https://codeforces.com/blog/entry/94384 重要结论: \(a+b = (a \space or\space b)+(a\space and\space b)\) 相关文章： 2021-06-03 2022-02-28 2021-07-16 2021-12-11 2021-09-29 2022-12-23 2021-09-21 2021-07-06