题目来源
- A:
京都大学プログラミングコンテスト 2020 (Petrozavodsk Summer 2021 Day 1: Kyoto U Contest)- 京都大学プログラミングコンテスト 是由京都大学的学生自愿组织的程序设计竞赛。
- Twitter: @kupc_official
- B: Petrozavodsk Winter 2022 Day 6: ICPC Camp Day 1, PKU Contest, Problem E
- 原题有追加制约 $\mathbf{1 } \leq x \leq 10^{18}$
- C: Petrozavodsk Winter 2022 Day 6: ICPC Camp Day 1, PKU Contest, Problem B
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