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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)
11855 AtCoder ATC002: C. 最適二分探索木
11854 AtCoder ATC002: B. n^p mod m
11853 AtCoder ASPROCON9: A. Shift Scheduling
11852 AtCoder ASPROCON8: A. Automated Painting Line
11851 AtCoder ASPROCON7: A. Car Assembly Line
11850 AtCoder CF16-TOURNAMENT-ROUND1-OPEN: B. Problem where Commas Separate Digits
11849 AtCoder CF16-TOURNAMENT-ROUND2-OPEN: A. Takahashi is Missing!
11848 AtCoder CF16-TOURNAMENT-ROUND3-OPEN: A. Struck Out
11847 AtCoder CF16-TOURNAMENT-ROUND1-OPEN: A. Graph
11846 AtCoder CF16-TOURNAMENT-ROUND3-OPEN: B. Compression
11845 AtCoder CF16-TOURNAMENT-ROUND2-OPEN: B. Takahashi the Magician
11844 AtCoder CF17-TOURNAMENT-ROUND3-OPEN: F. Unicyclic Graph Counting
11843 AtCoder CF17-TOURNAMENT-ROUND3-OPEN: E. Black Cats Deployment
11842 AtCoder CF17-TOURNAMENT-ROUND1-OPEN: D. Ancient Tree Record
11841 AtCoder CF17-TOURNAMENT-ROUND1-OPEN: C. Paired Parentheses
11840 AtCoder CF17-TOURNAMENT-ROUND2-OPEN: B. Many Swaps Sorting
11839 AtCoder CF17-TOURNAMENT-ROUND2-OPEN: A. Colorful MST
11838 AtCoder ARC164: F. Subtree Reversi
11837 AtCoder ARC164: E. Segment-Tree Optimization
11836 AtCoder ARC164: D. 1D Coulomb
11835 AtCoder ARC164: C. Reversible Card Game
11834 AtCoder ARC164: B. Switching Travel
11833 AtCoder ARC164: A. Ternary Decomposition
11832 AtCoder ARC163: F. Many Increasing Problems
11831 AtCoder ARC163: E. Chmin XOR Game
11830 AtCoder ARC163: D. Sum of SCC
11829 AtCoder ARC163: C. Harmonic Mean
11828 AtCoder ARC163: B. Favorite Game
11827 AtCoder ARC163: A. Divide String
11826 AtCoder ARC162: F. Montage
11825 AtCoder ARC162: E. Strange Constraints
11824 AtCoder ARC162: D. Smallest Vertices
11823 AtCoder ARC162: C. Mex Game on Tree
11822 AtCoder ARC162: B. Insertion Sort 2
11821 AtCoder ARC162: A. Ekiden Race
11820 AtCoder ARC161: F. Everywhere is Sparser than Whole (Judge)
11819 AtCoder ARC161: E. Not Dyed by Majority (Cubic Graph)
11818 AtCoder ARC161: D. Everywhere is Sparser than Whole (Construction)
11817 AtCoder ARC161: C. Dyed by Majority (Odd Tree)
11816 AtCoder ARC161: B. Exactly Three Bits
11815 AtCoder ARC161: A. Make M
11814 AtCoder ARC160: F. Count Sorted Arrays
11813 AtCoder ARC160: E. Make Biconnected
11812 AtCoder ARC160: D. Mahjong
11811 AtCoder ARC160: C. Power Up
11810 AtCoder ARC160: B. Triple Pair
11809 AtCoder ARC160: A. Reverse and Count
11808 AtCoder ARC159: F. Good Division
11807 AtCoder ARC159: E. Difference Sum Query
11806 AtCoder ARC159: D. LIS 2
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