結果

問題 No.802 だいたい等差数列
ユーザー noshi91noshi91
提出日時 2019-03-17 22:33:13
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 149 ms / 2,000 ms
コード長 6,381 bytes
コンパイル時間 664 ms
コンパイル使用メモリ 73,908 KB
実行使用メモリ 8,320 KB
最終ジャッジ日時 2024-07-08 00:37:01
合計ジャッジ時間 2,105 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
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 2 ms
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 2 ms
5,376 KB
testcase_04 AC 1 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 2 ms
5,376 KB
testcase_07 AC 2 ms
5,376 KB
testcase_08 AC 1 ms
5,376 KB
testcase_09 AC 2 ms
5,376 KB
testcase_10 AC 7 ms
7,152 KB
testcase_11 AC 9 ms
8,320 KB
testcase_12 AC 4 ms
5,632 KB
testcase_13 AC 8 ms
8,064 KB
testcase_14 AC 23 ms
6,912 KB
testcase_15 AC 53 ms
5,376 KB
testcase_16 AC 12 ms
6,912 KB
testcase_17 AC 2 ms
5,376 KB
testcase_18 AC 2 ms
5,376 KB
testcase_19 AC 21 ms
5,888 KB
testcase_20 AC 145 ms
7,104 KB
testcase_21 AC 149 ms
8,320 KB
testcase_22 AC 8 ms
8,320 KB
testcase_23 AC 50 ms
5,376 KB
testcase_24 AC 2 ms
5,376 KB
testcase_25 AC 1 ms
5,376 KB
testcase_26 AC 4 ms
5,376 KB
testcase_27 AC 3 ms
5,376 KB
testcase_28 AC 50 ms
5,504 KB
testcase_29 AC 145 ms
8,320 KB
testcase_30 AC 2 ms
5,376 KB
testcase_31 AC 1 ms
5,376 KB
testcase_32 AC 2 ms
5,376 KB
testcase_33 AC 5 ms
5,376 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 #

//#define NDEBUG
#include <cstddef>
#include <cstdint>
#include <vector>

namespace n91 {

	using i8 = std::int_least8_t;
	using i32 = std::int_least32_t;
	using i64 = std::int_least64_t;
	using u8 = std::uint_least8_t;
	using u32 = std::uint_least32_t;
	using u64 = std::uint_least64_t;
	using isize = std::ptrdiff_t;
	using usize = std::size_t;

	class rep {
		const usize f, l;

	public:
		class itr {
			friend rep;
			usize i;
			constexpr itr(const usize x) noexcept : i(x) {}

		public:
			void operator++() noexcept { ++i; }
			constexpr usize operator*() const noexcept { return i; }
			constexpr bool operator!=(const itr x) const noexcept { return i != x.i; }
		};
		constexpr rep(const usize first, const usize last) noexcept
			: f(first), l(last) {}
		constexpr itr begin() const noexcept { return itr(f); }
		constexpr itr end() const noexcept { return itr(l); }
	};
	class revrep {
		const usize f, l;

	public:
		class itr {
			friend revrep;
			usize i;
			constexpr itr(usize x) noexcept : i(x) {}

		public:
			void operator++() noexcept { --i; }
			constexpr usize operator*() const noexcept { return i; }
			constexpr bool operator!=(const itr x) const noexcept { return i != x.i; }
		};
		constexpr revrep(usize first, usize last) noexcept : f(--first), l(--last) {}
		constexpr itr begin() const noexcept { return itr(l); }
		constexpr itr end() const noexcept { return itr(f); }
	};
	template <class T> using vec_alias = std::vector<T>;
	template <class T> auto md_vec(const usize n, const T &value) {
		return std::vector<T>(n, value);
	}
	template <class... Args> auto md_vec(const usize n, Args... args) {
		return std::vector<decltype(md_vec(args...))>(n, md_vec(args...));
	}
	template <class T> constexpr T difference(const T &a, const T &b) {
		return a < b ? b - a : a - b;
	}

} // namespace n91

#include <cassert>
#include <cstdint>

namespace n91 {

	template <std::uint_least32_t Modulus> class modint {
		using u32 = std::uint_least32_t;
		using u64 = std::uint_least64_t;
		using i64 = std::int_fast64_t;
		class optimize_tag_t {};
		static constexpr optimize_tag_t optimize_tag{};

	public:
		using value_type = u32;
		value_type a;

	private:
		static constexpr value_type cst(i64 x) noexcept {
			x %= static_cast<i64>(Modulus);
			if (x < static_cast<i64>(0)) {
				x += static_cast<i64>(Modulus);
			}
			return static_cast<value_type>(x);
		}

		constexpr modint(optimize_tag_t, const value_type &x) noexcept : a(x) {}

	public:
		constexpr modint() noexcept : a(static_cast<value_type>(0)) {}
		constexpr modint(const i64 &x) noexcept : a(cst(x)) {}
		constexpr value_type value() const noexcept { return a; }
		constexpr modint operator+(const modint &o) const noexcept {
			return modint(optimize_tag,
				a + o.a < Modulus ? a + o.a : a + o.a - Modulus);
		}
		constexpr modint operator-(const modint &o) const noexcept {
			return modint(optimize_tag, a < o.a ? a + Modulus - o.a : a - o.a);
		}
		constexpr modint operator*(const modint &o) const noexcept {
			return modint(
				optimize_tag,
				static_cast<value_type>(static_cast<u64>(a) * static_cast<u64>(o.a) %
					static_cast<u64>(Modulus)));
		}
		constexpr modint operator/(const modint &o) const {
			return modint(
				optimize_tag,
				static_cast<value_type>(static_cast<u64>(a) * static_cast<u64>((~o).a) %
					static_cast<u64>(Modulus)));
		}
		modint &operator+=(const modint &o) noexcept {
			if ((a += o.a) >= Modulus)
				a -= Modulus;
			return *this;
		}
		modint &operator-=(const modint &o) noexcept {
			if (a < o.a)
				a += Modulus;
			a -= o.a;
			return *this;
		}
		modint &operator*=(const modint &o) noexcept {
			a = static_cast<value_type>(static_cast<u64>(a) * static_cast<u64>(o.a) %
				static_cast<u64>(Modulus));
			return *this;
		}
		modint &operator/=(const modint &o) {
			a = static_cast<u64>(a) * (~o).a % Modulus;
			return *this;
		}
		constexpr modint inverse() const noexcept {
			assert(a != static_cast<value_type>(0) && "0 does not have inverse");
			return pow(static_cast<u64>(Modulus - static_cast<value_type>(2)));
		}
		constexpr modint operator~() const noexcept { return inverse(); }
		constexpr modint operator-() const noexcept {
			if (a == static_cast<value_type>(0)) {
				return modint(optimize_tag, static_cast<value_type>(0));
			}
			else {
				return modint(optimize_tag, Modulus - a);
			}
		}
		modint &operator++() noexcept {
			if (++a == Modulus) {
				a = static_cast<value_type>(0);
			}
			return *this;
		}
		modint &operator--() noexcept {
			if (a == static_cast<value_type>(0)) {
				a = Modulus;
			}
			--a;
			return *this;
		}
		constexpr bool operator==(const modint &o) const noexcept { return a == o.a; }
		constexpr bool operator!=(const modint &o) const noexcept { return a != o.a; }
		constexpr bool operator<(const modint &o) const noexcept { return a < o.a; }
		constexpr bool operator<=(const modint &o) const noexcept { return a <= o.a; }
		constexpr bool operator>(const modint &o) const noexcept { return a > o.a; }
		constexpr bool operator>=(const modint &o) const noexcept { return a >= o.a; }
		constexpr explicit operator bool() const noexcept { return a; }
		constexpr explicit operator value_type() const noexcept { return a; }
		modint pow(u64 x) const noexcept {
			u64 t = a, u = 1;
			while (x) {
				if (x & 1)
					u = u * t % Modulus;
				t = (t * t) % Modulus;
				x >>= 1;
			}
			return modint(optimize_tag, static_cast<value_type>(u));
		}
	};

} // namespace n91


#include <algorithm>
#include <iostream>
#include <utility>
#include <array>

namespace n91 {

	void main_() {
		using mint = modint<1000000007>;
		usize n;
		u32 m, d1, d2;
		std::cin >> n >> m >> d1 >> d2;
		--n;
		if (m <= d1*n) {
			std::cout << 0 << std::endl;
			return;
		}
		m -= d1*n;
		const u32 d = d2 - d1 + 1;

		std::vector<mint> fact(m + n+1);
		fact[0] = 1;
		for (const auto i : rep(1, m + n+1)) {
			fact[i] = fact[i - 1] * i;
		}
		mint ans = 0;
		const mint m_ = m, n_ = n, d_ = d;
		for (usize i = 0;d*i < m&&i <= n;++i) {
			const usize x = d*i;
			const mint x_ = x;
			mint temp = (m_ + n_ - x_ - 1)*(m_ + n_ - x_)*fact[m + n - d*i - 2] / (n_ + 1) / fact[n - i] / fact[i] / fact[m - d*i - 1];
			if (i % 2 == 0) {
				ans += temp;
			}
			else {
				ans -= temp;
			}
		}
		std::cout << ans.a << std::endl;
	}

} // namespace n91

int main() {
	n91::main_();
	return 0;
}
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