// // 一般の可換環上の行列 (加法・乗法, 行列累乗, 行列式 (in O(N^4)) // Ring は「加法」「減法」「乗法」が定義されているクラス。コンストラクタで以下の情報を渡す。 //  ・ADD (加法), SUB (減法), MUL (乗法), ADD_IDENTITY (加法の単位元), MUL_IDENTITY (乗法の単位元) //  ・何もしなければ、通常の演算子「+」「-」「*」が呼び出される // 行列式を除算なしで O(N^4) で求める // // reference: // https://noshi91.hatenablog.com/entry/2020/11/28/115621 // // verified: // yukicoder No.1303 Inconvenient Kingdom // https://yukicoder.me/problems/no/1303 // #include using namespace std; // general semiring matrix (define ADD, SUB, MUL, ADD_IDENTITY, MUL_IDENTITY) template struct RingMatrix { using FuncOperator = function; // inner value int H, W; vector> val; // operators Ring ADD_IDENTITY, MUL_IDENTITY; FuncOperator ADD, SUB, MUL; // constructors RingMatrix() : H(0), W(0) , ADD_IDENTITY() , MUL_IDENTITY() , ADD([](Ring a, Ring b){ return a + b; }) , SUB([](Ring a, Ring b){ return a - b; }) , MUL([](Ring a, Ring b){ return a * b; }) {} RingMatrix(const RingMatrix &mat) : H(mat.H), W(mat.W), val(mat.val) , ADD(mat.ADD), SUB(mat.SUB), MUL(mat.MUL) , ADD_IDENTITY(mat.ADD_IDENTITY), MUL_IDENTITY(mat.MUL_IDENTITY) {} RingMatrix(int H, int W , const FuncOperator add, const FuncOperator sub, const FuncOperator mul , Ring add_identity, Ring mul_identity) { init(H, W, add, sub, mul, add_identity, mul_identity); } void init(int h, int w, const Ring &x) { H = h, W = w; val.assign(h, vector(w, x)); } void init(int h, int w , const FuncOperator add, const FuncOperator sub, const FuncOperator mul , const Ring &add_identity, const Ring &mul_identity) { H = h, W = w; ADD = add, SUB = sub, MUL = mul; ADD_IDENTITY = add_identity, MUL_IDENTITY = mul_identity; val.assign(h, vector(w, ADD_IDENTITY)); } void resize(int h, int w) { H = h, W = w; val.resize(h); for (int i = 0; i < h; ++i) val[i].resize(w); } // getter and debugger constexpr int height() const { return H; } constexpr int width() const { return W; } constexpr bool empty() const { return height() == 0; } vector& operator [] (int i) { return val[i]; } const vector& operator [] (int i) const { return val[i]; } friend constexpr ostream& operator << (ostream &os, const RingMatrix &mat) { for (int i = 0; i < mat.height(); ++i) { for (int j = 0; j < mat.width(); ++j) { if (j) os << ' '; os << mat.val[i][j]; } os << '\n'; } return os; } // comparison operators constexpr bool operator == (const RingMatrix &r) const { return this->val == r.val; } constexpr bool operator != (const RingMatrix &r) const { return this->val != r.val; } // arithmetic operators constexpr RingMatrix& operator += (const RingMatrix &r) { assert(height() == r.height()); assert(width() == r.width()); assert(ADD_IDENTITY == r.ADD_IDENTITY); assert(MUL_IDENTITY == r.MUL_IDENTITY); for (int i = 0; i < height(); ++i) for (int j = 0; j < width(); ++j) val[i][j] = ADD(val[i][j], r.val[i][j]); return *this; } constexpr RingMatrix& operator -= (const RingMatrix &r) { assert(height() == r.height()); assert(width() == r.width()); assert(ADD_IDENTITY == r.ADD_IDENTITY); assert(MUL_IDENTITY == r.MUL_IDENTITY); for (int i = 0; i < height(); ++i) for (int j = 0; j < width(); ++j) val[i][j] = SUB(val[i][j], r.val[i][j]); return *this; } constexpr RingMatrix& operator *= (const Ring &v) { for (int i = 0; i < height(); ++i) for (int j = 0; j < width(); ++j) val[i][j] = MUL(val[i][j], v); return *this; } constexpr RingMatrix& operator *= (const RingMatrix &r) { assert(width() == r.height()); assert(ADD_IDENTITY == r.ADD_IDENTITY); assert(MUL_IDENTITY == r.MUL_IDENTITY); RingMatrix res(height(), r.width(), ADD, SUB, MUL, ADD_IDENTITY, MUL_IDENTITY); for (int i = 0; i < height(); ++i) for (int j = 0; j < r.width(); ++j) for (int k = 0; k < width(); ++k) res[i][j] = ADD(res[i][j], MUL(val[i][k], r.val[k][j])); return (*this) = res; } constexpr RingMatrix operator + () const { return RingMatrix(*this); } constexpr RingMatrix operator + (const RingMatrix &r) const { return RingMatrix(*this) += r; } constexpr RingMatrix operator - () const { RingMatrix res(*this); for (int i = 0; i < height(); ++i) for (int j = 0; j < width(); ++j) res.val[i][j] = SUB(ADD_IDENTITY, res.val[i][j]); return res; } constexpr RingMatrix operator * (const Ring &v) const { return RingMatrix(*this) *= v; } constexpr RingMatrix operator * (const RingMatrix &r) const { return RingMatrix(*this) *= r; } constexpr vector operator * (const vector &v) const { assert(width() == v.size()); vector res(height(), ADD_IDENTITY); for (int i = 0; i < height(); i++) for (int j = 0; j < width(); j++) res[i] = ADD(res[i], MUL(val[i][j], v[j])); return res; } // transpose constexpr RingMatrix trans() const { RingMatrix res(height(), width(), ADD, SUB, MUL, ADD_IDENTITY, MUL_IDENTITY); for (int row = 0; row < width(); row++) for (int col = 0; col < height(); col++) res[row][col] = val[col][row]; return res; } friend constexpr RingMatrix trans(const RingMatrix &mat) { return mat.trans(); } // pow constexpr RingMatrix pow(long long n) const { assert(height() == width()); RingMatrix res(height(), width(), ADD, SUB, MUL, ADD_IDENTITY, MUL_IDENTITY); RingMatrix mul(*this); for (int row = 0; row < height(); ++row) res[row][row] = MUL_IDENTITY; while (n > 0) { if (n & 1) res = res * mul; mul = mul * mul; n >>= 1; } return res; } friend constexpr RingMatrix pow(const RingMatrix &mat, long long n) { return mat.pow(n); } // determinant (without division, O(N^4)) constexpr Ring det() const { assert(height() == width()); if (height() == 0) return MUL_IDENTITY; int N = height(); vector> dp(N + 1, vector(N + 1, ADD_IDENTITY)); for (int i = 0; i <= N; i++) dp[i][i] = MUL_IDENTITY; for (int step = 0; step < N; step++) { vector> nex(N + 1, vector(N + 1, ADD_IDENTITY)); for (int row = 0; row < N; row++) { for (int col = row; col < N; col++) { for (int col2 = row + 1; col2 < N; col2++) { nex[row][col2] = SUB(nex[row][col2], MUL(dp[row][col], (*this)[col][col2])); } Ring tmp = MUL(dp[row][col], (*this)[col][row]); for (int col2 = row + 1; col2 <= N; col2++) { nex[col2][col2] = ADD(nex[col2][col2], tmp); } } } swap(dp, nex); } return dp[N][N]; } friend constexpr Ring det(const RingMatrix &mat) { return mat.det(); } }; //------------------------------// // Examples //------------------------------// // yukicoder No.1303 Inconvenient Kingdom struct UnionFind { // core member vector par, nex; // constructor UnionFind() { } UnionFind(int N) : par(N, -1), nex(N) { init(N); } void init(int N) { par.assign(N, -1); nex.resize(N); for (int i = 0; i < N; ++i) nex[i] = i; } // core methods int root(int x) { if (par[x] < 0) return x; else return par[x] = root(par[x]); } bool same(int x, int y) { return root(x) == root(y); } bool merge(int x, int y, bool merge_technique = true) { x = root(x), y = root(y); if (x == y) return false; if (merge_technique) if (par[x] > par[y]) swap(x, y); // merge technique par[x] += par[y]; par[y] = x; swap(nex[x], nex[y]); return true; } int size(int x) { return -par[root(x)]; } // get group vector group(int x) { vector res({x}); while (nex[res.back()] != x) res.push_back(nex[res.back()]); return res; } vector> groups() { vector> member(par.size()); for (int v = 0; v < (int)par.size(); ++v) { member[root(v)].push_back(v); } vector> res; for (int v = 0; v < (int)par.size(); ++v) { if (!member[v].empty()) res.push_back(member[v]); } return res; } }; // mod inv template constexpr T_VAL mod_inv(T_VAL a, T_MOD m) { T_VAL b = m, u = 1, v = 0; while (b > 0) { T_VAL t = a / b; a -= t * b, swap(a, b); u -= t * v, swap(u, v); } u %= m; if (u < 0) u += m; return u; } // dynamic modint struct DynamicModint { using mint = DynamicModint; // static menber static int MOD; // inner value unsigned int val; // constructor DynamicModint() : val(0) { } template DynamicModint(T v) { long long tmp = (long long)(v % (long long)(get_umod())); if (tmp < 0) tmp += get_umod(); val = (unsigned int)(tmp); } template DynamicModint(T v) { val = (unsigned int)(v % get_umod()); } long long get() const { return val; } static int get_mod() { return MOD; } static unsigned int get_umod() { return MOD; } static void set_mod(int mod) { MOD = mod; } // arithmetic operators mint operator + () const { return mint(*this); } mint operator - () const { return mint() - mint(*this); } mint operator + (const mint &r) const { return mint(*this) += r; } mint operator - (const mint &r) const { return mint(*this) -= r; } mint operator * (const mint &r) const { return mint(*this) *= r; } mint operator / (const mint &r) const { return mint(*this) /= r; } mint& operator += (const mint &r) { val += r.val; if (val >= get_umod()) val -= get_umod(); return *this; } mint& operator -= (const mint &r) { val -= r.val; if (val >= get_umod()) val += get_umod(); return *this; } mint& operator *= (const mint &r) { unsigned long long tmp = val; tmp *= r.val; val = (unsigned int)(tmp % get_umod()); return *this; } mint& operator /= (const mint &r) { return *this = *this * r.inv(); } mint pow(long long n) const { assert(n >= 0); mint res(1), mul(*this); while (n) { if (n & 1) res *= mul; mul *= mul; n >>= 1; } return res; } mint inv() const { assert(val); return mod_inv((long long)(val), get_umod()); } // other operators bool operator == (const mint &r) const { return this->val == r.val; } bool operator != (const mint &r) const { return this->val != r.val; } bool operator < (const mint &r) const { return this->val < r.val; } bool operator > (const mint &r) const { return this->val > r.val; } bool operator <= (const mint &r) const { return this->val <= r.val; } bool operator >= (const mint &r) const { return this->val >= r.val; } mint& operator ++ () { ++val; if (val == get_umod()) val = 0; return *this; } mint& operator -- () { if (val == 0) val = get_umod(); --val; return *this; } mint operator ++ (int) { mint res = *this; ++*this; return res; } mint operator -- (int) { mint res = *this; --*this; return res; } friend istream& operator >> (istream &is, mint &x) { long long tmp = 1; is >> tmp; tmp = tmp % (long long)(get_umod()); if (tmp < 0) tmp += get_umod(); x.val = (unsigned int)(tmp); return is; } friend ostream& operator << (ostream &os, const mint &x) { return os << x.val; } friend mint pow(const mint &r, long long n) { return r.pow(n); } friend mint inv(const mint &r) { return r.inv(); } }; int DynamicModint::MOD; void yukicoder_1303_general_det() { using mint = DynamicModint; int N, M, u, v; cin >> N >> M; vector G(N, vector(N, 0)); vector degs(N, 0); UnionFind uf(N); for (int i = 0; i < M; i++) { cin >> u >> v, u--, v--; G[u][v]++, G[v][u]++, degs[u]++, degs[v]++; uf.merge(u, v); } auto calc = [&](const vector &group) -> mint { auto add = [&](mint a, mint b) -> mint { return a + b; }; auto sub = [&](mint a, mint b) -> mint { return a - b; }; auto mul = [&](mint a, mint b) -> mint { return a * b; }; vector conv(N, -1); int iter = 0; for (auto v : group) conv[v] = iter++; RingMatrix L(iter, iter, add, sub, mul, 0, 1); for (int i = 0; i < iter; i++) L[i][i] = 1; for (auto v1 : group) { int i = conv[v1]; int deg = 0; for (auto v2 : group) { if (G[v1][v2]) deg += G[v1][v2]; int j = conv[v2]; if (i < iter - 1 && j < iter - 1) L[i][j] = -G[v1][v2]; } if (i < iter - 1) L[i][i] = deg; } return det(L); }; auto groups = uf.groups(); if (groups.size() > 1) { mint res = 1; vector siz; for (auto group : groups) siz.push_back(group.size()), res *= calc(group); sort(siz.begin(), siz.end(), greater()); long long sum = siz[0] + siz[1], sum2 = sum * sum; for (int i = 2; i < (int)siz.size(); i++) sum += siz[i], sum2 += siz[i] * siz[i]; long long huben = (sum * sum - sum2); if (siz[0] == siz[1]) { long long sumsiz = 0, sumsiz2 = 0; for (auto s : siz) if (s == siz[0]) sumsiz += s, sumsiz2 += s * s; long long fac = (sumsiz * sumsiz - sumsiz2) / 2; res *= fac; } else { long long sum_sub = 0; for (auto s : siz) if (s == siz[1]) sum_sub += s; long long fac = siz[0] * sum_sub; res *= fac; } cout << huben << endl << res << endl; } else { using Node = pair; auto add = [&](Node a, Node b) -> Node { return Node(a.first + b.first, a.second + b.second); }; auto sub = [&](Node a, Node b) -> Node { return Node(a.first - b.first, a.second - b.second); }; auto mul = [&](Node a, Node b) -> Node { return Node(a.first * b.first, a.first * b.second + a.second * b.first); }; long long huben = 0; Node zero(0, 0), one(1, 0); RingMatrix L(N, N, add, sub, mul, zero, one); for (int i = 0; i < N; i++) L[i][i] = one; for (int i = 0; i < N-1; i++) { L[i][i] = Node(mint(degs[i]), mint(N - 1 - degs[i])); for (int j = 0; j < N-1; j++) { if (i == j) continue; if (G[i][j]) L[i][j] = Node(mint(-G[i][j]), 0); else L[i][j] = Node(0, mint(-1)); } } Node f = det(L); mint res = f.first + f.second; cout << huben << endl << res << endl; } } int main() { yukicoder_1303_general_det(); }