摘要：
const int Maxn = 1e5 + 5; const LL Mod = 998244353; struct Cantor { int n; int c[Maxn], BIT[Maxn], Bit[Maxn]; LL order, fac[Maxn]; Cantor () { memset 阅读全文
摘要：
const int Maxn = 1e5 + 5;const LL Mod = 998244353;struct Cantor { ... 阅读全文