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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)
16755 DMOJ CTSC '15 P5 - Calendar Management
16754 DMOJ Brandon's Cryptographically Secure Pseudorandom Number Generator
16753 DMOJ CSPC '15 #6 - Attendance
16752 DMOJ CSPC '15 #5 - Averages
16751 DMOJ CSPC '15 #4 - Reading Logs
16750 DMOJ CSPC '15 #3 - Spell Check
16749 DMOJ CSPC '15 #2 - Build Season
16748 DMOJ CSPC '15 #1 - The Card Game
16747 DMOJ COCI '08 Regional #6 Cvjetici
16746 DMOJ COCI '08 Regional #5 Reljef
16745 DMOJ COCI '08 Regional #4 Tablica
16744 DMOJ COCI '08 Regional #3 Cijevi
16743 DMOJ COCI '08 Regional #2 Majstor
16742 DMOJ COCI '08 Regional #1 Nop
16741 DMOJ COCI '07 Regional #4 Jednakost
16740 DMOJ COCI '07 Regional #3 Kuhar
16739 DMOJ COCI '07 Regional #2 Nikola
16738 DMOJ COCI '07 Regional #1 Platforme
16737 DMOJ COCI '06 Regional #4 Circle
16736 DMOJ COCI '06 Regional #3 Firefly
16735 DMOJ COCI '06 Regional #2 Tetris
16734 DMOJ COCI '06 Regional #1 Bard
16733 DMOJ CPC '21 Contest 1 P7 - AQT and Quarantine
16732 DMOJ CPC '21 Contest 1 P6 - AQT's Break Time is Over
16731 DMOJ CPC '21 Contest 1 P5 - AQT and Modern Art
16730 DMOJ CPC '21 Contest 1 P4 - AQT and Directed Graph
16729 DMOJ CPC '21 Contest 1 P3 - AQT and Circles
16728 DMOJ CPC '21 Contest 1 P2 - AQT and Multiset
16727 DMOJ CPC '21 Contest 1 P1 - AQT and Fractions
16726 DMOJ CPC '21 Contest 1 P0 - AQT and Alphabet
16725 DMOJ CPC '19 Contest 1 P6 - Maintaining Some Coins
16724 DMOJ CPC '19 Contest 1 P5 - A Puzzlingly Puzzling Puzzle Problem 😎
16723 DMOJ CPC '19 Contest 1 P4 - Sorting Practice
16722 DMOJ CPC '19 Contest 1 P3 - Admiral Kuznetsov
16721 DMOJ CPC '19 Contest 1 P2 - Luggage
16720 DMOJ CPC '19 Contest 1 P1 - Distance
16719 DMOJ CPC '19 Contest 1 P0 - Shoes
16718 DMOJ Non-constructive Constant Time Algorithm
16717 DMOJ Ray's Tricky Connectivity
16716 DMOJ Data Compression
16715 DMOJ Comparing Arrays
16714 DMOJ 3n+1
16713 DMOJ COI '20 #4 MalnaRISC
16712 DMOJ COI '20 #3 Izvanzemaljci
16711 DMOJ COI '20 #2 Cigle
16710 DMOJ COI '20 #1 Autobahn
16709 DMOJ COI '19 #4 Zagrade
16708 DMOJ COI '19 #3 Semafor
16707 DMOJ COI '19 #2 Pastiri
16706 DMOJ COI '19 #1 Paint
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