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摘要: const int Mod = 1e9 + 7; int n, m, d[1000010], fac[1000010], ifac[1000010], h[1000010], stl[1010][1010], stl1[50010][205]; int qp(int x, int y){ // 快速 阅读全文
posted @ 2025-08-12 18:33 Hty111 阅读(5) 评论(0) 推荐(0)