結果
問題 | No.1126 SUM |
ユーザー |
![]() |
提出日時 | 2023-04-07 00:18:26 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 7 ms / 1,000 ms |
コード長 | 4,709 bytes |
コンパイル時間 | 765 ms |
コンパイル使用メモリ | 81,140 KB |
最終ジャッジ日時 | 2025-02-11 23:33:02 |
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
other | AC * 26 |
ソースコード
#include <algorithm>#include <iostream>#include <numeric>#include <string>#include <tuple>#include <utility>#include <vector>#include <limits>#define rep(i, a, b) for (int i = int(a); i < int(b); i++)using namespace std;using ll = long long int; // NOLINTusing P = pair<ll, ll>;// clang-format off#ifdef _DEBUG_#define dump(...) do{ cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = "; debug_print(__VA_ARGS__); } while(false)template<typename T, typename... Ts> void debug_print(const T &t, const Ts &...ts) { cerr << t; ((cerr << ", " << ts), ...); cerr << endl; }#else#define dump(...) do{ } while(false)#endiftemplate<typename T> vector<T> make_v(size_t a, T b) { return vector<T>(a, b); }template<typename... Ts> auto make_v(size_t a, Ts... ts) { return vector<decltype(make_v(ts...))>(a, make_v(ts...)); }template<typename T> bool chmin(T &a, const T& b) { if (a > b) {a = b; return true; } return false; }template<typename T> bool chmax(T &a, const T& b) { if (a < b) {a = b; return true; } return false; }template<typename T, typename... Ts> void print(const T& t, const Ts&... ts) { cout << t; ((cout << ' ' << ts), ...); cout << '\n'; }template<typename... Ts> void input(Ts&... ts) { (cin >> ... >> ts); }template<typename T> istream &operator,(istream &in, T &t) { return in >> t; }struct Inf { template<typename T> constexpr operator T() { return numeric_limits<T>::max() / 2; } };// clang-format ontemplate<ll MOD>class ModInt {ll n;auto constexpr inverse() const {return this->pow(*this, this->mod - 2);}public:constexpr static ll mod = MOD;using mint = ModInt<MOD>;constexpr ModInt() : n(0) {}constexpr ModInt(const ll &nn) : n(((nn % MOD) + MOD) % MOD) {}constexpr mint operator+=(const mint &m) {n += m.n;if (n >= mint::mod) n -= mint::mod;return *this;}constexpr mint operator-=(const mint &m) {n -= m.n;if (n < 0) n += mint::mod;return *this;}constexpr mint operator*=(const mint &m) {n *= m.n;if (n >= mint::mod) n %= mint::mod;return *this;}constexpr mint operator/=(const mint &m) {return (*this) *= m.inverse();}friend constexpr mint operator+(mint t, const mint &m) {return t += m;}friend constexpr mint operator-(mint t, const mint &m) {return t -= m;}friend constexpr mint operator*(mint t, const mint &m) {return t *= m;}friend constexpr mint operator/(mint t, const mint &m) {return t /= m;}constexpr mint operator=(const ll &l) {n = l % mint::mod;if (n < 0) n += mint::mod;return *this;}friend ostream &operator<<(ostream &out, const mint &m) {out << m.n;return out;}friend istream &operator>>(istream &in, mint &m) {ll l;in >> l;m = l;return in;}static constexpr auto pow(const mint &x, ll p) {mint ans = 1;for (auto m = x; p > 0; p /= 2, m *= m) {if (p % 2) ans *= m;}return ans;}constexpr ll get_raw() const {return n;}};using mint = ModInt<1000000007>::mint;constexpr mint operator"" _m(unsigned long long m) {return mint(m);}class Combination {vector<mint> factor, rfactor;public:Combination(int n) {factor.resize(n, 1);rfactor.resize(n, 1);for (int i = 1; i < n; i++) {factor[i] = i * factor[i - 1];}rfactor[n - 1] = 1 / factor[n - 1];for (int i = n - 1; i > 0; i--) {rfactor[i - 1] = rfactor[i] * i;}}mint nCr(int n, int r) {if (n < r) return 0;if (n < mint::mod) return factor[n] * rfactor[r] * rfactor[n - r];// Lucasの定理mint res = 1;while (n || r) {int nn = n % mint::mod, rr = r % mint::mod;n /= mint::mod;r /= mint::mod;res *= nCr(nn, rr);}return res;}mint nPr(int n, int r) {return factor[n] * rfactor[n - r];}mint nSr(ll n, int r) {mint ans = 0;for (int i = r, s = 1; i >= 0; i--, s *= -1) {ans += s * nCr(r, i) * mint::pow(i, n);}return ans * rfactor[r];}mint factorial(int n) {return factor[n];}};int main() {cin.tie(nullptr);ios::sync_with_stdio(false);int n, m;cin >> n >> m;Combination comb(n + m + 10);mint ans = 0;rep(i, n, m + 1) {ans += comb.nCr(i, n);}print(ans);return 0;}