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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)
4855 Codeforces 1116B1: Distinguish three-qubit states
4854 Codeforces 1116A2: Generate equal superposition of four basis states
4853 Codeforces 1116A1: Generate state |00⟩ + |01⟩ + |10⟩
4852 Codeforces 1115U3: Block unitary
4851 Codeforces 1115U2: Chessboard unitary
4850 Codeforces 1115U1: Anti-diagonal unitary
4849 Codeforces 1115G3: Palindrome checker oracle
4848 Codeforces 1115G2: OR oracle
4847 Codeforces 1115G1: AND oracle
4846 Codeforces 1114F: Please, another Queries on Array?
4845 Codeforces 1114E: Arithmetic Progression
4844 Codeforces 1114D: Flood Fill
4843 Codeforces 1114C: Trailing Loves (or L'oeufs?)
4842 Codeforces 1114B: Yet Another Array Partitioning Task
4841 Codeforces 1114A: Got Any Grapes?
4840 Codeforces 1113B: Sasha and Magnetic Machines
4839 Codeforces 1113A: Sasha and His Trip
4838 Codeforces 1111E: Tree
4837 Codeforces 1111D: Destroy the Colony
4836 Codeforces 1111C: Creative Snap
4835 Codeforces 1111B: Average Superhero Gang Power
4834 Codeforces 1111A: Superhero Transformation
4833 Codeforces 1110H: Modest Substrings
4832 Codeforces 1110G: Tree-Tac-Toe
4831 Codeforces 1110F: Nearest Leaf
4830 Codeforces 1110E: Magic Stones
4829 Codeforces 1110D: Jongmah
4828 Codeforces 1110C: Meaningless Operations
4827 Codeforces 1110B: Tape
4826 Codeforces 1110A: Parity
4825 Codeforces 1109F: Sasha and Algorithm of Silence's Sounds
4824 Codeforces 1109E: Sasha and a Very Easy Test
4823 Codeforces 1109D: Sasha and Interesting Fact from Graph Theory
4822 Codeforces 1109C: Sasha and a Patient Friend
4821 Codeforces 1109B: Sasha and One More Name
4820 Codeforces 1109A: Sasha and a Bit of Relax
4819 Codeforces 1108F: MST Unification
4818 Codeforces 1108E2: Array and Segments (Hard version)
4817 Codeforces 1108E1: Array and Segments (Easy version)
4816 Codeforces 1108D: Diverse Garland
4815 Codeforces 1108C: Nice Garland
4814 Codeforces 1108B: Divisors of Two Integers
4813 Codeforces 1108A: Two distinct points
4812 Codeforces 1107G: Vasya and Maximum Profit
4811 Codeforces 1107F: Vasya and Endless Credits
4810 Codeforces 1107E: Vasya and Binary String
4809 Codeforces 1107D: Compression
4808 Codeforces 1107C: Brutality
4807 Codeforces 1107B: Digital root
4806 Codeforces 1107A: Digits Sequence Dividing
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