結果
| 問題 |
No.891 隣接3項間の漸化式
|
| コンテスト | |
| ユーザー |
tute7627
|
| 提出日時 | 2019-09-21 00:04:27 |
| 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 | 5,048 bytes |
| コンパイル時間 | 2,150 ms |
| コンパイル使用メモリ | 179,648 KB |
| 実行使用メモリ | 6,948 KB |
| 最終ジャッジ日時 | 2024-09-15 05:57:56 |
| 合計ジャッジ時間 | 3,298 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 39 |
ソースコード
#include<bits/stdc++.h>
using namespace std;
#define endl '\n'
#define ALL(a) (a).begin(),(a).end()
#define ALLR(a) (a).rbegin(),(a).rend()
#define spa << " " <<
#define lfs <<fixed<<setprecision(10)<<
#define test cout<<"test"<<endl;
#define fi first
#define se second
#define MP make_pair
#define PB push_back
#define EB emplace_back
#define rep(i,n,m) for(ll i = n; i < (ll)(m); i++)
#define rrep(i,n,m) for(ll i = n - 1; i >= (ll)(m); i--)
using ll = long long;
using ld = long double;
const ll MOD = 1e9+7;
//const ll MOD = 998244353;
const ll INF = 1e18;
using P = pair<ll, ll>;
template<typename T>
void chmin(T &a,T b){if(a>b)a=b;}
template<typename T>
void chmax(T &a,T b){if(a<b)a=b;}
void pmod(ll &a,ll b){a=(a+b)%MOD;}
void pmod(ll &a,ll b,ll c){a=(b+c)%MOD;}
void qmod(ll &a,ll b){a=(a*b)%MOD;}
void qmod(ll &a,ll b,ll c){a=(b*c)%MOD;}
ll median(ll a,ll b, ll c){return a+b+c-max({a,b,c})-min({a,b,c});}
void ans1(bool x){if(x) cout<<"Yes"<<endl;else cout<<"No"<<endl;}
void ans2(bool x){if(x) cout<<"YES"<<endl;else cout<<"NO"<<endl;}
void ans3(bool x){if(x) cout<<"Yay!"<<endl;else cout<<":("<<endl;}
template<typename T1,typename T2>
void ans(bool x,T1 y,T2 z){if(x)cout<<y<<endl;else cout<<z<<endl;}
template<typename T>
void debug(vector<vector<T>>v,ll h,ll w){for(ll i=0;i<h;i++)
{cout<<v[i][0];for(ll j=1;j<w;j++)cout spa v[i][j];cout<<endl;}};
void debug(vector<string>v,ll h,ll w){for(ll i=0;i<h;i++)
{for(ll j=0;j<w;j++)cout<<v[i][j];cout<<endl;}};
template<typename T>
void debug(vector<T>v,ll n){cout<<v[0];
for(ll i=1;i<n;i++)cout spa v[i];cout<<endl;};
template<typename T>
vector<vector<T>>vec(ll x, ll y, T w){
vector<vector<T>>v(x,vector<T>(y,w));return v;}
ll gcd(ll x,ll y){ll r;while(y!=0&&(r=x%y)!=0){x=y;y=r;}return y==0?x:y;}
template<typename T>
void emp(map<T,ll>&m, T x){m.emplace(x,0).first->second++;}
vector<ll>dx={1,0,-1,0,1,1,-1,-1};
vector<ll>dy={0,1,0,-1,1,-1,1,-1};
template<typename T>
vector<T> make_v(size_t a,T b){return vector<T>(a,b);}
template<typename... Ts>
auto make_v(size_t a,Ts... ts){
return vector<decltype(make_v(ts...))>(a,make_v(ts...));
}
template< int mod >
struct ModInt {
int x;
ModInt() : x(0) {}
ModInt(int64_t 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-() 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; }
bool operator==(const ModInt &p) const { return x == p.x; }
bool operator!=(const ModInt &p) const { return x != p.x; }
ModInt inverse() const {
int a = x, b = mod, u = 1, v = 0, t;
while(b > 0) {
t = a / b;
swap(a -= t * b, b);
swap(u -= t * v, v);
}
return ModInt(u);
}
ModInt pow(int64_t n) const {
ModInt ret(1), mul(x);
while(n > 0) {
if(n & 1) ret *= mul;
mul *= mul;
n >>= 1;
}
return ret;
}
friend ostream &operator<<(ostream &os, const ModInt &p) {
return os << p.x;
}
friend istream &operator>>(istream &is, ModInt &a) {
int64_t t;
is >> t;
a = ModInt< mod >(t);
return (is);
}
static int get_mod() { return mod; }
};
using modint = ModInt< MOD >;
template<typename T>
struct Matrix{
vector<vector<T>>val;
ll h,w;
Matrix(vector<vector<T>>v):val(v){
h = val.size(); w = val[0].size();
};
Matrix(ll H,ll W,T t):h(H),w(W){
val=vector<vector<T>>(h,vector<T>(w,t));
}
Matrix(ll H,ll W):h(H),w(W){
val=vector<vector<T>>(h,vector<T>(w,(T)0));
for(ll i=0;i<min(h,w);i++)val[i][i]=1;
}
inline vector<T>& operator[](ll i){return val[i];};
Matrix operator*(Matrix p){
vector<vector<T>>ret(this->h,vector<T>(p.w,0));
for(ll i=0;i<this->h;i++){
for(ll j=0;j<p.w;j++){
for(ll o=0;o<p.h;o++){
ret[i][j]+=(this->val[i][o])*p[o][j];
}
}
}
return ret;
}
Matrix<T> pow(ll x){
Matrix<T>ret(h,w);
Matrix<T>tmp(val);
while(x>0){
if(x&1)ret = ret * tmp;
tmp = tmp*tmp;
x>>=1;
}
return ret;
}
void print(){
debug(val,h,w);
}
};
int main(){
cin.tie(NULL);
ios_base::sync_with_stdio(false);
ll res=0,res1=INF,res2=-INF,buf=0;
bool judge = true;
ll a,b,n;cin>>a>>b>>n;
auto tmp=vec(2,2,(modint)0);
tmp[0][0]=a,tmp[0][1]=b,tmp[1][0]=1,tmp[1][1]=0;
Matrix<modint>l(tmp);
if(n==0)cout<<0<<endl;
else if(n==1)cout<<1<<endl;
else{
n--;
cout<<(l.pow(n))[0][0]<<endl;
}
return 0;
}
tute7627