Starlight: List of Problems

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Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

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ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
11671 AtCoder ARC137: A. Coprime Pair
11670 AtCoder ARC136: F. Flip Cells
11669 AtCoder ARC136: E. Non-coprime DAG
11668 AtCoder ARC136: D. Without Carry
11667 AtCoder ARC136: C. Circular Addition
11666 AtCoder ARC136: B. Triple Shift
11665 AtCoder ARC136: A. A ↔ BB
11664 AtCoder ARC135: F. Delete 1, 4, 7, ...
11663 AtCoder ARC135: E. Sequence of Multiples
11662 AtCoder ARC135: D. Add to Square
11661 AtCoder ARC135: C. XOR to All
11660 AtCoder ARC135: B. Sum of Three Terms
11659 AtCoder ARC135: A. Floor, Ceil - Decomposition
11658 AtCoder ARC134: F. Flipping Coins
11657 AtCoder ARC134: E. Modulo Nim
11656 AtCoder ARC134: D. Concatenate Subsequences
11655 AtCoder ARC134: C. The Majority
11654 AtCoder ARC134: B. Reserve or Reverse
11653 AtCoder ARC134: A. Bridge and Sheets
11652 AtCoder ARC133: F. Random Transition
11651 AtCoder ARC133: E. Cyclic Medians
11650 AtCoder ARC133: D. Range XOR
11649 AtCoder ARC133: C. Row Column Sums
11648 AtCoder ARC133: B. Dividing Subsequence
11647 AtCoder ARC133: A. Erase by Value
11646 AtCoder ARC132: F. Takahashi The Strongest
11645 AtCoder ARC132: E. Paw
11644 AtCoder ARC132: D. Between Two Binary Strings
11643 AtCoder ARC132: C. Almost Sorted
11642 AtCoder ARC132: B. Shift and Reverse
11641 AtCoder ARC132: A. Permutation Grid
11640 AtCoder ARC131: F. ARC Stamp
11639 AtCoder ARC131: E. Christmas Wreath
11638 AtCoder ARC131: D. AtArcher
11637 AtCoder ARC131: C. Zero XOR
11636 AtCoder ARC131: B. Grid Repainting 4
11635 AtCoder ARC131: A. Two Lucky Numbers
11634 AtCoder ARC130: F. Replace by Average
11633 AtCoder ARC130: E. Increasing Minimum
11632 AtCoder ARC130: D. Zigzag Tree
11631 AtCoder ARC130: C. Digit Sum Minimization
11630 AtCoder ARC130: B. Colorful Lines
11629 AtCoder ARC130: A. Remove One Character
11628 AtCoder ARC129: F. Let's Play Tag
11627 AtCoder ARC129: E. Yet Another Minimization
11626 AtCoder ARC129: D. -1+2-1
11625 AtCoder ARC129: C. Multiple of 7
11624 AtCoder ARC129: B. Range Point Distance
11623 AtCoder ARC129: A. Smaller XOR
11622 AtCoder ARC128: F. Game against Robot
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