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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)
18533 DMOJ Mock CCC '18 Contest 5 J5/S3 - Directed Graph Connectivity
18532 DMOJ Mock CCC '18 Contest 5 J4/S2 - Reverse Sort
18531 DMOJ Mock CCC '18 Contest 5 J3/S1 - Median Triples
18530 DMOJ Mock CCC '18 Contest 5 J2 - Smallest Mode
18529 DMOJ Mock CCC '18 Contest 5 J1 - Looking for the CCC
18528 DMOJ Mock CCC '18 Contest 3 S5 - A Rage Tree Problem
18527 DMOJ Mock CCC '18 Contest 3 S4 - A Graph Problem
18526 DMOJ Mock CCC '18 Contest 3 J5/S3 - A Cookie-Cutter Problem
18525 DMOJ Mock CCC '18 Contest 3 J4/S2 - A Median Problem
18524 DMOJ Mock CCC '18 Contest 3 J3/S1 - A String Problem
18523 DMOJ Mock CCC '18 Contest 3 J2 - A Palindrome Problem
18522 DMOJ Mock CCC '18 Contest 3 J1 - A Sum Problem
18521 DMOJ Mock CCC '18 Contest 2 S5 - A Link/Cut Tree Problem
18520 DMOJ Mock CCC '18 Contest 2 S4 - A Tree Problem
18519 DMOJ Mock CCC '18 Contest 2 J5/S3 - A Coloring Problem
18518 DMOJ Mock CCC '18 Contest 2 J4/S2 - A Geometry Problem
18517 DMOJ Mock CCC '18 Contest 2 J3/S1 - An Array Problem
18516 DMOJ Mock CCC '18 Contest 2 J2 - A Software Engineering Task
18515 DMOJ Mock CCC '18 Contest 2 J1 - An Arithmetic Problem
18514 DMOJ Mock CCC '18 Contest 1 S5 - A Palindrome Problem
18513 DMOJ Mock CCC '18 Contest 1 S4 - A Graph Problem
18512 DMOJ Mock CCC '18 Contest 1 J5/S3 - A Simulation Problem
18511 DMOJ Mock CCC '18 Contest 1 J4/S2 - A Square Problem
18510 DMOJ Mock CCC '18 Contest 1 J3/S1 - A Math Problem
18509 DMOJ Mock CCC '18 Contest 1 J2 - A Substring Problem
18508 DMOJ Mock CCC '18 Contest 1 J1 - A String Problem
18507 DMOJ Mock CCC '22 2 S5 - Kaguya Wants to go Window Shopping with Kei Shirogane
18506 DMOJ Mock CCC '22 2 S4 - Kaguya Wants to Build a Great Wall
18505 DMOJ Mock CCC '22 2 S3 - Kaguya Wants to Analyze the Academy Anthem
18504 DMOJ Mock CCC '22 2 S2 - Kaguya Wants to Grow the Student Council
18503 DMOJ Mock CCC '22 2 S1 - Kaguya Wants to Let Ishigami Pass
18502 DMOJ ICPC NAQ 2016 L - Unusual Darts
18501 DMOJ ICPC NAQ 2016 K - Robotopia
18500 DMOJ ICPC NAQ 2016 J - Quick Estimates
18499 DMOJ ICPC NAQ 2016 I - Primonimo
18498 DMOJ ICPC NAQ 2016 H - Nine Packs
18497 DMOJ ICPC NAQ 2016 G - Inverse Factorial
18496 DMOJ ICPC NAQ 2016 F - Free Desserts
18495 DMOJ ICPC NAQ 2016 E - Dots and Boxes
18494 DMOJ ICPC NAQ 2016 D - Brackets
18493 DMOJ ICPC NAQ 2016 C - Big Truck
18492 DMOJ ICPC NAQ 2016 B - Arcade!
18491 DMOJ ICPC NAQ 2016 A - A New Alphabet
18490 DMOJ ICPC NAQ 2015 G - Safe Passage
18489 DMOJ ICPC NAQ 2015 F - Quick Brown Fox
18488 DMOJ ICPC NAQ 2015 A - All About That Base
18487 DMOJ Mynerva
18486 DMOJ MWC '15 #8 P3: Draw Down
18485 DMOJ MWC '15 #8 P2: ASCII Art
18484 DMOJ MWC '15 #8 P1: Push-up Contest
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