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)
11921 AtCoder CF17-FINAL: C. Time Gap
11920 AtCoder CF17-FINAL: B. Palindrome-phobia
11919 AtCoder CF17-FINAL: A. AKIBA
11918 AtCoder CF17-EXHIBITION-OPEN: B. Increment and Swap
11917 AtCoder CF17-EXHIBITION-OPEN: A. Awkward
11916 AtCoder CF16-EXHIBITION-FINAL: J. 123 Pairs
11915 AtCoder CF16-EXHIBITION-FINAL: I. 90 and 270
11914 AtCoder CF16-EXHIBITION-FINAL: H. AB=C Problem
11913 AtCoder CF16-EXHIBITION-FINAL: G. FESTIVAL
11912 AtCoder CF16-EXHIBITION-FINAL: F. Intervals
11911 AtCoder CF16-EXHIBITION-FINAL: E. Water Distribution
11910 AtCoder CF16-EXHIBITION-FINAL: D. Dice Game
11909 AtCoder CF16-EXHIBITION-FINAL: C. Cheating Nim
11908 AtCoder CF16-EXHIBITION-FINAL: B. Inscribed Bicycle
11907 AtCoder CF16-EXHIBITION-FINAL: A. 1D Matching
11906 AtCoder CADDI2019: A. 球の詰め込み
11905 AtCoder CADDI2018B: B. AtCoder Alloy
11904 AtCoder CADDI2018B: A. 12/22
11903 AtCoder CADDI2018: F. Square
11902 AtCoder CADDI2018: E. Negative Doubling
11901 AtCoder CADDI2018B: D. Harlequin
11900 AtCoder CADDI2018B: C. Product and GCD
11899 AtCoder BITFLYER2018-QUAL: E. 祝日
11898 AtCoder BITFLYER2018-QUAL: D. ハンコ
11897 AtCoder BITFLYER2018-QUAL: C. 徒歩圏内
11896 AtCoder BITFLYER2018-QUAL: B. 洋菓子店
11895 AtCoder BITFLYER2018-QUAL: A. 本選参加者数
11894 AtCoder BITFLYER2018-FINAL: H. 三角形と格子点
11893 AtCoder BITFLYER2018-FINAL: G. Following Permutations
11892 AtCoder BITFLYER2018-FINAL: F. 配信パズル
11891 AtCoder BITFLYER2018-FINAL: E. 数式とクエリ
11890 AtCoder BITFLYER2018-FINAL: D. 数列 XOR
11889 AtCoder BITFLYER2018-FINAL: C. 部分文字列と括弧
11888 AtCoder BITFLYER2018-FINAL: B. 交通費
11887 AtCoder BITFLYER2018-FINAL: A. 値札
11886 AtCoder BIRTHDAY0410: X. この問題はほんとうにひどい問題であるため,できれば先に他の問題のほうをお楽しみいただければと思っておりまして,ですので他の問題を通し終えて暇になり,かつその暇を
11885 AtCoder BIRTHDAY0410: F. おいらの素数生成式
11884 AtCoder BIRTHDAY0410: E. 排他的☆論理和っ!!
11883 AtCoder BIRTHDAY0410: D. 先生と遺書
11882 AtCoder BIRTHDAY0410: C. ロ シ ア
11881 AtCoder BIRTHDAY0410: B. ライスゲーム
11880 AtCoder BIRTHDAY0410: A. A + B
11879 AtCoder BCU30: F. 数列と計算
11878 AtCoder BCU30: E. スライドパズル
11877 AtCoder BCU30: D. 数直線
11876 AtCoder BCU30: C. クロスワード
11875 AtCoder BCU30: B. 数字パズル
11874 AtCoder BCU30: A. すごろく
11873 AtCoder BCU30-2019-QUAL: A. Bullet of Flame
11872 AtCoder BCU30-2019: B. Interval Addition
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