#include <bits/stdc++.h> using namespace std; #include <array> template <typename T, int NDIMS> struct tensor_view { static_assert(NDIMS >= 0, "NDIMS must be nonnegative"); protected: std::array<int, NDIMS> shape; std::array<int, NDIMS> strides; T* data; tensor_view(std::array<int, NDIMS> shape_, std::array<int, NDIMS> strides_, T* data_) : shape(shape_), strides(strides_), data(data_) {} public: tensor_view() : shape{0}, strides{0}, data(nullptr) {} protected: int flatten_index(std::array<int, NDIMS> idx) const { int res = 0; for (int i = 0; i < NDIMS; i++) { res += idx[i] * strides[i]; } return res; } int flatten_index_checked(std::array<int, NDIMS> idx) const { int res = 0; for (int i = 0; i < NDIMS; i++) { assert(0 <= idx[i] && idx[i] < shape[i]); res += idx[i] * strides[i]; } return res; } public: T& operator[] (std::array<int, NDIMS> idx) const { #ifdef _GLIBCXX_DEBUG return data[flatten_index_checked(idx)]; #else return data[flatten_index(idx)]; #endif } T& at(std::array<int, NDIMS> idx) const { return data[flatten_index_checked(idx)]; } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type operator[] (int idx) const { std::array<int, NDIMS-1> nshape; std::copy(shape.begin()+1, shape.end(), nshape.begin()); std::array<int, NDIMS-1> nstrides; std::copy(strides.begin()+1, strides.end(), nstrides.begin()); T* ndata = data + (strides[0] * idx); return tensor_view<T, NDIMS-1>(nshape, nstrides, ndata); } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type at(int idx) const { assert(0 <= idx && idx < shape[0]); return operator[](idx); } template <int D = NDIMS> typename std::enable_if<(0 == D), T&>::type operator * () const { return *data; } template <typename U, int D> friend struct tensor_view; template <typename U, int D> friend struct tensor; }; template <typename T, int NDIMS> struct tensor { static_assert(NDIMS >= 0, "NDIMS must be nonnegative"); protected: std::array<int, NDIMS> shape; std::array<int, NDIMS> strides; int len; T* data; public: tensor() : shape{0}, strides{0}, len(0), data(nullptr) {} explicit tensor(std::array<int, NDIMS> shape_, const T& t = T()) { shape = shape_; len = 1; for (int i = NDIMS-1; i >= 0; i--) { strides[i] = len; len *= shape[i]; } data = new T[len]; std::fill(data, data + len, t); } tensor(const tensor& o) : shape(o.shape), strides(o.strides), len(o.len), data(new T[len]) { for (int i = 0; i < len; i++) { data[i] = o.data[i]; } } tensor& operator=(tensor&& o) noexcept { using std::swap; swap(shape, o.shape); swap(strides, o.strides); swap(len, o.len); swap(data, o.data); return *this; } tensor(tensor&& o) : tensor() { *this = std::move(o); } tensor& operator=(const tensor& o) { return *this = tensor(o); } ~tensor() { delete[] data; } using view_t = tensor_view<T, NDIMS>; view_t view() { return tensor_view<T, NDIMS>(shape, strides, data); } operator view_t() { return view(); } using const_view_t = tensor_view<const T, NDIMS>; const_view_t view() const { return tensor_view<const T, NDIMS>(shape, strides, data); } operator const_view_t() const { return view(); } T& operator[] (std::array<int, NDIMS> idx) { return view()[idx]; } T& at(std::array<int, NDIMS> idx) { return view().at(idx); } const T& operator[] (std::array<int, NDIMS> idx) const { return view()[idx]; } const T& at(std::array<int, NDIMS> idx) const { return view().at(idx); } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type operator[] (int idx) { return view()[idx]; } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type at(int idx) { return view().at(idx); } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<const T, NDIMS-1>>::type operator[] (int idx) const { return view()[idx]; } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<const T, NDIMS-1>>::type at(int idx) const { return view().at(idx); } template <int D = NDIMS> typename std::enable_if<(0 == D), T&>::type operator * () { return *view(); } template <int D = NDIMS> typename std::enable_if<(0 == D), const T&>::type operator * () const { return *view(); } }; template <int MOD_> struct modnum { static constexpr int MOD = MOD_; static_assert(MOD_ > 0, "MOD must be positive"); private: using ll = long long; int v; static int minv(int a, int m) { a %= m; assert(a); return a == 1 ? 1 : int(m - ll(minv(m, a)) * ll(m) / a); } public: modnum() : v(0) {} modnum(ll v_) : v(int(v_ % MOD)) { if (v < 0) v += MOD; } explicit operator int() const { return v; } friend std::ostream& operator << (std::ostream& out, const modnum& n) { return out << int(n); } friend std::istream& operator >> (std::istream& in, modnum& n) { ll v_; in >> v_; n = modnum(v_); return in; } friend bool operator == (const modnum& a, const modnum& b) { return a.v == b.v; } friend bool operator != (const modnum& a, const modnum& b) { return a.v != b.v; } modnum inv() const { modnum res; res.v = minv(v, MOD); return res; } friend modnum inv(const modnum& m) { return m.inv(); } modnum neg() const { modnum res; res.v = v ? MOD-v : 0; return res; } friend modnum neg(const modnum& m) { return m.neg(); } modnum operator- () const { return neg(); } modnum operator+ () const { return modnum(*this); } modnum& operator ++ () { v ++; if (v == MOD) v = 0; return *this; } modnum& operator -- () { if (v == 0) v = MOD; v --; return *this; } modnum& operator += (const modnum& o) { v += o.v; if (v >= MOD) v -= MOD; return *this; } modnum& operator -= (const modnum& o) { v -= o.v; if (v < 0) v += MOD; return *this; } modnum& operator *= (const modnum& o) { v = int(ll(v) * ll(o.v) % MOD); return *this; } modnum& operator /= (const modnum& o) { return *this *= o.inv(); } friend modnum operator ++ (modnum& a, int) { modnum r = a; ++a; return r; } friend modnum operator -- (modnum& a, int) { modnum r = a; --a; return r; } friend modnum operator + (const modnum& a, const modnum& b) { return modnum(a) += b; } friend modnum operator - (const modnum& a, const modnum& b) { return modnum(a) -= b; } friend modnum operator * (const modnum& a, const modnum& b) { return modnum(a) *= b; } friend modnum operator / (const modnum& a, const modnum& b) { return modnum(a) /= b; } }; template <typename T> T pow(T a, long long b) { assert(b >= 0); T r = 1; while (b) { if (b & 1) r *= a; b >>= 1; a *= a; } return r; } using num = modnum<int(1e9)+7>; vector<num> fact, ifact; void init(){ int N = 1100000; fact.resize(N); fact[0] = 1; for(int i = 1; i < N; i++) fact[i] = i * fact[i-1]; ifact.resize(N); ifact.back() = 1 / fact.back(); for(int i = N - 1; i > 0; i--) ifact[i-1] = i * ifact[i]; } num ncr(int n, int k){ if(k < 0 || k > n) return 0; return fact[n] * ifact[k] * ifact[n-k]; } int main(){ ios_base::sync_with_stdio(false), cin.tie(nullptr); init(); int N, M, K; cin >> N >> M >> K; vector<string> S(K); for(string& s : S){ cin >> s; for(char& c : s){ if(c == 'N') c = '+'; if(c == 'C') c = '-'; } } vector<int> decimal_place(K); int extra_overall_sum = 0; auto get_sgn = [&](char c) { return c == '+' ? 1 : -1; }; vector<int> extra_sums(M+1); for(int i = 0; i < K; i++){ int j = 0; while(j < M && S[i][j] == S[i][0]) j++; extra_overall_sum += (2 * j - (j < M)) * get_sgn(S[i][0]); for(int k = 1; k < M-j; k++){ extra_sums[k+1] += get_sgn(S[i][j+k]); } } int D1 = N * (2*M); // overall_sum abs <= N * (2*M) // active <= N-K int D3 = 2 * N + 1; // new_sum abs <= 2 * N + 1 // M = pile size // d in [K .. N] stacks using dp_t = tensor<num, 3>; dp_t dp({2*D1+1, N-K+1, 2*D3+1}, 0); dp_t tmp({2*D1+1, N-K+1, 2*D3+1}); dp[{extra_overall_sum + D1, 0, D3}] = 1; for(int place = M-1; place >= 1; place--){ // process +1/2^k for place+1 { tmp = dp_t({2*D1+1, N-K+1, 2*D3+1}, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; for(int d = 0; d <= active; d++){ int new_sum = small_sum + d - (active - d) + extra_sums[place+1]; if(new_sum % 2 == 0) tmp[{overall_sum + D1, active, new_sum / 2 + D3}] += freq * ncr(active, d); } } dp = tmp; } // add in things with place decimal points // small_sum is over 1/2^place for(int sgn : {-1, 1}){ int del = sgn * (2*(M - place) - 1); tmp = dp_t({2*D1+1, N-K+1, 2*D3+1}, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; for(int cnt = 0; cnt + active <= N-K; cnt++){ tmp[{overall_sum + del * cnt + D1, active + cnt, small_sum + D3}] += freq * ncr(active + cnt, cnt); } } dp = tmp; } // at the end: fraction over 1/2^place } for(int sgn : {-1, 1}){ int del = sgn * 2 * M; tmp = dp_t({2*D1+1, N-K+1, 2*D3+1}, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; for(int cnt = 0; cnt + active <= N-K; cnt++){ tmp[{overall_sum + del * cnt + D1, active + cnt, small_sum + D3}] += freq * ncr(active + cnt, cnt); } } dp = tmp; } vector<num> ans(N-K+1, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; if(overall_sum + small_sum == 0){ ans[active] += freq; } } for(int i = K; i <= N; i++){ cout << ans[i-K] << " \n"[i == N]; } }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 | #include <bits/stdc++.h> using namespace std; #include <array> template <typename T, int NDIMS> struct tensor_view { static_assert(NDIMS >= 0, "NDIMS must be nonnegative"); protected: std::array<int, NDIMS> shape; std::array<int, NDIMS> strides; T* data; tensor_view(std::array<int, NDIMS> shape_, std::array<int, NDIMS> strides_, T* data_) : shape(shape_), strides(strides_), data(data_) {} public: tensor_view() : shape{0}, strides{0}, data(nullptr) {} protected: int flatten_index(std::array<int, NDIMS> idx) const { int res = 0; for (int i = 0; i < NDIMS; i++) { res += idx[i] * strides[i]; } return res; } int flatten_index_checked(std::array<int, NDIMS> idx) const { int res = 0; for (int i = 0; i < NDIMS; i++) { assert(0 <= idx[i] && idx[i] < shape[i]); res += idx[i] * strides[i]; } return res; } public: T& operator[] (std::array<int, NDIMS> idx) const { #ifdef _GLIBCXX_DEBUG return data[flatten_index_checked(idx)]; #else return data[flatten_index(idx)]; #endif } T& at(std::array<int, NDIMS> idx) const { return data[flatten_index_checked(idx)]; } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type operator[] (int idx) const { std::array<int, NDIMS-1> nshape; std::copy(shape.begin()+1, shape.end(), nshape.begin()); std::array<int, NDIMS-1> nstrides; std::copy(strides.begin()+1, strides.end(), nstrides.begin()); T* ndata = data + (strides[0] * idx); return tensor_view<T, NDIMS-1>(nshape, nstrides, ndata); } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type at(int idx) const { assert(0 <= idx && idx < shape[0]); return operator[](idx); } template <int D = NDIMS> typename std::enable_if<(0 == D), T&>::type operator * () const { return *data; } template <typename U, int D> friend struct tensor_view; template <typename U, int D> friend struct tensor; }; template <typename T, int NDIMS> struct tensor { static_assert(NDIMS >= 0, "NDIMS must be nonnegative"); protected: std::array<int, NDIMS> shape; std::array<int, NDIMS> strides; int len; T* data; public: tensor() : shape{0}, strides{0}, len(0), data(nullptr) {} explicit tensor(std::array<int, NDIMS> shape_, const T& t = T()) { shape = shape_; len = 1; for (int i = NDIMS-1; i >= 0; i--) { strides[i] = len; len *= shape[i]; } data = new T[len]; std::fill(data, data + len, t); } tensor(const tensor& o) : shape(o.shape), strides(o.strides), len(o.len), data(new T[len]) { for (int i = 0; i < len; i++) { data[i] = o.data[i]; } } tensor& operator=(tensor&& o) noexcept { using std::swap; swap(shape, o.shape); swap(strides, o.strides); swap(len, o.len); swap(data, o.data); return *this; } tensor(tensor&& o) : tensor() { *this = std::move(o); } tensor& operator=(const tensor& o) { return *this = tensor(o); } ~tensor() { delete[] data; } using view_t = tensor_view<T, NDIMS>; view_t view() { return tensor_view<T, NDIMS>(shape, strides, data); } operator view_t() { return view(); } using const_view_t = tensor_view<const T, NDIMS>; const_view_t view() const { return tensor_view<const T, NDIMS>(shape, strides, data); } operator const_view_t() const { return view(); } T& operator[] (std::array<int, NDIMS> idx) { return view()[idx]; } T& at(std::array<int, NDIMS> idx) { return view().at(idx); } const T& operator[] (std::array<int, NDIMS> idx) const { return view()[idx]; } const T& at(std::array<int, NDIMS> idx) const { return view().at(idx); } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type operator[] (int idx) { return view()[idx]; } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<T, NDIMS-1>>::type at(int idx) { return view().at(idx); } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<const T, NDIMS-1>>::type operator[] (int idx) const { return view()[idx]; } template <int D = NDIMS> typename std::enable_if<(0 < D), tensor_view<const T, NDIMS-1>>::type at(int idx) const { return view().at(idx); } template <int D = NDIMS> typename std::enable_if<(0 == D), T&>::type operator * () { return *view(); } template <int D = NDIMS> typename std::enable_if<(0 == D), const T&>::type operator * () const { return *view(); } }; template <int MOD_> struct modnum { static constexpr int MOD = MOD_; static_assert(MOD_ > 0, "MOD must be positive"); private: using ll = long long; int v; static int minv(int a, int m) { a %= m; assert(a); return a == 1 ? 1 : int(m - ll(minv(m, a)) * ll(m) / a); } public: modnum() : v(0) {} modnum(ll v_) : v(int(v_ % MOD)) { if (v < 0) v += MOD; } explicit operator int() const { return v; } friend std::ostream& operator << (std::ostream& out, const modnum& n) { return out << int(n); } friend std::istream& operator >> (std::istream& in, modnum& n) { ll v_; in >> v_; n = modnum(v_); return in; } friend bool operator == (const modnum& a, const modnum& b) { return a.v == b.v; } friend bool operator != (const modnum& a, const modnum& b) { return a.v != b.v; } modnum inv() const { modnum res; res.v = minv(v, MOD); return res; } friend modnum inv(const modnum& m) { return m.inv(); } modnum neg() const { modnum res; res.v = v ? MOD-v : 0; return res; } friend modnum neg(const modnum& m) { return m.neg(); } modnum operator- () const { return neg(); } modnum operator+ () const { return modnum(*this); } modnum& operator ++ () { v ++; if (v == MOD) v = 0; return *this; } modnum& operator -- () { if (v == 0) v = MOD; v --; return *this; } modnum& operator += (const modnum& o) { v += o.v; if (v >= MOD) v -= MOD; return *this; } modnum& operator -= (const modnum& o) { v -= o.v; if (v < 0) v += MOD; return *this; } modnum& operator *= (const modnum& o) { v = int(ll(v) * ll(o.v) % MOD); return *this; } modnum& operator /= (const modnum& o) { return *this *= o.inv(); } friend modnum operator ++ (modnum& a, int) { modnum r = a; ++a; return r; } friend modnum operator -- (modnum& a, int) { modnum r = a; --a; return r; } friend modnum operator + (const modnum& a, const modnum& b) { return modnum(a) += b; } friend modnum operator - (const modnum& a, const modnum& b) { return modnum(a) -= b; } friend modnum operator * (const modnum& a, const modnum& b) { return modnum(a) *= b; } friend modnum operator / (const modnum& a, const modnum& b) { return modnum(a) /= b; } }; template <typename T> T pow(T a, long long b) { assert(b >= 0); T r = 1; while (b) { if (b & 1) r *= a; b >>= 1; a *= a; } return r; } using num = modnum<int(1e9)+7>; vector<num> fact, ifact; void init(){ int N = 1100000; fact.resize(N); fact[0] = 1; for(int i = 1; i < N; i++) fact[i] = i * fact[i-1]; ifact.resize(N); ifact.back() = 1 / fact.back(); for(int i = N - 1; i > 0; i--) ifact[i-1] = i * ifact[i]; } num ncr(int n, int k){ if(k < 0 || k > n) return 0; return fact[n] * ifact[k] * ifact[n-k]; } int main(){ ios_base::sync_with_stdio(false), cin.tie(nullptr); init(); int N, M, K; cin >> N >> M >> K; vector<string> S(K); for(string& s : S){ cin >> s; for(char& c : s){ if(c == 'N') c = '+'; if(c == 'C') c = '-'; } } vector<int> decimal_place(K); int extra_overall_sum = 0; auto get_sgn = [&](char c) { return c == '+' ? 1 : -1; }; vector<int> extra_sums(M+1); for(int i = 0; i < K; i++){ int j = 0; while(j < M && S[i][j] == S[i][0]) j++; extra_overall_sum += (2 * j - (j < M)) * get_sgn(S[i][0]); for(int k = 1; k < M-j; k++){ extra_sums[k+1] += get_sgn(S[i][j+k]); } } int D1 = N * (2*M); // overall_sum abs <= N * (2*M) // active <= N-K int D3 = 2 * N + 1; // new_sum abs <= 2 * N + 1 // M = pile size // d in [K .. N] stacks using dp_t = tensor<num, 3>; dp_t dp({2*D1+1, N-K+1, 2*D3+1}, 0); dp_t tmp({2*D1+1, N-K+1, 2*D3+1}); dp[{extra_overall_sum + D1, 0, D3}] = 1; for(int place = M-1; place >= 1; place--){ // process +1/2^k for place+1 { tmp = dp_t({2*D1+1, N-K+1, 2*D3+1}, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; for(int d = 0; d <= active; d++){ int new_sum = small_sum + d - (active - d) + extra_sums[place+1]; if(new_sum % 2 == 0) tmp[{overall_sum + D1, active, new_sum / 2 + D3}] += freq * ncr(active, d); } } dp = tmp; } // add in things with place decimal points // small_sum is over 1/2^place for(int sgn : {-1, 1}){ int del = sgn * (2*(M - place) - 1); tmp = dp_t({2*D1+1, N-K+1, 2*D3+1}, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; for(int cnt = 0; cnt + active <= N-K; cnt++){ tmp[{overall_sum + del * cnt + D1, active + cnt, small_sum + D3}] += freq * ncr(active + cnt, cnt); } } dp = tmp; } // at the end: fraction over 1/2^place } for(int sgn : {-1, 1}){ int del = sgn * 2 * M; tmp = dp_t({2*D1+1, N-K+1, 2*D3+1}, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; for(int cnt = 0; cnt + active <= N-K; cnt++){ tmp[{overall_sum + del * cnt + D1, active + cnt, small_sum + D3}] += freq * ncr(active + cnt, cnt); } } dp = tmp; } vector<num> ans(N-K+1, 0); for(int x = 0; x <= 2*D1; x++) for(int y = 0; y <= N-K; y++) for(int z = 0; z <= 2*D3; z++){ if(dp[{x, y, z}] == 0) continue; int overall_sum = x - D1; int active = y; int small_sum = z - D3; num freq = dp[{x, y, z}]; if(overall_sum + small_sum == 0){ ans[active] += freq; } } for(int i = K; i <= N; i++){ cout << ans[i-K] << " \n"[i == N]; } } |