#433707 (C++14) No.3046 yukicoderの過去問

提出ソース
結果

問題	No.3046 yukicoderの過去問
ユーザー	kyon2326
提出日時	2020-02-23 13:33:44
言語	C++14 (gcc 12.3.0 + boost 1.83.0)
結果	AC
実行時間	154 ms / 2,000 ms
コード長	19,359 bytes
コンパイル時間	2,398 ms
コンパイル使用メモリ	191,252 KB
実行使用メモリ	26,456 KB
最終ジャッジ日時	2024-04-18 08:33:18
合計ジャッジ時間	3,443 ms
ジャッジサーバーID （参考情報）	judge3 / judge4
このコードへのチャレンジ
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テストケース

テストケース表示
入力	結果	実行時間実行使用メモリ
testcase_00	AC	1 ms 6,812 KB
testcase_01	AC	2 ms 6,940 KB
testcase_02	AC	2 ms 6,944 KB
testcase_03	AC	119 ms 26,456 KB
testcase_04	AC	2 ms 6,940 KB
testcase_05	AC	127 ms 26,348 KB
testcase_06	AC	148 ms 26,208 KB
testcase_07	AC	139 ms 26,308 KB
testcase_08	AC	154 ms 26,256 KB
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ソースコード

raw source code
#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL_DEV
	void debug_impl() { std::cerr << '\n'; }
	template<typename Head, typename... Tail> void debug_impl(Head head, Tail... tail) { std::cerr << " " << head << (sizeof...(tail) ? "," : ""); debug_impl(tail...); }
	#define debug(...) do { std::cerr << "(" << #__VA_ARGS__ << ") ="; debug_impl(__VA_ARGS__); } while (false)
#else
	#define debug(...) do {} while (false)
#endif
#ifdef LOCAL_TEST
	#define BOOST_STACKTRACE_USE_ADDR2LINE
	#define BOOST_STACKTRACE_ADDR2LINE_LOCATION /usr/local/opt/binutils/bin/addr2line
	#define _GNU_SOURCE
	#include <boost/stacktrace.hpp>
	namespace std {
		template<typename T> class dvector : public std::vector<T> {
		public:
			dvector() : std::vector<T>() {}
			explicit dvector(size_t n, const T& value = T()) : std::vector<T>(n, value) {}
			dvector(const std::vector<T>& v) : std::vector<T>(v) {}
			dvector(const std::initializer_list<T> il) : std::vector<T>(il) {}
			dvector(const typename std::vector<T>::iterator first, const typename std::vector<T>::iterator last) : std::vector<T>(first, last) {}
			dvector(const typename std::vector<T>::const_iterator first, const typename std::vector<T>::const_iterator last) : std::vector<T>(first, last) {}
			dvector(const std::string::iterator first, const std::string::iterator last) : std::vector<T>(first, last) {}
			T& operator[](size_t n) {
				try { return this->at(n); } catch (const std::exception& e) {
					std::cerr << boost::stacktrace::stacktrace() << '\n'; return this->at(n);
				}
			}
			const T& operator[](size_t n) const {
				try { return this->at(n); } catch (const std::exception& e) {
					std::cerr << boost::stacktrace::stacktrace() << '\n'; return this->at(n);
				}
			}
		};
	}
	class dbool {
	private:
		bool boolvalue;
	public:
		dbool() : boolvalue(false) {}
		dbool(bool b) : boolvalue(b) {}
		dbool(const dbool& b) : boolvalue(b.boolvalue) {}
		operator bool&() { return boolvalue; }
		operator const bool&() const { return boolvalue; }
	};
	template<typename T> std::ostream& operator<<(std::ostream& s, const std::dvector<T>& v) {
		for (size_t i = 0; i < v.size(); ++i){ s << v[i]; if (i < v.size() - 1) s << "\t"; } return s; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const std::dvector<std::dvector<T>>& vv) {
		s << "\n"; for (size_t i = 0; i < vv.size(); ++i){ s << vv[i] << "\n"; } return s; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const std::set<T>& se) {
		s << "{ "; for (auto itr = se.begin(); itr != se.end(); ++itr){ s << (*itr) << "\t"; } s << "}"; return s; }
	template<typename T> std::ostream& operator<<(std::ostream& s, const std::multiset<T>& se) {
		s << "{ "; for (auto itr = se.begin(); itr != se.end(); ++itr){ s << (*itr) << "\t"; } s << "}"; return s; }
	template <typename T, size_t N> std::ostream& operator<<(std::ostream& s, const std::array<T, N>& a) {
		s << "{ "; for (size_t i = 0; i < N; ++i){ s << a[i] << "\t"; } s << "}"; return s; }
	template<typename T1, typename T2> std::ostream& operator<<(std::ostream& s, const std::map<T1, T2>& m) {
		s << "{\n"; for (auto itr = m.begin(); itr != m.end(); ++itr){ s << "\t" << (*itr).first << " : " << (*itr).second << "\n"; } s << "}"; return s; }
	template<typename T1, typename T2> std::ostream& operator<<(std::ostream& s, const std::pair<T1, T2>& p) {
		return s << "(" << p.first << ", " << p.second << ")"; }
	#define vector dvector
	#define bool dbool
	class SIGFPE_exception : std::exception {};
	class SIGSEGV_exception : std::exception {};
	void catch_SIGFPE(int e) { std::cerr << boost::stacktrace::stacktrace() << '\n'; throw SIGFPE_exception();	}
	void catch_SIGSEGV(int e) { std::cerr << boost::stacktrace::stacktrace() << '\n'; throw SIGSEGV_exception(); }
	signed convertedmain();
	signed main() { signal(SIGFPE, catch_SIGFPE); signal(SIGSEGV, catch_SIGSEGV); return convertedmain(); }
	#define main() convertedmain()
#endif
//#define int long long
using ll = long long;
//constexpr int INF = 1e9;//INT_MAX=(1<<31)-1=2147483647
constexpr ll INF = (ll)1e18;//(1LL<<63)-1=9223372036854775807
constexpr ll MOD = (ll)1e9 + 7;
constexpr double EPS = 1e-9;
constexpr ll dx[4] = {1LL, 0LL, -1LL, 0LL};
constexpr ll dy[4] = {0LL, 1LL, 0LL, -1LL};
constexpr ll dx8[8] = {1LL, 0LL, -1LL, 0LL, 1LL, 1LL, -1LL, -1LL};
constexpr ll dy8[8] = {0LL, 1LL, 0LL, -1LL, 1LL, -1LL, 1LL, -1LL};
#define rep(i, n)   for(ll i=0, i##_length=(n); i< i##_length; ++i)
#define repeq(i, n) for(ll i=1, i##_length=(n); i<=i##_length; ++i)
#define rrep(i, n)   for(ll i=(n)-1; i>=0; --i)
#define rrepeq(i, n) for(ll i=(n)  ; i>=1; --i)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
void p() { std::cout << '\n'; }
template<typename Head, typename... Tail> void p(Head head, Tail... tail) { std::cout << head << (sizeof...(tail) ? " " : ""); p(tail...); }
template<typename T> inline void pv(std::vector<T>& v) { for(ll i=0, N=v.size(); i<N; i++) std::cout << v[i] << " \n"[i==N-1]; }
template<typename T> inline T gcd(T a, T b) { return b ? gcd(b,a%b) : a; }
template<typename T> inline T lcm(T a, T b) { return a / gcd(a,  b) * b; }
template<typename T> inline bool chmax(T& a, T b) { return a < b && (a = b, true); }
template<typename T> inline bool chmin(T& a, T b) { return a > b && (a = b, true); }
template<typename T> inline void uniq(std::vector<T>& v) { v.erase(std::unique(v.begin(), v.end()), v.end()); }

/*-----8<-----template-----8<-----*/

inline constexpr ll extgcd(ll a, ll b, ll &x, ll &y){ ll g = a; x = 1; y = 0; if(b){ g = extgcd(b, a % b, y, x); y -= a / b * x; } return g; }
inline constexpr ll invmod(ll a, ll m = MOD){ ll x = 0, y = 0; extgcd(a, m, x, y); return (x + m) % m; }
class Modint{
public:
	ll _num;
	constexpr Modint() : _num() { _num = 0; }
	constexpr Modint(ll x) : _num() { _num = x % MOD; if(_num < 0) _num += MOD; }
	inline constexpr Modint operator= (int x){ _num = x % MOD; if(_num<0) _num += MOD; return *this; }
	inline constexpr Modint operator= (ll x){ _num = x % MOD; if(_num<0) _num += MOD; return *this; }
	inline constexpr Modint operator= (Modint x){ _num = x._num; return *this; }
	inline constexpr Modint operator+ (int x){ return Modint(_num + x); }
	inline constexpr Modint operator+ (ll x){ return Modint(_num + x); }
	inline constexpr Modint operator+ (Modint x){ ll a = _num + x._num; if(a >= MOD) a -= MOD; return Modint{a}; }
	inline constexpr Modint operator+=(int x){ _num += x; _num %= MOD; if(_num < 0) _num += MOD; return *this; }
	inline constexpr Modint operator+=(ll x){ _num += x; _num %= MOD; if(_num < 0) _num += MOD; return *this; }
	inline constexpr Modint operator+=(Modint x){ _num += x._num; if(_num >= MOD) _num -= MOD; return *this; }
	inline constexpr Modint operator++(){ _num++; if(_num == MOD) _num = 0; return *this; }
	inline constexpr Modint operator- (int x){ return Modint(_num - x); }
	inline constexpr Modint operator- (ll x){ return Modint(_num - x); }
	inline constexpr Modint operator- (Modint x){ ll a = _num - x._num; if(a < 0) a += MOD; return Modint{a}; }
	inline constexpr Modint operator-=(int x){ _num -= x; _num %= MOD; if(_num < 0) _num += MOD; return *this; }
	inline constexpr Modint operator-=(ll x){ _num -= x; _num %= MOD; if(_num < 0) _num += MOD; return *this; }
	inline constexpr Modint operator-=(Modint x){ _num -= x._num; if(_num < 0) _num += MOD; return *this; }
	inline constexpr Modint operator--(){ _num--; if(_num == -1) _num = MOD - 1; return *this; }
	inline constexpr Modint operator* (int x){ return Modint(_num * (x % MOD)); }
	inline constexpr Modint operator* (ll x){ return Modint(_num * (x % MOD)); }
	inline constexpr Modint operator* (Modint x){ return Modint{_num * x._num % MOD}; }
	inline constexpr Modint operator*=(int x){ _num *= Modint(x); _num %= MOD; return *this; }
	inline constexpr Modint operator*=(ll x){ _num *= Modint(x); _num %= MOD; return *this; }
	inline constexpr Modint operator*=(Modint x){ _num *= x._num; _num %= MOD; return *this; }
	inline constexpr Modint operator/ (int x){ return Modint(_num * invmod(Modint(x), MOD)); }
	inline constexpr Modint operator/ (ll x){ return Modint(_num * invmod(Modint(x), MOD)); }
	inline constexpr Modint operator/ (Modint x){ return Modint{_num * invmod(x._num, MOD) % MOD}; }
	inline constexpr Modint operator/=(int x){ _num *= invmod(Modint(x), MOD); _num %= MOD; return *this; }
	inline constexpr Modint operator/=(ll x){ _num *= invmod(Modint(x), MOD); _num %= MOD; return *this; }
	inline constexpr Modint operator/=(Modint x){ _num *= invmod(x._num, MOD); _num %= MOD; return *this; }
	inline constexpr Modint pow(ll n){ ll i = 1, x = n>=0 ? n : -n; Modint ans = 1, cnt = n>=0 ? *this : Modint(1) / *this; while(i <= x){ if(x & i){ ans *= cnt; x ^= i; } cnt *= cnt; i *= 2; } return ans; }
	inline constexpr operator ll() const { return _num; }
};
inline std::istream& operator>>(std::istream &s, Modint &x){ ll t; s>>t; x=t; return s; }
vector<Modint> fac(1, 1), inv(1, 1);
inline void reserve(size_t a){
	if(fac.size() >= a) return;
	if(a < fac.size() * 2) a = fac.size() * 2;
	if(a >= MOD) a = MOD;
	while(fac.size() < a) fac.push_back(fac.back() * ll(fac.size()));
	inv.resize(fac.size());
	inv.back() = Modint(1) / fac.back();
	for(ll i = inv.size() - 1; !inv[i - 1]; i--) inv[i - 1] = inv[i] * i;
}
inline Modint factorial(ll n){ if(n < 0) return 0; reserve(n + 1); return fac[n]; }
inline Modint nPk_loop(ll n, ll k){ if(n<k) return 0; Modint val(1); for(ll i=n;i>(n-k);i--)val*=i; return val; }
inline Modint nCk_loop(ll n, ll k){ if(n<k) return 0; Modint val(1); k=min(k,n-k); for(ll i=n;i>(n-k);i--)val*=i; for(ll i=k;i>1;i--)val/=i; return val; };
inline Modint nPk(ll n, ll k){ if(k < 0 || n < k) return 0; if(n>=(ll)1e7) return nPk_loop(n, k); reserve(n + 1); return fac[n] * inv[n - k]; }
inline Modint nCk(ll n, ll k){ if(k < 0 || n < k) return 0; if(n>=(ll)1e7) return nCk_loop(n, k); reserve(n + 1); return fac[n] * inv[k] * inv[n - k]; }
inline Modint nHk(ll n, ll k){ return nCk(n + k - 1, k); } //n種類のものから重複を許してk個選ぶ=玉k個と仕切りn-1個

/*
nCk：n!が間に合わないくらい巨大でkが小さいとき、素直に計算すると間に合う のは1e7以上に組み込んであります
	auto f = [](ll n, ll k){
		if(n<k)return Modint(0);
		Modint val(1);
		k=min(k,n-k);
		for(ll i=n;i>(n-k);i--)val*=i;
		for(ll i=k;i>1;i--)val/=i;
		return val;
	};
*/


////


template< typename T >
struct FormalPowerSeries : vector< T > {
	using vector< T >::vector;
	using P = FormalPowerSeries;


	using MULT = function< P(P, P) >;

	static MULT &get_mult() {
		static MULT mult = nullptr;
		return mult;
	}

	static void set_fft(MULT f) {
		get_mult() = f;
	}

	FormalPowerSeries(const vector< T > &v) : FormalPowerSeries(v.begin(), v.end()) {}

	P operator+(const P &r) const { return P(*this) += r; }

	P operator-(const P &r) const { return P(*this) -= r; }

	P operator*(const P &r) const { return P(*this) *= r; }

	P operator*(const T &v) const { return P(*this) *= v; }

	P operator/(const P &r) const { return P(*this) /= r; }

	P &operator+=(const P &r) {
		if(r.size() > this->size()) this->resize(r.size());
		for(int i = 0; i < r.size(); i++) (*this)[i] += r[i];
		return *this;
	}

	P &operator-=(const P &r) {
		if(r.size() > this->size()) this->resize(r.size());
		for(int i = 0; i < (int)r.size(); i++) (*this)[i] -= r[i];
		return *this;
	}

	P &operator*=(const T &v) {
		const int n = (int) this->size();
		for(int k = 0; k < n; k++) (*this)[k] *= v;
		return *this;
	}

	P &operator*=(const P &r) {
		if(this->empty() || r.empty()) {
			this->clear();
			return *this;
		}
		assert(get_mult() != nullptr);
		auto ret = get_mult()(*this, r);
		this->resize(ret.size());
		for(int k = 0; k < (int)ret.size(); k++) (*this)[k] = ret[k];
		return *this;
	}

	P operator-() const {
		P ret(this->size());
		for(int i = 0; i < this->size(); i++) ret[i] = -(*this)[i];
		return ret;
	}

	P &operator/=(const P &r) {
		return *this *= r.inverse();
	}

	P pre(int sz) const {
		return P(begin(*this), begin(*this) + min((int) this->size(), sz));
	}

	P rev() const {
		P ret(*this);
		reverse(begin(ret), end(ret));
		return ret;
	}

	P diff() const {
		const int n = (int) this->size();
		P ret(max(0, n - 1));
		for(int i = 1; i < n; i++) ret[i] = (*this)[i] * T(i);
		return ret;
	}

	P integral() const {
		const int n = (int) this->size();
		P ret(n + 1);
		ret[0] = T(0);
		for(int i = 0; i < n; i++) ret[i + 1] = (*this)[i] / T(i + 1);
	}

	// F(0) must not be 0
	P inv(int deg = -1) const {
		assert(((*this)[0]) != T(0));
		const int n = (int) this->size();
		if(deg == -1) deg = n;
		P ret({T(1) / (*this)[0]});
		for(int i = 1; i < deg; i <<= 1) {
			ret = (ret * T(2) - ret * ret * pre(i << 1)).pre(i << 1);
		}
		return ret.pre(deg);
	}

	// F(0) must be 1
	P log(int deg = -1) const {
		assert((*this)[0] == 1);
		const int n = (int) this->size();
		if(deg == -1) deg = n;
		return (this->diff() * this->inv(deg)).integral().pre(deg);
	}

	// F(0) must be 1
	P sqrt(int deg = -1) const {
		assert((*this)[0] == T(1));
		const int n = (int) this->size();
		if(deg == -1) deg = n;
		P ret({T(1)});
		T inv2 = T(1) / T(2);
		for(int i = 1; i < deg; i <<= 1) {
			ret = (ret + pre(i << 1) * ret.inv(i << 1)).pre(i << 1) * 2;
		}
		return ret.pre(deg);
	}

	// F(0) must be 0
	P exp(int deg) const {
		assert((*this)[0] == T(0));
		const int n = (int) this->size();
		P ret({T(1)}), g({T(1)});
		for(int i = 1; i < deg; i <<= 1) {
			ret = (ret * (pre(1 << i) + g) - ret.log(1 << i)).pre(1 << i);
		}
		return ret.pre(deg);
	}
};


namespace FastFourierTransform {
	using real = double;

	struct C {
		real x, y;

		C() : x(0), y(0) {}

		C(real x, real y) : x(x), y(y) {}

		inline C operator+(const C &c) const { return C(x + c.x, y + c.y); }

		inline C operator-(const C &c) const { return C(x - c.x, y - c.y); }

		inline C operator*(const C &c) const { return C(x * c.x - y * c.y, x * c.y + y * c.x); }

		inline C conj() const { return C(x, -y); }
	};

	const real PI = acosl(-1);
	int base = 1;
	vector< C > rts = {{0, 0},
										 {1, 0}};
	vector< int > rev = {0, 1};


	void ensure_base(int nbase) {
		if(nbase <= base) return;
		rev.resize(1 << nbase);
		rts.resize(1 << nbase);
		for(int i = 0; i < (1 << nbase); i++) {
			rev[i] = (rev[i >> 1] >> 1) + ((i & 1) << (nbase - 1));
		}
		while(base < nbase) {
			real angle = PI * 2.0 / (1 << (base + 1));
			for(int i = 1 << (base - 1); i < (1 << base); i++) {
				rts[i << 1] = rts[i];
				real angle_i = angle * (2 * i + 1 - (1 << base));
				rts[(i << 1) + 1] = C(cos(angle_i), sin(angle_i));
			}
			++base;
		}
	}

	void fft(vector< C > &a, int n) {
		assert((n & (n - 1)) == 0);
		int zeros = __builtin_ctz(n);
		ensure_base(zeros);
		int shift = base - zeros;
		for(int i = 0; i < n; i++) {
			if(i < (rev[i] >> shift)) {
				swap(a[i], a[rev[i] >> shift]);
			}
		}
		for(int k = 1; k < n; k <<= 1) {
			for(int i = 0; i < n; i += 2 * k) {
				for(int j = 0; j < k; j++) {
					C z = a[i + j + k] * rts[j + k];
					a[i + j + k] = a[i + j] - z;
					a[i + j] = a[i + j] + z;
				}
			}
		}
	}

	vector< int64_t > multiply(const vector< int > &a, const vector< int > &b) {
		int need = (int) a.size() + (int) b.size() - 1;
		int nbase = 1;
		while((1 << nbase) < need) nbase++;
		ensure_base(nbase);
		int sz = 1 << nbase;
		vector< C > fa(sz);
		for(int i = 0; i < sz; i++) {
			int x = (i < (int) a.size() ? a[i] : 0);
			int y = (i < (int) b.size() ? b[i] : 0);
			fa[i] = C(x, y);
		}
		fft(fa, sz);
		C r(0, -0.25 / (sz >> 1)), s(0, 1), t(0.5, 0);
		for(int i = 0; i <= (sz >> 1); i++) {
			int j = (sz - i) & (sz - 1);
			C z = (fa[j] * fa[j] - (fa[i] * fa[i]).conj()) * r;
			fa[j] = (fa[i] * fa[i] - (fa[j] * fa[j]).conj()) * r;
			fa[i] = z;
		}
		for(int i = 0; i < (sz >> 1); i++) {
			C A0 = (fa[i] + fa[i + (sz >> 1)]) * t;
			C A1 = (fa[i] - fa[i + (sz >> 1)]) * t * rts[(sz >> 1) + i];
			fa[i] = A0 + A1 * s;
		}
		fft(fa, sz >> 1);
		vector< int64_t > ret(need);
		for(int i = 0; i < need; i++) {
			ret[i] = llround(i & 1 ? fa[i >> 1].y : fa[i >> 1].x);
		}
		return ret;
	}
};

template< typename T >
struct ArbitraryModConvolution {
	using real = FastFourierTransform::real;
	using C = FastFourierTransform::C;

	ArbitraryModConvolution() = default;

	vector< T > multiply(const vector< T > &a, const vector< T > &b, int need = -1) {
		if(need == -1) need = a.size() + b.size() - 1;
		int nbase = 0;
		while((1 << nbase) < need) nbase++;
		FastFourierTransform::ensure_base(nbase);
		int sz = 1 << nbase;
		vector< C > fa(sz);
		for(int i = 0; i < (int)a.size(); i++) {
			fa[i] = C(a[i]._num & ((1 << 15) - 1), a[i]._num >> 15);
		}
		fft(fa, sz);
		vector< C > fb(sz);
		if(a == b) {
			fb = fa;
		} else {
			for(int i = 0; i < (int)b.size(); i++) {
				fb[i] = C(b[i]._num & ((1 << 15) - 1), b[i]._num >> 15);
			}
			fft(fb, sz);
		}
		real ratio = 0.25 / sz;
		C r2(0, -1), r3(ratio, 0), r4(0, -ratio), r5(0, 1);
		for(int i = 0; i <= (sz >> 1); i++) {
			int j = (sz - i) & (sz - 1);
			C a1 = (fa[i] + fa[j].conj());
			C a2 = (fa[i] - fa[j].conj()) * r2;
			C b1 = (fb[i] + fb[j].conj()) * r3;
			C b2 = (fb[i] - fb[j].conj()) * r4;
			if(i != j) {
				C c1 = (fa[j] + fa[i].conj());
				C c2 = (fa[j] - fa[i].conj()) * r2;
				C d1 = (fb[j] + fb[i].conj()) * r3;
				C d2 = (fb[j] - fb[i].conj()) * r4;
				fa[i] = c1 * d1 + c2 * d2 * r5;
				fb[i] = c1 * d2 + c2 * d1;
			}
			fa[j] = a1 * b1 + a2 * b2 * r5;
			fb[j] = a1 * b2 + a2 * b1;
		}
		fft(fa, sz);
		fft(fb, sz);
		vector< T > ret(need);
		for(int i = 0; i < need; i++) {
			int64_t aa = llround(fa[i].x);
			int64_t bb = llround(fb[i].x);
			int64_t cc = llround(fa[i].y);
			aa = T(aa)._num, bb = T(bb)._num, cc = T(cc)._num;
			ret[i] = T(aa + (bb << 15) + (cc << 30));
		}
		return ret;
	}
};

//partition(N): [0,N] の分割数を返す。
//計算量：O(NlogN)
template< typename T >
FormalPowerSeries< T > partition(int N) {
	ArbitraryModConvolution< Modint > fft;
	using FPS = FormalPowerSeries< Modint >;
	auto mult = [&](const FPS::P &a, const FPS::P &b) { return fft.multiply(a, b); };
	FPS::set_fft(mult);

	FormalPowerSeries< T > po(N + 1);
	po[0] = 1;
	for(int k = 1; k <= N; k++) {
		if(1LL * k * (3 * k + 1) / 2 <= N) po[k * (3 * k + 1) / 2] += (k % 2 ? -1 : 1);
		if(1LL * k * (3 * k - 1) / 2 <= N) po[k * (3 * k - 1) / 2] += (k % 2 ? -1 : 1);
	}
	return po.inv();
}

/*-----8<-----library-----8<-----*/

//https://yukicoder.me/problems/no/3046
void yuki3046() {

	ArbitraryModConvolution< Modint > fft;
	using FPS = FormalPowerSeries< Modint >;
	auto mult = [&](const FPS::P &a, const FPS::P &b) { return fft.multiply(a, b); };
	FPS::set_fft(mult);

	ll K, N;
	cin >> K >> N;

	//f(T)=(T^(進める歩数1) + T^(進める歩数2) + ... )とすると、
	//求めたいのは 1 + f(T) + f(T)^2 + ... = 1/(1-f(T))
	//まず X に 1-f(T) をつくる
	FormalPowerSeries<Modint> X(K + 1);
	X[0] = 1;
	for(ll i = 0; i < N; i++) {
		ll t;
		cin >> t;
		if(t <= K) X[t] = -1;
	}

	//1/(1-f(T))
	FormalPowerSeries<Modint> v = X.inv(K + 1);

	//x^Kの係数が解となる
	Modint ans = v[K];
	cout << ans << endl;
}

void bunkatsusu(){
	FormalPowerSeries<Modint> partitionv = partition<Modint>(10);
	debug(partitionv);
}

signed main() {
	yuki3046();
	//bunkatsusu();

	return 0;
}