// line 2 "/home/seekworser/.cpp_lib/competitive_library/competitive/std/std.hpp" #include #ifndef LOCAL_TEST #pragma GCC target ("avx") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #endif // LOCAL_TEST using namespace std; // shorten typenames using ll = long long; using pii = pair; using pll = pair; using vi = vector; using vvi = vector; using vvvi = vector; using vl = vector; using vvl = vector; using vvvl = vector; using vb = vector; using vvb = vector; using vvvb = vector; using vc = vector; using vvc = vector; using vvvc = vector; using vd = vector; using vvd = vector; using vvvd = vector; using vs = vector; using vvs = vector>; using vvvs = vector>>; template vector> vv(int h, int w, T val = T()) { return vector(h, vector(w, val)); } template vector>> vvv(int h1, int h2, int h3, T val = T()) { return vector(h1, vector(h2, vector(h3, val))); } template vector>>> vvvv(int h1, int h2, int h3, int h4, T val = T()) { return vector(h1, vector(h2, vector(h3, vector(h4, val)))); } template using priority_queue_min = priority_queue, greater>; // define CONSTANTS constexpr double PI = 3.14159265358979323; constexpr int INF = 100100111; constexpr ll INFL = 3300300300300300491LL; float EPS = 1e-8; double EPSL = 1e-10; template bool eq(const T x, const T y) { return x == y; } template<> bool eq(const double x, const double y) { return (abs(x - y) < EPSL * x || abs(x - y) < EPSL); } template<> bool eq(const float x, const float y) { return abs(x - y) < EPS * x; } template bool neq(const T x, const T y) { return !(eq(x, y)); } template bool ge(const T x, const T y) { return (eq(x, y) || (x > y)); } template bool le(const T x, const T y) { return (eq(x, y) || (x < y)); } template bool gt(const T x, const T y) { return !(le(x, y)); } template bool lt(const T x, const T y) { return !(ge(x, y)); } constexpr int MODINT998244353 = 998244353; constexpr int MODINT1000000007 = 1000000007; // fasten io struct Nyan { Nyan() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(18); } } nyan; // define macros #define all(a) (a).begin(), (a).end() #define sz(x) ((ll)(x).size()) #define rep1(n) for(ll dummy_iter = 0LL; dummy_iter < n; ++dummy_iter) // 0,1,...,n-1 #define rep2(i, n) for(ll i = 0LL, i##_counter = 0LL; i##_counter < ll(n); ++(i##_counter), (i) = i##_counter) // i=0,1,...,n-1 #define rep3(i, s, t) for(ll i = ll(s), i##_counter = ll(s); i##_counter < ll(t); ++(i##_counter), (i) = (i##_counter)) // i=s,s+1,...,t-1 #define rep4(i, s, t, step) for(ll i##_counter = step > 0 ? ll(s) : -ll(s), i##_end = step > 0 ? ll(t) : -ll(t), i##_step = abs(step), i = ll(s); i##_counter < i##_end; i##_counter += i##_step, i = step > 0 ? i##_counter : -i##_counter) // i=s,s+step,..., T max(array& a) { return *max_element(all(a)); }; template T min(array& a) { return *min_element(all(a)); }; template T max(vector& a) { return *max_element(all(a)); }; template T min(vector& a) { return *min_element(all(a)); }; template vector vec_slice(const vector& a, int l, int r) { vector rev; rep(i, l, r) rev.push_back(a[i]); return rev; }; template T sum(vector& a, T zero = T(0)) { T rev = zero; rep(i, sz(a)) rev += a[i]; return rev; }; template bool in_range(const T& val, const T& s, const T& t) { return s <= val && val < t; }; template inline vector& operator--(vector& v) { repe(x, v) --x; return v; } template inline vector& operator++(vector& v) { repe(x, v) ++x; return v; } ll powm(ll a, ll n, ll mod=INFL) { ll res = 1; while (n > 0) { if (n & 1) res = (res * a) % mod; if (n > 1) a = (a * a) % mod; n >>= 1; } return res; } ll sqrtll(ll x) { assert(x >= 0); ll rev = sqrt(x); while(rev * rev > x) --rev; while((rev+1) * (rev+1)<=x) ++rev; return rev; } template inline bool chmax(T& M, const T& x) { if (M < x) { M = x; return true; } return false; } template inline bool chmin(T& m, const T& x) { if (m > x) { m = x; return true; } return false; } int digit(ll x, int d=10) { int rev=0; while (x > 0) { rev++; x /= d;}; return rev; } /** * @brief std.hpp * @docs docs/std/std.md */ // line 3 "/home/seekworser/.cpp_lib/competitive_library/competitive/math/fraction.hpp" struct Frac { ll num; ll den; Frac (ll _num, ll _den, bool reduce = true) : num(_num), den(_den) { if (reduce) (*this).reduce(); } Frac (ll _num) : Frac(_num, 1) {} static ll redcue_limit; Frac inv() const { return Frac((*this).den, (*this).num); } Frac &operator+=(const Frac &x) { (*this).num = (*this).num * x.den + x.num * (*this).den; (*this).den = (*this).den * x.den; if ((*this).den > redcue_limit || (*this).num > redcue_limit) (*this).reduce(); return (*this); } Frac &operator-=(const Frac &x) { (*this).num = (*this).num * x.den - x.num * (*this).den; (*this).den = (*this).den * x.den; if ((*this).den > redcue_limit || (*this).num > redcue_limit) (*this).reduce(); return (*this); } Frac &operator*=(const Frac &x) { (*this).num = (*this).num * x.num; (*this).den = (*this).den * x.den; if ((*this).den > redcue_limit || (*this).num > redcue_limit) (*this).reduce(); return (*this); } Frac &operator/=(const Frac &x) { (*this) *= x.inv(); if ((*this).den > redcue_limit || (*this).num > redcue_limit) (*this).reduce(); return (*this); } Frac operator+(const Frac &x) const { return (Frac(*this) += x); } Frac operator-(const Frac &x) const { return (Frac(*this) -= x); } Frac operator*(const Frac &x) const { return (Frac(*this) *= x); } Frac operator/(const Frac &x) const { return (Frac(*this) /= x); } Frac operator+() const { return *this; } Frac operator-() const { Frac x(-(*this).num, (*this).den); return x; } friend bool operator==(const Frac& lhs, const Frac& rhs) { return lhs.num * rhs.den == lhs.den * rhs.num; } friend bool operator!=(const Frac& lhs, const Frac& rhs) { return lhs.num * rhs.den != lhs.den * rhs.num; } friend bool operator>=(const Frac& lhs, const Frac& rhs) { return lhs.num * rhs.den >= lhs.den * rhs.num; } friend bool operator<=(const Frac& lhs, const Frac& rhs) { return lhs.num * rhs.den <= lhs.den * rhs.num; } friend bool operator>(const Frac& lhs, const Frac& rhs) { return lhs.num * rhs.den > lhs.den * rhs.num; } friend bool operator<(const Frac& lhs, const Frac& rhs) { return lhs.num * rhs.den < lhs.den * rhs.num; } double val() const {return (double)((*this).num) / (double)((*this).den); } friend ostream& operator<<(ostream& os, const Frac &x) { os << x.val(); return os; } void reduce() { assert((*this).den != 0 || (*this).num != 0); if ((*this).den == 0) { (*this).num = 1; return; } if ((*this).num == 0) { (*this).den = 1; return; } ll g = gcd((*this).num, (*this).den); (*this).num /= g; (*this).den /= g; if ((*this).den < 0) { (*this).num *= -1; (*this).den *= -1; } return; } }; ll Frac::redcue_limit = 1000000000; Frac pow(const Frac &a, ll n) { Frac res(1); Frac cur(a); while (n > 0) { if (n & 1) res *= cur; cur *= cur; n >>= 1; } return res; } Frac abs(const Frac &f) { Frac rev(f); if (rev.den * rev.num < 0) return -rev; return rev; } /** * @brief fraction.hpp * @docs docs/math/fraction.md */ // line 4 "/home/seekworser/.cpp_lib/competitive_library/atcoder/modint.hpp" #include #ifdef _MSC_VER #include #endif // line 3 "/home/seekworser/.cpp_lib/competitive_library/atcoder/internal_math.hpp" #ifdef _MSC_VER #include #endif namespace atcoder { namespace internal { // @param m `1 <= m` // @return x mod m constexpr long long safe_mod(long long x, long long m) { x %= m; if (x < 0) x += m; return x; } // Fast modular multiplication by barrett reduction // Reference: https://en.wikipedia.org/wiki/Barrett_reduction // NOTE: reconsider after Ice Lake struct barrett { unsigned int _m; unsigned long long im; // @param m `1 <= m < 2^31` explicit barrett(unsigned int m) : _m(m), im((unsigned long long)(-1) / m + 1) {} // @return m unsigned int umod() const { return _m; } // @param a `0 <= a < m` // @param b `0 <= b < m` // @return `a * b % m` unsigned int mul(unsigned int a, unsigned int b) const { // [1] m = 1 // a = b = im = 0, so okay // [2] m >= 2 // im = ceil(2^64 / m) // -> im * m = 2^64 + r (0 <= r < m) // let z = a*b = c*m + d (0 <= c, d < m) // a*b * im = (c*m + d) * im = c*(im*m) + d*im = c*2^64 + c*r + d*im // c*r + d*im < m * m + m * im < m * m + 2^64 + m <= 2^64 + m * (m + 1) < 2^64 * 2 // ((ab * im) >> 64) == c or c + 1 unsigned long long z = a; z *= b; #ifdef _MSC_VER unsigned long long x; _umul128(z, im, &x); #else unsigned long long x = (unsigned long long)(((unsigned __int128)(z)*im) >> 64); #endif unsigned int v = (unsigned int)(z - x * _m); if (_m <= v) v += _m; return v; } }; // @param n `0 <= n` // @param m `1 <= m` // @return `(x ** n) % m` constexpr long long pow_mod_constexpr(long long x, long long n, int m) { if (m == 1) return 0; unsigned int _m = (unsigned int)(m); unsigned long long r = 1; unsigned long long y = safe_mod(x, m); while (n) { if (n & 1) r = (r * y) % _m; y = (y * y) % _m; n >>= 1; } return r; } // Reference: // M. Forisek and J. Jancina, // Fast Primality Testing for Integers That Fit into a Machine Word // @param n `0 <= n` constexpr bool is_prime_constexpr(int n) { if (n <= 1) return false; if (n == 2 || n == 7 || n == 61) return true; if (n % 2 == 0) return false; long long d = n - 1; while (d % 2 == 0) d /= 2; constexpr long long bases[3] = {2, 7, 61}; for (long long a : bases) { long long t = d; long long y = pow_mod_constexpr(a, t, n); while (t != n - 1 && y != 1 && y != n - 1) { y = y * y % n; t <<= 1; } if (y != n - 1 && t % 2 == 0) { return false; } } return true; } template constexpr bool is_prime = is_prime_constexpr(n); // @param b `1 <= b` // @return pair(g, x) s.t. g = gcd(a, b), xa = g (mod b), 0 <= x < b/g constexpr std::pair inv_gcd(long long a, long long b) { a = safe_mod(a, b); if (a == 0) return {b, 0}; // Contracts: // [1] s - m0 * a = 0 (mod b) // [2] t - m1 * a = 0 (mod b) // [3] s * |m1| + t * |m0| <= b long long s = b, t = a; long long m0 = 0, m1 = 1; while (t) { long long u = s / t; s -= t * u; m0 -= m1 * u; // |m1 * u| <= |m1| * s <= b // [3]: // (s - t * u) * |m1| + t * |m0 - m1 * u| // <= s * |m1| - t * u * |m1| + t * (|m0| + |m1| * u) // = s * |m1| + t * |m0| <= b auto tmp = s; s = t; t = tmp; tmp = m0; m0 = m1; m1 = tmp; } // by [3]: |m0| <= b/g // by g != b: |m0| < b/g if (m0 < 0) m0 += b / s; return {s, m0}; } // Compile time primitive root // @param m must be prime // @return primitive root (and minimum in now) constexpr int primitive_root_constexpr(int m) { if (m == 2) return 1; if (m == 167772161) return 3; if (m == 469762049) return 3; if (m == 754974721) return 11; if (m == 998244353) return 3; int divs[20] = {}; divs[0] = 2; int cnt = 1; int x = (m - 1) / 2; while (x % 2 == 0) x /= 2; for (int i = 3; (long long)(i)*i <= x; i += 2) { if (x % i == 0) { divs[cnt++] = i; while (x % i == 0) { x /= i; } } } if (x > 1) { divs[cnt++] = x; } for (int g = 2;; g++) { bool ok = true; for (int i = 0; i < cnt; i++) { if (pow_mod_constexpr(g, (m - 1) / divs[i], m) == 1) { ok = false; break; } } if (ok) return g; } } template constexpr int primitive_root = primitive_root_constexpr(m); // @param n `n < 2^32` // @param m `1 <= m < 2^32` // @return sum_{i=0}^{n-1} floor((ai + b) / m) (mod 2^64) unsigned long long floor_sum_unsigned(unsigned long long n, unsigned long long m, unsigned long long a, unsigned long long b) { unsigned long long ans = 0; while (true) { if (a >= m) { ans += n * (n - 1) / 2 * (a / m); a %= m; } if (b >= m) { ans += n * (b / m); b %= m; } unsigned long long y_max = a * n + b; if (y_max < m) break; // y_max < m * (n + 1) // floor(y_max / m) <= n n = (unsigned long long)(y_max / m); b = (unsigned long long)(y_max % m); std::swap(m, a); } return ans; } } // namespace internal } // namespace atcoder // line 5 "/home/seekworser/.cpp_lib/competitive_library/atcoder/internal_type_traits.hpp" namespace atcoder { namespace internal { #ifndef _MSC_VER template using is_signed_int128 = typename std::conditional::value || std::is_same::value, std::true_type, std::false_type>::type; template using is_unsigned_int128 = typename std::conditional::value || std::is_same::value, std::true_type, std::false_type>::type; template using make_unsigned_int128 = typename std::conditional::value, __uint128_t, unsigned __int128>; template using is_integral = typename std::conditional::value || is_signed_int128::value || is_unsigned_int128::value, std::true_type, std::false_type>::type; template using is_signed_int = typename std::conditional<(is_integral::value && std::is_signed::value) || is_signed_int128::value, std::true_type, std::false_type>::type; template using is_unsigned_int = typename std::conditional<(is_integral::value && std::is_unsigned::value) || is_unsigned_int128::value, std::true_type, std::false_type>::type; template using to_unsigned = typename std::conditional< is_signed_int128::value, make_unsigned_int128, typename std::conditional::value, std::make_unsigned, std::common_type>::type>::type; #else template using is_integral = typename std::is_integral; template using is_signed_int = typename std::conditional::value && std::is_signed::value, std::true_type, std::false_type>::type; template using is_unsigned_int = typename std::conditional::value && std::is_unsigned::value, std::true_type, std::false_type>::type; template using to_unsigned = typename std::conditional::value, std::make_unsigned, std::common_type>::type; #endif template using is_signed_int_t = std::enable_if_t::value>; template using is_unsigned_int_t = std::enable_if_t::value>; template using to_unsigned_t = typename to_unsigned::type; } // namespace internal } // namespace atcoder // line 12 "/home/seekworser/.cpp_lib/competitive_library/atcoder/modint.hpp" namespace atcoder { namespace internal { struct modint_base {}; struct static_modint_base : modint_base {}; template using is_modint = std::is_base_of; template using is_modint_t = std::enable_if_t::value>; } // namespace internal template * = nullptr> struct static_modint : internal::static_modint_base { using mint = static_modint; public: static constexpr int mod() { return m; } static mint raw(int v) { mint x; x._v = v; return x; } static_modint() : _v(0) {} template * = nullptr> static_modint(T v) { long long x = (long long)(v % (long long)(umod())); if (x < 0) x += umod(); _v = (unsigned int)(x); } template * = nullptr> static_modint(T v) { _v = (unsigned int)(v % umod()); } unsigned int val() const { return _v; } mint& operator++() { _v++; if (_v == umod()) _v = 0; return *this; } mint& operator--() { if (_v == 0) _v = umod(); _v--; return *this; } mint operator++(int) { mint result = *this; ++*this; return result; } mint operator--(int) { mint result = *this; --*this; return result; } mint& operator+=(const mint& rhs) { _v += rhs._v; if (_v >= umod()) _v -= umod(); return *this; } mint& operator-=(const mint& rhs) { _v -= rhs._v; if (_v >= umod()) _v += umod(); return *this; } mint& operator*=(const mint& rhs) { unsigned long long z = _v; z *= rhs._v; _v = (unsigned int)(z % umod()); return *this; } mint& operator/=(const mint& rhs) { return *this = *this * rhs.inv(); } mint& operator=(const mint& rhs) { (*this)._v = rhs.val(); return *this; } mint operator+() const { return *this; } mint operator-() const { return mint() - *this; } mint pow(long long n) const { assert(0 <= n); mint x = *this, r = 1; while (n) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; } mint inv() const { if (prime) { assert(_v); return pow(umod() - 2); } else { auto eg = internal::inv_gcd(_v, m); assert(eg.first == 1); return eg.second; } } friend mint operator+(const mint& lhs, const mint& rhs) { return mint(lhs) += rhs; } friend mint operator-(const mint& lhs, const mint& rhs) { return mint(lhs) -= rhs; } friend mint operator*(const mint& lhs, const mint& rhs) { return mint(lhs) *= rhs; } friend mint operator/(const mint& lhs, const mint& rhs) { return mint(lhs) /= rhs; } friend bool operator==(const mint& lhs, const mint& rhs) { return lhs._v == rhs._v; } friend bool operator!=(const mint& lhs, const mint& rhs) { return lhs._v != rhs._v; } private: unsigned int _v; static constexpr unsigned int umod() { return m; } static constexpr bool prime = internal::is_prime; }; template struct dynamic_modint : internal::modint_base { using mint = dynamic_modint; public: static int mod() { return (int)(bt.umod()); } static void set_mod(int m) { assert(1 <= m); bt = internal::barrett(m); } static mint raw(int v) { mint x; x._v = v; return x; } dynamic_modint() : _v(0) {} template * = nullptr> dynamic_modint(T v) { long long x = (long long)(v % (long long)(mod())); if (x < 0) x += mod(); _v = (unsigned int)(x); } template * = nullptr> dynamic_modint(T v) { _v = (unsigned int)(v % mod()); } unsigned int val() const { return _v; } mint& operator++() { _v++; if (_v == umod()) _v = 0; return *this; } mint& operator--() { if (_v == 0) _v = umod(); _v--; return *this; } mint operator++(int) { mint result = *this; ++*this; return result; } mint operator--(int) { mint result = *this; --*this; return result; } mint& operator+=(const mint& rhs) { _v += rhs._v; if (_v >= umod()) _v -= umod(); return *this; } mint& operator-=(const mint& rhs) { _v += mod() - rhs._v; if (_v >= umod()) _v -= umod(); return *this; } mint& operator*=(const mint& rhs) { _v = bt.mul(_v, rhs._v); return *this; } mint& operator/=(const mint& rhs) { return *this = *this * rhs.inv(); } mint& operator=(const mint& rhs) { (*this)._v = rhs.val(); return *this; } mint operator+() const { return *this; } mint operator-() const { return mint() - *this; } mint pow(long long n) const { assert(0 <= n); mint x = *this, r = 1; while (n) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; } mint inv() const { auto eg = internal::inv_gcd(_v, mod()); assert(eg.first == 1); return eg.second; } friend mint operator+(const mint& lhs, const mint& rhs) { return mint(lhs) += rhs; } friend mint operator-(const mint& lhs, const mint& rhs) { return mint(lhs) -= rhs; } friend mint operator*(const mint& lhs, const mint& rhs) { return mint(lhs) *= rhs; } friend mint operator/(const mint& lhs, const mint& rhs) { return mint(lhs) /= rhs; } friend bool operator==(const mint& lhs, const mint& rhs) { return lhs._v == rhs._v; } friend bool operator!=(const mint& lhs, const mint& rhs) { return lhs._v != rhs._v; } private: unsigned int _v; static internal::barrett bt; static unsigned int umod() { return bt.umod(); } }; template internal::barrett dynamic_modint::bt(998244353); using modint998244353 = static_modint<998244353>; using modint1000000007 = static_modint<1000000007>; using modint = dynamic_modint<-1>; namespace internal { template using is_static_modint = std::is_base_of; template using is_static_modint_t = std::enable_if_t::value>; template struct is_dynamic_modint : public std::false_type {}; template struct is_dynamic_modint> : public std::true_type {}; template using is_dynamic_modint_t = std::enable_if_t::value>; } // namespace internal } // namespace atcoder // line 4 "/home/seekworser/.cpp_lib/competitive_library/competitive/math/modint.hpp" namespace modint_internal { template Mint pow(Mint a, ll n) { Mint res = 1; while (n > 0) { if (n & 1) res *= a; if (n > 1) a *= a; n >>= 1; } return res; } template inline istream& input(istream& is, Mint& x) {ll a; is >> a; x = a; return is; } template inline ostream& print(ostream& os, const Mint& x) { os << x.val(); return os; } } inline istream& operator>>(istream& is, atcoder::modint& x) { return modint_internal::input(is, x); } template inline istream& operator>>(istream& is, atcoder::static_modint& x) { return modint_internal::input(is, x); } inline ostream& operator<<(ostream& os, const atcoder::modint& x) { return modint_internal::print(os, x); } template inline ostream& operator<<(ostream& os, const atcoder::static_modint& x) { return modint_internal::print(os, x); } atcoder::modint pow(atcoder::modint a, ll n) { return modint_internal::pow(a, n); } template atcoder::static_modint pow(atcoder::static_modint a, ll n) { return modint_internal::pow(a, n); } using modint998244353 = atcoder::modint998244353; using modint1000000007 = atcoder::modint1000000007; using modint = atcoder::modint; /** * @brief modint.hpp * @docs docs/math/modint.md */ // line 3 "/home/seekworser/.cpp_lib/competitive_library/competitive/std/io.hpp" // overload operators (prototypes) template inline istream& operator>>(istream& is, pair& p); template inline istream& operator>>(istream& is, vector& v); template inline ostream& operator<<(ostream& os, const pair& p); template inline ostream& operator<<(ostream& os, const vector& v); template ostream &operator<<(ostream &os, const map &mp); template ostream &operator<<(ostream &os, const set &st); template ostream &operator<<(ostream &os, const multiset &st); template ostream &operator<<(ostream &os, const unordered_set &st); template ostream &operator<<(ostream &os, queue q); template ostream &operator<<(ostream &os, deque q); template ostream &operator<<(ostream &os, stack st); template ostream &operator<<(ostream &os, priority_queue pq); // overload operators template inline istream& operator>>(istream& is, pair& p) { is >> p.first >> p.second; return is; } template inline istream& operator>>(istream& is, vector& v) { repe(x, v) is >> x; return is; } template inline ostream& operator<<(ostream& os, const pair& p) { os << p.first << " " << p.second; return os; } template inline ostream& operator<<(ostream& os, const vector& v) { rep(i, sz(v)) { os << v.at(i); if (i != sz(v) - 1) os << " "; } return os; } template ostream &operator<<(ostream &os, const map &mp) { for (auto &[key, val] : mp) { os << key << ":" << val << " "; } return os; } template ostream &operator<<(ostream &os, const set &st) { auto itr = st.begin(); for (int i = 0; i < (int)st.size(); i++) { os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; } template ostream &operator<<(ostream &os, const multiset &st) { auto itr = st.begin(); for (int i = 0; i < (int)st.size(); i++) { os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; } template ostream &operator<<(ostream &os, const unordered_set &st) { ll cnt = 0; for (auto &e : st) { os << e << (++cnt != (int)st.size() ? " " : ""); } return os; } template ostream &operator<<(ostream &os, queue q) { while (q.size()) { os << q.front() << " "; q.pop(); } return os; } template ostream &operator<<(ostream &os, deque q) { while (q.size()) { os << q.front() << " "; q.pop_front(); } return os; } template ostream &operator<<(ostream &os, stack st) { while (st.size()) { os << st.top() << " "; st.pop(); } return os; } template ostream &operator<<(ostream &os, priority_queue pq) { while (pq.size()) { os << pq.top() << " "; pq.pop(); } return os; } template int print_sep_end(string sep, string end, const T& val) { (void)sep; cout << val << end; return 0; }; template int print_sep_end(string sep, string end, const T1 &val, const T2 &...remain) { cout << val << sep; print_sep_end(sep, end, remain...); return 0; }; template int print(const T &...args) { print_sep_end(" ", "\n", args...); return 0; }; template void flush() { cout << flush; }; template int print_and_flush(const T &...args) { print(args...); flush(); return 0; }; #define debug(...) debug_func(0, #__VA_ARGS__, __VA_ARGS__) // debug print template void input(T &a) { cin >> a; }; template void input(T1&a, T2 &...b) { cin >> a; input(b...); }; #ifdef LOCAL_TEST template void debug_func(int i, const T name) { (void)i; (void)name; cerr << endl; } template void debug_func(int i, const T1 &name, const T2 &a, const T3 &...b) { int scope = 0; for ( ; (scope != 0 || name[i] != ',') && name[i] != '\0'; i++ ) { cerr << name[i]; if (name[i] == '(' || name[i] == '{') scope++; if (name[i] == ')' || name[i] == '}') scope--; } cerr << ":" << a << " "; debug_func(i + 1, name, b...); } template void debug_func(int i, const T1 &name, T2 &a, T3 &...b) { int scope = 0; for ( ; (scope != 0 || name[i] != ',') && name[i] != '\0'; i++ ) { cerr << name[i]; if (name[i] == '(' || name[i] == '{') scope++; if (name[i] == ')' || name[i] == '}') scope--; } cerr << ":" << a << " "; debug_func(i + 1, name, b...); } #endif #ifndef LOCAL_TEST template void debug_func(T &...) {} template void debug_func(const T &...) {} #endif /** * @brief io.hpp * @docs docs/std/io.md */ // line 5 "answer.cpp" template bool inner_solve(int n, vi &a, T xt) { using vt = vector; vt a_t; for (int i=0; i, vector>> checked; map, vt> checked; bool ans = false; auto solve = [&] (auto self, vt &ai) -> vt { if (ai.size() == 1) return {{T(ai[0])}}; vi an; rep(i, sz(ai)) an.push_back(ai[i].val()); sort(all(an)); if(checked.count(an)) return checked[an]; // debug(an); set seen; vt rev; for (int b=1; b<(1<> i) & 1) a1.push_back(ai[i]); else a2.push_back(ai[i]); } vt ans1 = self(self, a1); vt ans2 = self(self, a2); for (auto v1 : ans1) for (auto v2 : ans2) { if (!seen.count((v1 + v2).val())) { rev.emplace_back(v1+v2); // rev.emplace_back(v1+v2, s1 + "+" + s2); seen.emplace((v1 + v2).val()); } if (!seen.count((v1 - v2).val())) { rev.emplace_back(v1-v2); // rev.emplace_back(v1-v2, s1 + "-" + s2); seen.emplace((v1 - v2).val()); } if (!seen.count((v1 * v2).val())) { rev.emplace_back(v1*v2); // rev.emplace_back(v1*v2, "(" + s1 + ")*(" + s2 + ")"); seen.emplace((v1 * v2).val()); } if (v2 != T(0) && !seen.count((v1 / v2).val())) { // debug(v1, v2, v1 / v2); rev.emplace_back(v1/v2); // rev.emplace_back(v1/v2, "(" + s1 + ")/(" + s2 + ")"); seen.emplace((v1 / v2).val()); } if (a.size() == n && seen.count(xt.val())) { ans = true; break; } } if (a.size() == n && seen.count(xt.val())) break; } checked[an] = rev; // debug(an, rev); return rev; }; solve(solve, a_t); return ans; } template bool solve(int n, vi &a) { rep(i, n) { T xt = T(a[i]); vi an; rep(j, n) if (j != i) an.push_back(a[j]); bool rev = inner_solve(n-1, an, xt); if (rev) return rev; } return false; } int main() { int n; cin >> n; vector a(n); rep(i, n) cin >> a[i]; // debug(n, a); if (solve(n, a)) return YES(); // debug(n, a); if (solve(n, a)) return YES(); // using mint = modint; // mint::set_mod(99999959); // if (solve(n, a)) return YES(); // mint::set_mod(99999971); // if (solve(n, a)) return YES(); // mint::set_mod(99999989); // if (solve(n, a)) return YES(); return NO(); }