結果

問題 No.978 Fibonacci Convolution Easy
ユーザー ゆにぽけゆにぽけ
提出日時 2023-10-26 00:29:43
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 23 ms / 2,000 ms
コード長 2,798 bytes
コンパイル時間 1,142 ms
コンパイル使用メモリ 127,432 KB
実行使用メモリ 11,724 KB
最終ジャッジ日時 2024-09-25 08:29:25
合計ジャッジ時間 2,099 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge5
このコードへのチャレンジ
（要ログイン）

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 5 ms
11,556 KB
testcase_01 AC 12 ms
11,576 KB
testcase_02 AC 8 ms
11,528 KB
testcase_03 AC 22 ms
11,632 KB
testcase_04 AC 9 ms
11,536 KB
testcase_05 AC 5 ms
11,508 KB
testcase_06 AC 11 ms
11,644 KB
testcase_07 AC 17 ms
11,632 KB
testcase_08 AC 13 ms
11,644 KB
testcase_09 AC 18 ms
11,672 KB
testcase_10 AC 23 ms
11,680 KB
testcase_11 AC 10 ms
11,576 KB
testcase_12 AC 5 ms
11,660 KB
testcase_13 AC 11 ms
11,492 KB
testcase_14 AC 6 ms
11,636 KB
testcase_15 AC 12 ms
11,724 KB
testcase_16 AC 23 ms
11,512 KB
testcase_17 AC 23 ms
11,572 KB
testcase_18 AC 4 ms
11,572 KB
testcase_19 AC 5 ms
11,636 KB
testcase_20 AC 5 ms
11,580 KB
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 # 

#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cassert>
#include<cmath>
#include<ctime>
#include<iomanip>
#include<numeric>
#include<stack>
#include<queue>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<bitset>
#include<random>
#include<functional>
#include<utility>
using namespace std;
template<int m> struct modint
{
	private:
	unsigned int value;
	static constexpr int mod() {return m;}

	public:
	constexpr modint(const long long x = 0) noexcept
	{
		long long y = x;
		if(y < 0 || y >= mod())
		{
			y %= mod();
			if(y < 0) y += mod();
		}
		value = (unsigned int)y;
	}
	constexpr unsigned int val() noexcept {return value;}
	constexpr modint &operator+=(const modint &other) noexcept
	{
		value += other.value;
		if(value >= mod()) value -= mod();
		return *this;
	}
	constexpr modint &operator-=(const modint &other) noexcept
	{
		unsigned int x = value;
		if(x < other.value) x += mod();
		x -= other.value;
		value = x;
		return *this;
	}
	constexpr modint &operator*=(const modint &other) noexcept
	{
		unsigned long long x = value;
		x *= other.value;
		value = (unsigned int) (x % mod());
		return *this;
	}
	constexpr modint &operator/=(const modint &other) noexcept
	{
		return *this *= other.inverse();
	}
	constexpr modint inverse() const noexcept
	{
		assert(value);
		long long a = value,b = mod(),x = 1,y = 0;
		while(b)
		{
			long long q = a/b;
			a -= q*b; swap(a,b);
			x -= q*y; swap(x,y);
		}
		return modint(x);
	}
	constexpr modint power(long long N) const noexcept
	{
		assert(N >= 0);
		modint p = *this,ret = 1;
		while(N)
		{
			if(N & 1) ret *= p;
			p *= p;
			N >>= 1;
		}
		return ret;
	}
	constexpr modint operator+() {return *this;}
	constexpr modint operator-() {return modint() - *this;}
	constexpr modint &operator++(int) noexcept {return *this += 1;}
	constexpr modint &operator--(int) noexcept {return *this -= 1;}
	friend modint operator+(const modint& lhs, const modint& rhs) {return modint(lhs) += rhs;}
	friend modint operator-(const modint& lhs, const modint& rhs) {return modint(lhs) -= rhs;}
	friend modint operator*(const modint& lhs, const modint& rhs) {return modint(lhs) *= rhs;}
	friend modint operator/(const modint& lhs, const modint& rhs) {return modint(lhs) /= rhs;}
	friend ostream &operator<<(ostream &os,const modint &x) {return os << x.value;}
};
//using mint = modint<998244353>;
using mint = modint<1000000007>;
int N,P;
mint A[1 << 21];
void solve()
{
	cin >> N >> P;
	A[0] = 0,A[1] = 1;
	for(int i = 2;i < N;i++) A[i] = P*A[i-1]+A[i-2];
	mint S = 0,ans = 0;
	for(int i = 0;i < N;i++)
	{
		S += A[i];
		ans += S*A[i];
	}
	cout << ans << endl;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
}
0