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  • 【BM模板】

    #include<bits/stdc++.h>
    #define mp make_pair
    #define rep(i,a,n) for (int i=a;i<n;i++)
    #define per(i,a,n) for (int i=n-1;i>=a;i--)
    #define pb push_back
    #define mp make_pair
    #define all(x) (x).begin(),(x).end()
    #define fi first
    #define se second
    #define SZ(x) ((int)(x).size())
    using namespace std;
    typedef vector<int> VI;
    typedef long long ll;
    typedef pair<int, int> PII;
    const ll mod = 1000000007;
    ll powmod(ll a, ll b) { ll res = 1; a %= mod; assert(b >= 0); for (; b; b >>= 1) { if (b & 1)res = res * a%mod; a = a * a%mod; }return res; }
    // head
    ll n;
    namespace linear_seq {
        const int N = 10010;
        ll res[N], base[N], _c[N], _md[N];
    
        vector<int> Md;
        void mul(ll *a, ll *b, int k) {
            rep(i, 0, k + k) _c[i] = 0;
            rep(i, 0, k) if (a[i]) rep(j, 0, k) _c[i + j] = (_c[i + j] + a[i] * b[j]) % mod;
            for (int i = k + k - 1; i >= k; i--) if (_c[i])
                rep(j, 0, SZ(Md)) _c[i - k + Md[j]] = (_c[i - k + Md[j]] - _c[i] * _md[Md[j]]) % mod;
            rep(i, 0, k) a[i] = _c[i];
        }
        int solve(ll n, VI a, VI b) { // a 系数 b 初值 b[n+1]=a[0]*b[n]+...
                                      //        printf("%d
    ",SZ(b));
            ll ans = 0, pnt = 0;
            int k = SZ(a);
            assert(SZ(a) == SZ(b));
            rep(i, 0, k) _md[k - 1 - i] = -a[i]; _md[k] = 1;
            Md.clear();
            rep(i, 0, k) if (_md[i] != 0) Md.push_back(i);
            rep(i, 0, k) res[i] = base[i] = 0;
            res[0] = 1;
            while ((1ll << pnt) <= n) pnt++;
            for (int p = pnt; p >= 0; p--) {
                mul(res, res, k);
                if ((n >> p) & 1) {
                    for (int i = k - 1; i >= 0; i--) res[i + 1] = res[i]; res[0] = 0;
                    rep(j, 0, SZ(Md)) res[Md[j]] = (res[Md[j]] - res[k] * _md[Md[j]]) % mod;
                }
            }
            rep(i, 0, k) ans = (ans + res[i] * b[i]) % mod;
            if (ans<0) ans += mod;
            return ans;
        }
        VI BM(VI s) {
            VI C(1, 1), B(1, 1);
            int L = 0, m = 1, b = 1;
            rep(n, 0, SZ(s)) {
                ll d = 0;
                rep(i, 0, L + 1) d = (d + (ll)C[i] * s[n - i]) % mod;
                if (d == 0) ++m;
                else if (2 * L <= n) {
                    VI T = C;
                    ll c = mod - d * powmod(b, mod - 2) % mod;
                    while (SZ(C)<SZ(B) + m) C.pb(0);
                    rep(i, 0, SZ(B)) C[i + m] = (C[i + m] + c * B[i]) % mod;
                    L = n + 1 - L; B = T; b = d; m = 1;
                }
                else {
                    ll c = mod - d * powmod(b, mod - 2) % mod;
                    while (SZ(C)<SZ(B) + m) C.pb(0);
                    rep(i, 0, SZ(B)) C[i + m] = (C[i + m] + c * B[i]) % mod;
                    ++m;
                }
            }
            return C;
        }
        int gao(VI a, ll n) {
            VI c = BM(a);
            c.erase(c.begin());
            rep(i, 0, SZ(c)) c[i] = (mod - c[i]) % mod;
            return solve(n, c, VI(a.begin(), a.begin() + SZ(c)));
        }
    };
    
    int main() {
        cin >> n;
        vector<int> V;
        int a[] = {3, 9, 20, 40, 85, 191, 426, 931, 2028, 4444, 9765, 21430, 46970};
        for(int i = 0; i <= 12; i++) V.push_back(a[i]);
        printf("%lld
    ", 1ll * linear_seq::gao(V, n - 1)%mod);
    }
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  • 原文地址:https://www.cnblogs.com/zyysyang/p/11602982.html
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