結果

問題 No.1073 無限すごろく
ユーザー QCFiumQCFium
提出日時 2020-06-05 22:04:19
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 2,965 bytes
コンパイル時間 1,501 ms
コンパイル使用メモリ 171,396 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-12-17 15:06:37
合計ジャッジ時間 2,434 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 30
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
int ri() {
int n;
scanf("%d", &n);
return n;
}
#define MOD 1000000007
template<int mod>
struct ModInt{
int x;
ModInt():x(0){}
ModInt(long long y):x(y>=0?y%mod:(mod-(-y)%mod)%mod){}
ModInt &operator+=(const ModInt &p){
if((x+=p.x)>=mod)x-=mod;
return *this;
}
ModInt &operator-=(const ModInt &p){
if((x+=mod-p.x)>=mod)x-=mod;
return *this;
}
ModInt &operator*=(const ModInt &p){
x=(int)(1LL*x*p.x%mod);
return *this;
}
ModInt &operator/=(const ModInt &p){
*this*=p.inverse();
return *this;
}
ModInt &operator^=(long long p){
ModInt res = 1;
for (; p; p >>= 1) {
if (p & 1) res *= *this;
*this *= *this;
}
return *this = res;
}
ModInt operator-()const{return ModInt(-x);}
ModInt operator+(const ModInt &p)const{return ModInt(*this)+=p;}
ModInt operator-(const ModInt &p)const{return ModInt(*this)-=p;}
ModInt operator*(const ModInt &p)const{return ModInt(*this)*=p;}
ModInt operator/(const ModInt &p)const{return ModInt(*this)/=p;}
ModInt operator^(long long p)const{return ModInt(*this)^=p;}
bool operator==(const ModInt &p)const{return x==p.x;}
bool operator!=(const ModInt &p)const{return x!=p.x;}
explicit operator int() const { return x; } // added by QCFium
ModInt operator=(const int p) {x = p; return ModInt(*this);} // added by QCFium
ModInt inverse()const{
int a=x,b=mod,u=1,v=0,t;
while(b>0){
t=a/b;
a-=t*b;
std::swap(a,b);
u-=t*v;
std::swap(u,v);
}
return ModInt(u);
}
friend std::ostream &operator<<(std::ostream &os,const ModInt<mod> &p){
return os<<p.x;
}
friend std::istream &operator>>(std::istream &is,ModInt<mod> &a){
long long x;
is>>x;
a=ModInt<mod>(x);
return (is);
}
};
typedef ModInt<MOD> mint;
struct MComb {
std::vector<mint> fact;
std::vector<mint> inv;
MComb (int n) { // O(n + log(mod))
fact = std::vector<mint>(n + 1, 1);
for (int i = 1; i <= n; i++) fact[i] = fact[i - 1] * mint(i);
inv.resize(n + 1);
inv[n] = fact[n] ^ (MOD - 2);
for (int i = n; i--; ) inv[i] = inv[i + 1] * mint(i + 1);
}
mint ncr(int n, int r) {
return fact[n] * inv[r] * inv[n - r];
}
mint npr(int n, int r) {
return fact[n] * inv[n - r];
}
mint nhr(int n, int r) {
assert(n + r - 1 < (int) fact.size());
return ncr(n + r - 1, r);
}
};
int main() {
int64_t n;
scanf("%" SCNd64, &n);
mint mat[6][6];
for (int i = 0; i < 6; i++) {
if (i) mat[i][i - 1] = 1;
else {
for (int j = 0; j < 6; j++) mat[i][j] = mint(1) / 6;
}
}
mint res[6] = { 1 };
for (auto i = n; i; i >>= 1) {
if (i & 1) {
mint next[6] = { 0 };
for (int j = 0; j < 6; j++) for (int k = 0; k < 6; k++) next[k] += res[j] * mat[j][k];
memcpy(res, next, sizeof(next));
}
mint next[6][6] = { { 0 } };
for (int j = 0; j < 6; j++) for (int k = 0; k < 6; k++) for (int l = 0; l < 6; l++) next[j][l] += mat[j][k] * mat[k][l];
memcpy(mat, next, sizeof(next));
}
std::cout << res[0] << std::endl;
return 0;
}
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