch
340 Codeforces 65B: Harry Potter and the History of Magic
339 Codeforces 65A: Harry Potter and Three Spells
338 Codeforces 64I: Sort the Table
337 Codeforces 64H: Table Bowling
336 Codeforces 64G: Path Canonization
335 Codeforces 64F: Domain
334 Codeforces 64E: Prime Segment
333 Codeforces 64D: Presents
332 Codeforces 64C: Table
331 Codeforces 64B: Expression
330 Codeforces 64A: Factorial
329 Codeforces 63E: Sweets Game
328 Codeforces 63D: Dividing Island
327 Codeforces 63C: Bulls and Cows
326 Codeforces 63B: Settlers' Training
325 Codeforces 63A: Sinking Ship
324 Codeforces 62E: World Evil
323 Codeforces 62D: Wormhouse
322 Codeforces 62C: Inquisition
321 Codeforces 62B: Tyndex.Brome
320 Codeforces 62A: A Student's Dream
319 Codeforces 61E: Enemy is weak
318 Codeforces 61D: Eternal Victory
317 Codeforces 61C: Capture Valerian
316 Codeforces 61B: Hard Work
315 Codeforces 61A: Ultra-Fast Mathematician
314 Codeforces 60E: Mushroom Gnomes
313 Codeforces 60D: Savior
312 Codeforces 60C: Mushroom Strife
311 Codeforces 60B: Serial Time!
310 Codeforces 60A: Where Are My Flakes?
309 Codeforces 59E: Shortest Path
308 Codeforces 59D: Team Arrangement
307 Codeforces 59C: Title
306 Codeforces 59B: Fortune Telling
305 Codeforces 59A: Word
304 Codeforces 58E: Expression
303 Codeforces 58D: Calendar
302 Codeforces 58C: Trees
301 Codeforces 58B: Coins
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