結果
| 問題 |
No.1879 How many matchings?
|
| コンテスト | |
| ユーザー |
milanis48663220
|
| 提出日時 | 2022-03-18 22:23:17 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 5,318 bytes |
| コンパイル時間 | 1,273 ms |
| コンパイル使用メモリ | 117,180 KB |
| 最終ジャッジ日時 | 2025-01-28 10:28:56 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 9 WA * 6 |
ソースコード
#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>
#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;
typedef long long ll;
template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
return vector<vector<T>>(n, vector<T>(m, v));
}
template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}
template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
if(v.empty()) {
cout << endl;
return;
}
for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
cout << v.back() << endl;
}
const ll MOD = 1000000007;
class ModInt{
public:
ll v;
ModInt(ll _v = 0){
if(_v < 0) _v = (_v%MOD)+MOD;
if(_v >= MOD) _v %= MOD;
v = _v;
}
ModInt operator+(ll n){
return ModInt((v+n)%MOD);
}
ModInt operator-(ll n){
return ModInt((v-n+MOD)%MOD);
}
ModInt operator*(ll n){
if(n >= MOD) n %= MOD;
return ModInt((v*n)%MOD);
}
ModInt operator/(ll n){
return ModInt((ModInt(n).inv()*v).v%MOD);
}
ModInt &operator+=(ll n){
v = (v+n)%MOD;
return *this;
}
ModInt &operator-=(ll n){
v = (v-n+MOD)%MOD;
return *this;
}
ModInt &operator*=(ll n){
v = (v*n+MOD)%MOD;
return *this;
}
ModInt operator+(ModInt n){
return ModInt((v+n.v)%MOD);
}
ModInt operator-(ModInt n){
return ModInt((v-n.v+MOD)%MOD);
}
ModInt operator*(ModInt n){
return ModInt((v*n.v)%MOD);
}
ModInt operator/(ModInt n){
return ModInt((n.inv()*v).v%MOD);
}
ModInt &operator+=(ModInt n){
v = (v+n.v)%MOD;
return *this;
}
ModInt &operator-=(ModInt n){
v = (v-n.v+MOD)%MOD;
return *this;
}
ModInt &operator*=(ModInt n){
v = (v*n.v)%MOD;
return *this;
}
bool operator==(ModInt n){
return v == n.v;
}
bool operator!=(ModInt n){
return v != n.v;
}
ModInt &operator=(ll n){
v = n%MOD;
return *this;
}
ModInt inv(){
if(v == 1) return ModInt(1);
else return ModInt(MOD-ModInt(MOD%v).inv().v*(MOD/v)%MOD);
}
};
ostream& operator<<(ostream& os, const ModInt& m){
os << m.v;
return os;
}
istream & operator >> (istream &in, ModInt &m){
in >> m.v;
return in;
}
ModInt pow(ModInt a, ll n) {
assert(n >= 0);
ModInt ans = 1;
while (n > 0) {
if (n&1) ans = ans*a;
a = a*a;
n >>= 1;
}
return ans;
}
using mint = ModInt;
template<typename T, int N, int M>
class Matrix {
public:
array<array<T, M>, N> dat;
Matrix(T val) {
for(int i = 0; i < N; i++){
for(int j = 0; j < M; j++){
dat[i][j] = val;
}
}
}
Matrix(array<array<T, M>, N> dat): dat(dat){ }
array<T, M>& operator[](int x) {
return dat[x];
}
};
template<typename T, int N, int M, int K>
Matrix<T, N, K> operator*(Matrix<T, N, M> a, Matrix<T, M, K> b){
Matrix<T, N, K> c(T(0));
for(int i = 0; i < N; i++){
for(int j = 0; j < K; j++){
for(int k = 0; k < M; k++){
c.dat[i][j] += a.dat[i][k]*b.dat[k][j];
}
}
}
return c;
}
template<typename T, int N>
Matrix<T, N, N> operator^(Matrix<T, N, N> m, long long r){
Matrix<T, N, N> ans(T(0));
for(int i = 0; i < N; i++) ans[i][i] = T(1);
while (r > 0) {
if (r&1) ans = (ans*m);
m = (m*m);
r >>= 1;
}
return ans;
}
template <typename T, int N, int M>
void print_mat(Matrix<T, N, M> a){
for(int i = 0; i < N; i++){
for(int j = 0; j < M; j++){
cout << a.dat[i][j] << ' ';
}
cout << endl;
}
}
template <typename T, int N, int M>
ostream& operator<<(ostream& os, const Matrix<T, N, M>& m){
print_mat<T, N, M>(m);
return os;
}
mint fib_kth(int k){
Matrix<mint, 2, 2> A(mint(0));
Matrix<mint, 2, 1> a(mint(0));
a[0][0] = 0;
a[1][0] = 1;
A[0][1] = 1;
A[1][0] = 1; A[1][1] = 1;
auto u = (A^k)*a;
return u[0][0];
}
void test(int n){
mint sum = 0;
for(int i = 0; i <= n; i++){
sum += fib_kth(i)*fib_kth(n-i);
}
cout << sum << endl;
cout << (fib_kth(n+1)*n-fib_kth(n)+fib_kth(n-1)*n)/5 << endl;
}
mint calc(ll n){
return (fib_kth(n+1)*n-fib_kth(n)+fib_kth(n-1)*n)/5;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout << setprecision(10) << fixed;
ll n; cin >> n;
if(n%2 == 0){
cout << fib_kth(n/2+1) << endl;
}else{
cout << calc(n/2+2)+calc(n/2+1) << endl;
}
}
milanis48663220