結果

問題 No.541 3 x N グリッド上のサイクルの個数
ユーザー fumofumofuni
提出日時 2022-08-28 02:31:20
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 115 ms / 2,000 ms
コード長 8,298 bytes
コンパイル時間 3,572 ms
コンパイル使用メモリ 239,900 KB
最終ジャッジ日時 2025-01-31 06:35:12
ジャッジサーバーID
(参考情報)
judge3 / judge2
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ファイルパターン 結果
other AC * 62
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ソースコード

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プレゼンテーションモードにする

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[9]={0,1,0,-1,1,1,-1,-1,0};
const ll dx[9]={1,0,-1,0,1,-1,1,-1,0};
template<class T> inline bool chmin(T& a, T b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template<class T> inline bool chmax(T& a, T b) {
if (a < b) {
a = b;
return true;
}
return false;
}
const int mod = MOD;
const int max_n = 200005;
struct mint {
ll x; // typedef long long ll;
mint(ll x=0):x((x%mod+mod)%mod){}
mint operator-() const { return mint(-x);}
mint& operator+=(const mint a) {
if ((x += a.x) >= mod) x -= mod;
return *this;
}
mint& operator-=(const mint a) {
if ((x += mod-a.x) >= mod) x -= mod;
return *this;
}
mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
mint operator+(const mint a) const { return mint(*this) += a;}
mint operator-(const mint a) const { return mint(*this) -= a;}
mint operator*(const mint a) const { return mint(*this) *= a;}
mint pow(ll t) const {
if (!t) return 1;
mint a = pow(t>>1);
a *= a;
if (t&1) a *= *this;
return a;
}
bool operator==(const mint &p) const { return x == p.x; }
bool operator!=(const mint &p) const { return x != p.x; }
// for prime mod
mint inv() const { return pow(mod-2);}
mint& operator/=(const mint a) { return *this *= a.inv();}
mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}
using vm=vector<mint>;
using vvm=vector<vm>;
struct combination {
vector<mint> fact, ifact;
combination(int n):fact(n+1),ifact(n+1) {
assert(n < mod);
fact[0] = 1;
for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;
ifact[n] = fact[n].inv();
for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;
}
mint operator()(int n, int k) {
if (k < 0 || k > n) return 0;
return fact[n]*ifact[k]*ifact[n-k];
}
}comb(max_n);
struct UnionFind {
vector<int> par;
vector<int> edge;
UnionFind(int n) : par(n, -1),edge(n, 0) {}
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) {
x = root(x); y = root(y);
if (x == y) {
edge[x]++;
return false;
}
if (par[x] > par[y]) swap(x, y);
par[x] += par[y];
par[y] = x;
edge[x] += edge[y]+1;
return true;
}
int size(int x) {
return -par[root(x)];
}
};
mint solve(ll n){
map<vl,mint> dp;
mint ans=0;
rep(_,n+1){
map<vl,mint> ndp;
for(auto [v,ret]:dp){
if(v.back()!=2)ans+=ret;
}
for(auto [v,rrr]:dp){
repl(bit,1,1<<3){
if(bit==7&&v==(vl){1,0,1})continue;//
{//
vl nnn;
nnn.push_back(bit>>0&1);
nnn.push_back(bit>>1&1);
nnn.push_back(min(1LL,v[0]));
nnn.push_back(min(1LL,v[1]));
if(nnn==(vl){1,0,0,1}||nnn==(vl){0,1,1,0})continue;
}
{
vl nnn;
nnn.push_back(bit>>1&1);
nnn.push_back(bit>>2&1);
nnn.push_back(min(1LL,v[1]));
nnn.push_back(min(1LL,v[2]));
if(nnn==(vl){1,0,0,1}||nnn==(vl){0,1,1,0})continue;
}
UnionFind uf(6);
if(v[0]&&v[1])uf.merge(0,1);
if(v[1]&&v[2])uf.merge(1,2);
if(v[0]&&(bit>>0&1))uf.merge(0,3);
if(v[1]&&(bit>>1&1))uf.merge(1,4);
if(v[2]&&(bit>>2&1))uf.merge(2,5);
if((bit>>0&1)&&(bit>>1&1))uf.merge(3,4);
if((bit>>1&1)&&(bit>>2&1))uf.merge(4,5);
if(v[0]==v[2]&&v[0])uf.merge(0,2);
vl nv={0,0,0};
rep(i,3){
rep(j,3){
if(uf.same(i,j+3))nv[i]=1;
}
}
if(v[0]&&nv[0]==0)continue;
if(v[1]&&nv[1]==0)continue;
if(v[2]&&nv[2]==0)continue;
vl con(3);map<ll,ll> mp;ll now=1;
rep(i,3){
if(bit>>i&1){
ll p=uf.root(i+3);
if(mp.count(p))con[i]=mp[p];
else{
mp[p]=now;now++;
con[i]=mp[p];
}
}
}
ndp[con]+=rrr;
}
}
ndp[{0,0,1}]+=1;
ndp[{0,1,1}]+=1;
ndp[{1,1,1}]+=1;
ndp[{0,1,0}]+=1;
ndp[{1,0,0}]+=1;
ndp[{1,1,0}]+=1;
ndp[{1,0,2}]+=1;
swap(dp,ndp);
}
return ans;
}
vector<mint> BerlekampMassey(const vector<mint> &s) {
const int N = (int)s.size();
vector<mint> b, c;
b.reserve(N + 1);
c.reserve(N + 1);
b.push_back(mint(1));
c.push_back(mint(1));
mint y = mint(1);
for (int ed = 1; ed <= N; ed++) {
int l = int(c.size()), m = int(b.size());
mint x = 0;
for (int i = 0; i < l; i++) x += c[i] * s[ed - l + i];
b.emplace_back(mint(0));
m++;
if (x == mint(0)) continue;
mint freq = x / y;
if (l < m) {
auto tmp = c;
c.insert(begin(c), m - l, mint(0));
for (int i = 0; i < m; i++) c[m - 1 - i] -= freq * b[m - 1 - i];
b = tmp;
y = x;
} else {
for (int i = 0; i < m; i++) c[l - 1 - i] -= freq * b[m - 1 - i];
}
}
reverse(begin(c), end(c));
return c;
}
template <typename mint>
vector<mint> kitamasa(vector<mint> Q,vector<mint> a) {
assert(!Q.empty() && Q[0] != 0);
assert((int)a.size() >= int(Q.size()) - 1);
vector<mint> P(Q.size()*2-2);
for(ll i=0;i<Q.size()-1;i++){
for(ll j=0;j<Q.size();j++){
P[i+j]+=a[i]*Q[j];
}
}
P.resize(Q.size() - 1);
return P;
}
template<class T>
struct bostan_mori {
vector<T> p, q;
bostan_mori(vector<T> &_p, vector<T> &_q) : p(_p), q(_q) {}
void rever(vector<T> &f) const {
int d = f.size();
rep(i, d) if (i&1) f[i] = -f[i];
}
void even(vector<T> &f) const {
int d = (f.size() + 1) >> 1;
rep(i, d) f[i] = f[i<<1];
f.resize(d);
}
void odd(vector<T> &f) const {
int d = f.size() >> 1;
rep(i, d) f[i] = f[i<<1|1];
f.resize(d);
}
vector<T> convolution(vector<T> a,vector<T> b) const{
int n=a.size(),m=b.size();
vector<T> c(n+m-1);
rep(i,n)rep(j,m)c[i+j]+=a[i]*b[j];
return c;
}
T operator[] (ll n) const {
vector<T> _p(p), _q(q), _q_rev(q);
rever(_q_rev);
for (; n; n >>= 1) {
_p = convolution(move(_p), _q_rev);
if (n&1) odd(_p);
else even(_p);
_q = convolution(move(_q), move(_q_rev));
even(_q);
_q_rev = _q; rever(_q_rev);
}
return _p[0] / _q[0];
}
};
//https://nyaannyaan.github.io/library/fps/kitamasa.hpp
//https://atcoder.jp/contests/tdpc/submissions/34362182
//prefixn
bostan_mori<mint> interpolation(vm a){
auto q=BerlekampMassey(a);
auto p=kitamasa(q,a);
return bostan_mori<mint>(p,q);
}
int main(){
ll n;cin >> n;
//cout << solve(n) << endl;
vm v(90);
rep(i,90)v[i]=solve(i);
auto bm=interpolation(v);
cout << bm[n] << endl;
}
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