diff --git a/BZOJ/4517/4517.cpp b/BZOJ/4517/4517.cpp new file mode 100644 index 00000000..94115b9e --- /dev/null +++ b/BZOJ/4517/4517.cpp @@ -0,0 +1,49 @@ +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 1e6 + 5; +const int mod = 1e9 + 7; + +int t, n, m, fac[N], inv[N], fac_inv[N], d[N]; + +inline int C(int n, int m) { + return static_cast(fac[n]) * fac_inv[m] % mod * fac_inv[n - m] % mod; +} + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + fac[0] = 1; + for (int i = 1; i < N; i++) { + fac[i] = static_cast(fac[i - 1]) * i % mod; + } + + inv[0] = inv[1] = 1; + for (int i = 2; i < N; i++) { + inv[i] = static_cast(mod - (mod / i)) * inv[mod % i] % mod; + } + + fac_inv[0] = fac_inv[1] = 1; + for (int i = 2; i < N; i++) { + fac_inv[i] = static_cast(fac_inv[i - 1]) * inv[i] % mod; + } + + d[2] = 1; + for (int i = 3; i < N; i++) { + d[i] = static_cast(i - 1) * (d[i - 1] + d[i - 2]) % mod; + } + + cin >> t; + + while (t--) { + cin >> n >> m; + + cout << (n == m ? 1 : static_cast(d[n - m]) * C(n, m) % mod) << endl; + } + + return 0; +} diff --git a/BZOJ/4517/data/1.in b/BZOJ/4517/data/1.in new file mode 100644 index 00000000..d1d6660c --- /dev/null +++ b/BZOJ/4517/data/1.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:dfaf0e3db0ae925388070f02778894cde405ed14d005a415435d76384e4f3204 +size 4005 diff --git a/BZOJ/4517/data/1.out b/BZOJ/4517/data/1.out new file mode 100644 index 00000000..91f294ff --- /dev/null +++ b/BZOJ/4517/data/1.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:1c6c1010d3f714fa5dd4988ea108be82dcc1ac3bf68b4eb46318b1ce4530ac09 +size 2741 diff --git a/BZOJ/4517/data/10.in b/BZOJ/4517/data/10.in new file mode 100644 index 00000000..b0ba7566 --- /dev/null +++ b/BZOJ/4517/data/10.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:3ce7b9d75f6bb7d0df708441859bdb80bbfb6f594153321f70d7f9064a15fd84 +size 5604 diff --git 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