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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)
11605 AtCoder ARC126: A. Make 10
11604 AtCoder ARC125: F. Tree Degree Subset Sum
11603 AtCoder ARC125: E. Snack
11602 AtCoder ARC125: D. Unique Subsequence
11601 AtCoder ARC125: C. LIS to Original Sequence
11600 AtCoder ARC125: B. Squares
11599 AtCoder ARC125: A. Dial Up
11598 AtCoder ARC124: F. Chance Meeting
11597 AtCoder ARC124: E. Pass to Next
11596 AtCoder ARC124: D. Yet Another Sorting Problem
11595 AtCoder ARC124: C. LCM of GCDs
11594 AtCoder ARC124: B. XOR Matching 2
11593 AtCoder ARC124: A. LR Constraints
11592 AtCoder ARC123: F. Insert Addition
11591 AtCoder ARC123: E. Training
11590 AtCoder ARC123: D. Inc, Dec - Decomposition
11589 AtCoder ARC123: C. 1, 2, 3 - Decomposition
11588 AtCoder ARC123: B. Increasing Triples
11587 AtCoder ARC123: A. Arithmetic Sequence
11586 AtCoder ARC122: F. Domination
11585 AtCoder ARC122: E. Increasing LCMs
11584 AtCoder ARC122: D. XOR Game
11583 AtCoder ARC122: C. Calculator
11582 AtCoder ARC122: B. Insurance
11581 AtCoder ARC122: A. Many Formulae
11580 AtCoder ARC121: F. Logical Operations on Tree
11579 AtCoder ARC121: E. Directed Tree
11578 AtCoder ARC121: D. 1 or 2
11577 AtCoder ARC121: C. Odd Even Sort
11576 AtCoder ARC121: B. RGB Matching
11575 AtCoder ARC121: A. 2nd Greatest Distance
11574 AtCoder ARC120: F2. Wine Thief
11573 AtCoder ARC120: F. Wine Thief
11572 AtCoder ARC120: E. 1D Party
11571 AtCoder ARC120: D. Bracket Score 2
11570 AtCoder ARC120: C. Swaps 2
11569 AtCoder ARC120: B. Uniformly Distributed
11568 AtCoder ARC120: A. Max Add
11567 AtCoder ARC119: F. AtCoder Express 3
11566 AtCoder ARC119: E. Pancakes
11565 AtCoder ARC119: D. Grid Repainting 3
11564 AtCoder ARC119: C. ARC Wrecker 2
11563 AtCoder ARC119: B. Electric Board
11562 AtCoder ARC119: A. 119 × 2^23 + 1
11561 AtCoder ARC118: F. Growth Rate
11560 AtCoder ARC118: E. Avoid Permutations
11559 AtCoder ARC118: D. Hamiltonian Cycle
11558 AtCoder ARC118: C. Coprime Set
11557 AtCoder ARC118: B. Village of M People
11556 AtCoder ARC118: A. Tax Included Price
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