結果
問題 | No.840 ほむほむほむら |
ユーザー |
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提出日時 | 2020-07-15 20:41:29 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 371 ms / 4,000 ms |
コード長 | 2,582 bytes |
コンパイル時間 | 2,369 ms |
コンパイル使用メモリ | 207,460 KB |
最終ジャッジ日時 | 2025-01-11 21:13:27 |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 25 |
ソースコード
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<ll, ll> p_ll; template<class T> void debug(T itr1, T itr2) { auto now = itr1; while(now<itr2) { cout << *now << " "; now++; } cout << endl; } #define repr(i,from,to) for (ll i=(ll)from; i<(ll)to; i++) #define all(vec) vec.begin(), vec.end() #define rep(i,N) repr(i,0,N) #define per(i,N) for (int i=(int)N-1; i>=0; i--) const ll MOD = 998244353; const ll LLINF = pow(2,61)-1; const int INF = pow(2,30)-1; vector<ll> fac; void c_fac(int x=pow(10,6)+10) { fac.resize(x,true); rep(i,x) fac[i] = i ? (fac[i-1]*i)%MOD : 1; } ll inv(ll a, ll m=MOD) { ll b = m, x = 1, y = 0; while (b!=0) { int d = a/b; a -= b*d; swap(a,b); x -= y*d; swap(x,y); } return (x+m)%m; } ll nck(ll n, ll k) { return fac[n]*inv(fac[k]*fac[n-k]%MOD)%MOD; } ll gcd(ll a, ll b) { if (a<b) swap(a,b); return b==0 ? a : gcd(b, a%b); } ll lcm(ll a, ll b) { return a/gcd(a,b)*b; } // ---------------------------------------------------------------------- // ---------------------------------------------------------------------- vector<vector<ll>> matdot(vector<vector<ll>> A, vector<vector<ll>> B) { if (A[0].size()!=B.size()) return {{}}; ll h = A.size(), w = B[0].size(), x = A[0].size(); vector<vector<ll>> result(h,vector<ll>(w,0)); rep(i,h) rep(j,w) rep(k,x) result[i][j] = (result[i][j] + A[i][k]*B[k][j])%MOD; return result; } vector<vector<ll>> matpow(vector<vector<ll>> A, ll n) { if (A.size()!=A[0].size()) return {{}}; int N = A.size(); vector<vector<ll>> result(N,vector<ll>(N,0)), now; copy(all(A),back_inserter(now)); rep(i,N) result[i][i] = 1; ll p2 = 1; while (n>=p2) { if (n&p2) result = matdot(result,now); now = matdot(now,now); p2 *= 2; } return result; } // ---------------------------------------------------------------------- // ---------------------------------------------------------------------- int main() { ll N, K; cin >> N >> K; ll sn = pow(K,3); vector<vector<ll>> hmr(sn); rep(i,sn) hmr[i].resize(sn,0); rep(now,K) rep(m,K) rep(r,K) { ll from = now + m * K + r * K*K; ll hto = (now+m)%K + m * K + r * K*K; ll mto = now + (m+r)%K * K + r * K*K; ll rto = now + m * K + (r+1)%K * K*K; hmr[from][hto]++; hmr[from][mto]++; hmr[from][rto]++; } // rep(i,sn) debug(all(hmr[i])); vector<vector<ll>> hmrk = matpow(hmr, N); // rep(i,sn) debug(all(hmrk[i])); ll result = 0; rep(i,sn) if (i%K==0) result = (result+hmrk[0][i]) % MOD; cout << result << endl; return 0; }