// TEMPLATE START #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef long double ld; typedef vector<int> vi; typedef vector<ll> vll; typedef vector<ull> vull; typedef vector<bool> vb; typedef vector<double> vd; typedef pair<int,int> pii; typedef vector<vi> vvi; typedef vector<pii> vpii; typedef vector<vpii> vvpii; const int MOD = 1000000007; const int INF = 2147483647; const ll LINF = 1e18; const ld PI = 4*atan((ld)1); #define rep(i,a,b) for (int i=(a); i<(b); ++i) #define repd(i,a,b) for (int i=((int)(a)); i>=(b); --i) #define trav(a,x) for (auto& a : x) #define all(u) begin(u), end(u) #define sz(x) (int)x.size() #define xsort(v, m) rep(i, 0, v.size()) m[i] = i; sort(all(m), [=](int i, int j) {return v[i] < v[j];}); sort(v); #define pb push_back #define X first #define Y second #define FAST_IO ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); #define PREC(n) cout<<fixed<<setprecision(n); #define db(x) cerr << __LINE__ << ": " << #x << " = " << (x) << endl; #define dbv(v) cerr << __LINE__ << ": " << #v << "\n" << v.size() << "\n" << v << "\n"; template <class T, class S> ostream& operator << (ostream& os, const pair<T, S>& p) { os << p.X << " " << p.Y; return os; } template <class T, class S> istream& operator >> (istream& is, pair<T, S>& p) { is >> p.X >> p.Y; return is; } template <class T> ostream& operator << (ostream& os, const vector<T>& v) { rep(i, 0, v.size()) os << v[i] << " \n" [i == v.size() - 1]; return os; } template <class T> istream& operator >> (istream& is, vector<T>& v) { rep(i, 0, v.size()) is >> v[i]; return is; } // TEMPLATE END // SOLUTION START vvi bins; bool areEqual(int r1, string& k1, int r2, string& k2) { rep(i, 0, k1.size()) if(k1[i] != k2[i]) return false; return true; } int madd(int x, int y) { return (x + y) % MOD; } int msub(int x, int y) { return (x + MOD - y) % MOD; } int mmul(int x, int y) { return ((long long)x * (long long)y) % (long long)MOD; } void swap(int& x, int& y) { int tmp = x; x = y; y = tmp; } int binomial(int n, int m) { return (n < m) ? 0 : bins[n + 1][m + 1]; } int in1(int r1, string& k1) { int r = 0, n = k1.size(); rep(i, 0, r1 + 1) { r = madd(r, binomial(n, i)); } return r; } int hamming2(string& k1, string& k2) { int d = 0; rep(i, 0, k1.size()) { if(k1[i] != k2[i]) d++; } return d; } int hamming3(string& k1, string& k2, string& k3, int& d1, int& d2, int& d3) { int d = 0; d1 = d2 = d3 = 0; rep(i, 0, k1.size()) { if(k1[i] == k2[i] && k1[i] != k3[i]) {d3++; d++;} else if(k1[i] == k3[i] && k2[i] != k1[i]) {d2++; d++;} else if(k2[i] == k3[i] && k2[i] != k1[i]) {d1++; d++;} } return d; } int in2(int r1, string& k1, int r2, string& k2) { int r = 0, tmp, n = k1.size(), d = hamming2(k1, k2); rep(i, max(d - r2, 0), min(r1, d) + 1) { tmp = 0; rep(j, 0, min(r1 - i, r2 - d + i) + 1) { tmp = madd(tmp, binomial(n - d, j)); } r = madd(r, mmul(binomial(d, i), tmp)); } return r; } void pref(vi& v, int n) { v[0] = bins[n + 1][1]; for (int i = 1; i <= n; i++) v[i] = madd(v[i - 1], bins[n + 1][i + 1]); } int in3(int r1, string& k1, int r2, string& k2, int r3, string& k3) { int d1, d2, d3, x1, x2, x3, m; int r = 0, tmp, ttmp, tttmp, n = sz(k1), d = hamming3(k1, k2, k3, d1, d2, d3); vi prefix(n - d + 1); pref(prefix, n - d); rep(i, max(0, d1 - min(r2, r3)), min(d1, r1) + 1) { x1 = d1 - i; // x1 <= r2 && x1 <= r3 tmp = binomial(d1, i); rep(j, max(0, d2 - min(r1 - i, r3 - x1)), min(d2, r2 - x1) + 1) { x2 = d2 - j; // x2 <= r1 - i && x2 <= r3 - x1 ttmp = binomial(d2, j); rep(k, max(max(x1 + d3 + j - r2, x2 + d3 + i - r1), 0), min(d3, r3 - x1 - x2) + 1) { x3 = d3 - k; m = min(min(min(r1 - (x2 + x3 + i), r2 - (x1 + x3 + j)), r3 - (x1 + x2 + k)), n - d); tttmp = binomial(d3, k); r = madd(r, mmul(tmp, mmul(ttmp, mmul(tttmp, prefix[m])))); } } } return r; } void init(vvi& bins, int n) { bins.pb(vi(1)); bins.pb(vi(2, 1)); rep(i, 2, n + 1) { bins.pb(vi(i + 1)); bins[i][1] = bins[i - 1][1]; rep(j, 2, i) { bins[i][j] = madd(bins[i - 1][j], bins[i - 1][j - 1]); } bins[i][i] = bins[i - 1][i - 1]; } } int main() { FAST_IO int n, r1, r2, r3, r = 0; cin >> n; init(bins, n + 1); string k1, k2, k3; cin >> r1 >> k1 >> r2 >> k2 >> r3 >> k3; bool eq = false; if(areEqual(r1, k1, r3, k3)) { if(r1 < r3) { swap(r1, r3); swap(k1, k3); } eq = true; } if(areEqual(r2, k2, r3, k3)) { if(r2 < r3) { swap(r2, r3); swap(k2, k3); } eq = true; } if(areEqual(r1, k1, r2, k2)) { if(r1 < r2) { swap(r1, r2); swap(k1, k2); } swap(r2, r3); swap(k2, k3); eq = true; } if(eq) { r = msub(madd(in1(r1, k1), in1(r1, k1)), in2(r1, k1, r2, k2)); } else { r = madd(r, madd(madd(in1(r1, k1), in1(r2, k2)), in1(r3, k3))); r = msub(msub(msub(r, in2(r1, k1, r2, k2)), in2(r1, k1, r3, k3)), in2(r2, k2, r3, k3)); r = madd(r, in3(r1, k1, r2, k2, r3, k3)); } cout << r << "\n"; return 0; } // SOLUTION END /* 6 3 000000 3 000001 2 000011 */
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 | // TEMPLATE START #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef long double ld; typedef vector<int> vi; typedef vector<ll> vll; typedef vector<ull> vull; typedef vector<bool> vb; typedef vector<double> vd; typedef pair<int,int> pii; typedef vector<vi> vvi; typedef vector<pii> vpii; typedef vector<vpii> vvpii; const int MOD = 1000000007; const int INF = 2147483647; const ll LINF = 1e18; const ld PI = 4*atan((ld)1); #define rep(i,a,b) for (int i=(a); i<(b); ++i) #define repd(i,a,b) for (int i=((int)(a)); i>=(b); --i) #define trav(a,x) for (auto& a : x) #define all(u) begin(u), end(u) #define sz(x) (int)x.size() #define xsort(v, m) rep(i, 0, v.size()) m[i] = i; sort(all(m), [=](int i, int j) {return v[i] < v[j];}); sort(v); #define pb push_back #define X first #define Y second #define FAST_IO ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); #define PREC(n) cout<<fixed<<setprecision(n); #define db(x) cerr << __LINE__ << ": " << #x << " = " << (x) << endl; #define dbv(v) cerr << __LINE__ << ": " << #v << "\n" << v.size() << "\n" << v << "\n"; template <class T, class S> ostream& operator << (ostream& os, const pair<T, S>& p) { os << p.X << " " << p.Y; return os; } template <class T, class S> istream& operator >> (istream& is, pair<T, S>& p) { is >> p.X >> p.Y; return is; } template <class T> ostream& operator << (ostream& os, const vector<T>& v) { rep(i, 0, v.size()) os << v[i] << " \n" [i == v.size() - 1]; return os; } template <class T> istream& operator >> (istream& is, vector<T>& v) { rep(i, 0, v.size()) is >> v[i]; return is; } // TEMPLATE END // SOLUTION START vvi bins; bool areEqual(int r1, string& k1, int r2, string& k2) { rep(i, 0, k1.size()) if(k1[i] != k2[i]) return false; return true; } int madd(int x, int y) { return (x + y) % MOD; } int msub(int x, int y) { return (x + MOD - y) % MOD; } int mmul(int x, int y) { return ((long long)x * (long long)y) % (long long)MOD; } void swap(int& x, int& y) { int tmp = x; x = y; y = tmp; } int binomial(int n, int m) { return (n < m) ? 0 : bins[n + 1][m + 1]; } int in1(int r1, string& k1) { int r = 0, n = k1.size(); rep(i, 0, r1 + 1) { r = madd(r, binomial(n, i)); } return r; } int hamming2(string& k1, string& k2) { int d = 0; rep(i, 0, k1.size()) { if(k1[i] != k2[i]) d++; } return d; } int hamming3(string& k1, string& k2, string& k3, int& d1, int& d2, int& d3) { int d = 0; d1 = d2 = d3 = 0; rep(i, 0, k1.size()) { if(k1[i] == k2[i] && k1[i] != k3[i]) {d3++; d++;} else if(k1[i] == k3[i] && k2[i] != k1[i]) {d2++; d++;} else if(k2[i] == k3[i] && k2[i] != k1[i]) {d1++; d++;} } return d; } int in2(int r1, string& k1, int r2, string& k2) { int r = 0, tmp, n = k1.size(), d = hamming2(k1, k2); rep(i, max(d - r2, 0), min(r1, d) + 1) { tmp = 0; rep(j, 0, min(r1 - i, r2 - d + i) + 1) { tmp = madd(tmp, binomial(n - d, j)); } r = madd(r, mmul(binomial(d, i), tmp)); } return r; } void pref(vi& v, int n) { v[0] = bins[n + 1][1]; for (int i = 1; i <= n; i++) v[i] = madd(v[i - 1], bins[n + 1][i + 1]); } int in3(int r1, string& k1, int r2, string& k2, int r3, string& k3) { int d1, d2, d3, x1, x2, x3, m; int r = 0, tmp, ttmp, tttmp, n = sz(k1), d = hamming3(k1, k2, k3, d1, d2, d3); vi prefix(n - d + 1); pref(prefix, n - d); rep(i, max(0, d1 - min(r2, r3)), min(d1, r1) + 1) { x1 = d1 - i; // x1 <= r2 && x1 <= r3 tmp = binomial(d1, i); rep(j, max(0, d2 - min(r1 - i, r3 - x1)), min(d2, r2 - x1) + 1) { x2 = d2 - j; // x2 <= r1 - i && x2 <= r3 - x1 ttmp = binomial(d2, j); rep(k, max(max(x1 + d3 + j - r2, x2 + d3 + i - r1), 0), min(d3, r3 - x1 - x2) + 1) { x3 = d3 - k; m = min(min(min(r1 - (x2 + x3 + i), r2 - (x1 + x3 + j)), r3 - (x1 + x2 + k)), n - d); tttmp = binomial(d3, k); r = madd(r, mmul(tmp, mmul(ttmp, mmul(tttmp, prefix[m])))); } } } return r; } void init(vvi& bins, int n) { bins.pb(vi(1)); bins.pb(vi(2, 1)); rep(i, 2, n + 1) { bins.pb(vi(i + 1)); bins[i][1] = bins[i - 1][1]; rep(j, 2, i) { bins[i][j] = madd(bins[i - 1][j], bins[i - 1][j - 1]); } bins[i][i] = bins[i - 1][i - 1]; } } int main() { FAST_IO int n, r1, r2, r3, r = 0; cin >> n; init(bins, n + 1); string k1, k2, k3; cin >> r1 >> k1 >> r2 >> k2 >> r3 >> k3; bool eq = false; if(areEqual(r1, k1, r3, k3)) { if(r1 < r3) { swap(r1, r3); swap(k1, k3); } eq = true; } if(areEqual(r2, k2, r3, k3)) { if(r2 < r3) { swap(r2, r3); swap(k2, k3); } eq = true; } if(areEqual(r1, k1, r2, k2)) { if(r1 < r2) { swap(r1, r2); swap(k1, k2); } swap(r2, r3); swap(k2, k3); eq = true; } if(eq) { r = msub(madd(in1(r1, k1), in1(r1, k1)), in2(r1, k1, r2, k2)); } else { r = madd(r, madd(madd(in1(r1, k1), in1(r2, k2)), in1(r3, k3))); r = msub(msub(msub(r, in2(r1, k1, r2, k2)), in2(r1, k1, r3, k3)), in2(r2, k2, r3, k3)); r = madd(r, in3(r1, k1, r2, k2, r3, k3)); } cout << r << "\n"; return 0; } // SOLUTION END /* 6 3 000000 3 000001 2 000011 */ |