#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using Int = long long; template ostream &operator<<(ostream &os, const vector &as); template ostream &operator<<(ostream &os, const pair &a) { return os << "(" << a.first << ", " << a.second << ")"; }; template ostream &operator<<(ostream &os, const vector &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; } template void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; } template bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; } template bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; } #define COLOR(s) ("\x1b[" s "m") //////////////////////////////////////////////////////////////////////////////// template struct ModInt { static constexpr unsigned M = M_; unsigned x; constexpr ModInt() : x(0U) {} constexpr ModInt(unsigned x_) : x(x_ % M) {} constexpr ModInt(unsigned long long x_) : x(x_ % M) {} constexpr ModInt(int x_) : x(((x_ %= static_cast(M)) < 0) ? (x_ + static_cast(M)) : x_) {} constexpr ModInt(long long x_) : x(((x_ %= static_cast(M)) < 0) ? (x_ + static_cast(M)) : x_) {} ModInt &operator+=(const ModInt &a) { x = ((x += a.x) >= M) ? (x - M) : x; return *this; } ModInt &operator-=(const ModInt &a) { x = ((x -= a.x) >= M) ? (x + M) : x; return *this; } ModInt &operator*=(const ModInt &a) { x = (static_cast(x) * a.x) % M; return *this; } ModInt &operator/=(const ModInt &a) { return (*this *= a.inv()); } ModInt pow(long long e) const { if (e < 0) return inv().pow(-e); ModInt a = *this, b = 1U; for (; e; e >>= 1) { if (e & 1) b *= a; a *= a; } return b; } ModInt inv() const { unsigned a = M, b = x; int y = 0, z = 1; for (; b; ) { const unsigned q = a / b; const unsigned c = a - q * b; a = b; b = c; const int w = y - static_cast(q) * z; y = z; z = w; } assert(a == 1U); return ModInt(y); } ModInt operator+() const { return *this; } ModInt operator-() const { ModInt a; a.x = x ? (M - x) : 0U; return a; } ModInt operator+(const ModInt &a) const { return (ModInt(*this) += a); } ModInt operator-(const ModInt &a) const { return (ModInt(*this) -= a); } ModInt operator*(const ModInt &a) const { return (ModInt(*this) *= a); } ModInt operator/(const ModInt &a) const { return (ModInt(*this) /= a); } template friend ModInt operator+(T a, const ModInt &b) { return (ModInt(a) += b); } template friend ModInt operator-(T a, const ModInt &b) { return (ModInt(a) -= b); } template friend ModInt operator*(T a, const ModInt &b) { return (ModInt(a) *= b); } template friend ModInt operator/(T a, const ModInt &b) { return (ModInt(a) /= b); } explicit operator bool() const { return x; } bool operator==(const ModInt &a) const { return (x == a.x); } bool operator!=(const ModInt &a) const { return (x != a.x); } friend std::ostream &operator<<(std::ostream &os, const ModInt &a) { return os << a.x; } }; //////////////////////////////////////////////////////////////////////////////// constexpr unsigned MO = 998244353; using Mint = ModInt; constexpr int LIM_INV = 2'000'010; Mint inv[LIM_INV], fac[LIM_INV], invFac[LIM_INV]; void prepare() { inv[1] = 1; for (int i = 2; i < LIM_INV; ++i) { inv[i] = -((Mint::M / i) * inv[Mint::M % i]); } fac[0] = invFac[0] = 1; for (int i = 1; i < LIM_INV; ++i) { fac[i] = fac[i - 1] * i; invFac[i] = invFac[i - 1] * inv[i]; } } Mint binom(Int n, Int k) { if (n < 0) { if (k >= 0) { return ((k & 1) ? -1 : +1) * binom(-n + k - 1, k); } else if (n - k >= 0) { return (((n - k) & 1) ? -1 : +1) * binom(-k - 1, n - k); } else { return 0; } } else { if (0 <= k && k <= n) { assert(n < LIM_INV); return fac[n] * invFac[k] * invFac[n - k]; } else { return 0; } } } //////////////////////////////////////////////////////////////////////////////// // [l, r)^n template void doArraysRec(int n, int l, int r, F f, int i, vector &as) { if (i == n) { f(as); } else { for (as[i] = l; as[i] < r; ++as[i]) doArraysRec(n, l, r, f, i + 1, as); } } template void doArrays(int n, int l, int r, F f) { vector as(n); doArraysRec(n, l, r, f, 0, as); } namespace brute { int N; vector> graph; void ae(int u, int v) { graph[u].push_back(v); graph[v].push_back(u); } int zeit; vector dis, fin, us; void dfs(int u, int p) { dis[u] = zeit++; us.push_back(u); for (const int v : graph[u]) if (p != v) { dfs(v, u); us.push_back(u); } fin[u] = zeit; } vector run(int N_) { N = N_; if (N == 1) return {0}; vector ans(N, 0), tateR0(N, 0), tateR1(N, 0), tate0(N, 0), tate1(N, 0), yoko(N, 0); doArrays(N - 2, 0, N, [&](const vector &as) -> void { vector deg(N, 1); for (int i = 0; i < N - 2; ++i) ++deg[as[i]]; graph.assign(N, {}); for (int i = 0; i < N - 2; ++i) { const int u = find(deg.begin(), deg.end(), 1) - deg.begin(); const int v = as[i]; --deg[u]; --deg[v]; ae(u, v); } { const int u = find(deg.begin(), deg.end(), 1) - deg.begin(); --deg[u]; const int v = find(deg.begin(), deg.end(), 1) - deg.begin(); --deg[v]; ae(u, v); } for (int u = 0; u < N; ++u) sort(graph[u].begin(), graph[u].end()); for (int r = 0; r < N; ++r) { zeit = 0; dis.assign(N, -1); fin.assign(N, -1); us.clear(); dfs(r, -1); for (int i = 0; i < (int)us.size(); ++i) for (int j = i + 1; j < (int)us.size(); ++j) if (us[i] > us[j]) { // u > v const int u = us[i]; const int v = us[j]; ++ans[r]; if (r == u) { ++tateR0[r]; } else if (r == v) { ++tateR1[r]; } else if (dis[u] <= dis[v] && dis[v] < fin[u]) { ++tate0[r]; } else if (dis[v] <= dis[u] && dis[u] < fin[v]) { ++tate1[r]; } else { ++yoko[r]; } } } }); cerr<<"[brute] N = "<