#644328 (C++17) No.802 だいたい等差数列

提出ソース
結果

問題	No.802 だいたい等差数列
ユーザー	yuruhiya
提出日時	2021-04-04 10:13:17
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	AC
実行時間	80 ms / 2,000 ms
コード長	20,628 bytes
コンパイル時間	8,051 ms
コンパイル使用メモリ	631,208 KB
実行使用メモリ	50,432 KB
最終ジャッジ日時	2024-06-08 01:44:17
合計ジャッジ時間	10,788 ms
ジャッジサーバーID （参考情報）	judge2 / judge3
このコードへのチャレンジ
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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	65 ms 50,304 KB
testcase_01	AC	67 ms 50,300 KB
testcase_02	AC	66 ms 50,304 KB
testcase_03	AC	69 ms 50,288 KB
testcase_04	AC	66 ms 50,176 KB
testcase_05	AC	73 ms 50,176 KB
testcase_06	AC	68 ms 50,400 KB
testcase_07	AC	71 ms 50,304 KB
testcase_08	AC	68 ms 50,432 KB
testcase_09	AC	71 ms 50,304 KB
testcase_10	AC	66 ms 50,304 KB
testcase_11	AC	74 ms 50,176 KB
testcase_12	AC	67 ms 50,304 KB
testcase_13	AC	72 ms 50,408 KB
testcase_14	AC	71 ms 50,304 KB
testcase_15	AC	77 ms 50,368 KB
testcase_16	AC	74 ms 50,304 KB
testcase_17	AC	74 ms 50,304 KB
testcase_18	AC	68 ms 50,176 KB
testcase_19	AC	72 ms 50,196 KB
testcase_20	AC	74 ms 50,396 KB
testcase_21	AC	80 ms 50,304 KB
testcase_22	AC	76 ms 50,156 KB
testcase_23	AC	78 ms 50,304 KB
testcase_24	AC	70 ms 50,304 KB
testcase_25	AC	76 ms 50,360 KB
testcase_26	AC	69 ms 50,304 KB
testcase_27	AC	74 ms 50,304 KB
testcase_28	AC	69 ms 50,176 KB
testcase_29	AC	77 ms 50,228 KB
testcase_30	AC	66 ms 50,288 KB
testcase_31	AC	74 ms 50,432 KB
testcase_32	AC	66 ms 50,304 KB
testcase_33	AC	75 ms 50,304 KB
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ソースコード

raw source code
#line 2 "/home/yuruhiya/programming/library/Utility/get_MOD.cpp"
constexpr long long get_MOD() {
#ifdef SET_MOD
	return SET_MOD;
#else
	return 1000000007;
#endif
}
#line 3 "/home/yuruhiya/programming/library/Utility/constants.cpp"
#include <vector>
#include <string>
#include <utility>
#include <queue>

#define rep(i, n) for (int i = 0; i < (n); ++i)
#define FOR(i, m, n) for (int i = (m); i < (n); ++i)
#define rrep(i, n) for (int i = (n)-1; i >= 0; --i)
#define rfor(i, m, n) for (int i = (m); i >= (n); --i)
#define loop(n) rep(i##__COUNTER__, n)
#define unless(c) if (!(c))
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define range_it(a, l, r) (a).begin() + (l), (a).begin() + (r)

using ll = long long;
using LD = long double;
using VB = std::vector<bool>;
using VVB = std::vector<VB>;
using VI = std::vector<int>;
using VVI = std::vector<VI>;
using VL = std::vector<ll>;
using VVL = std::vector<VL>;
using VS = std::vector<std::string>;
using VD = std::vector<LD>;
using PII = std::pair<int, int>;
using VP = std::vector<PII>;
using PLL = std::pair<ll, ll>;
using VPL = std::vector<PLL>;
template <class T> using PQ = std::priority_queue<T>;
template <class T> using PQS = std::priority_queue<T, std::vector<T>, std::greater<T>>;

constexpr int inf = 1000000000;
constexpr long long inf_ll = 1000000000000000000ll, MOD = get_MOD();
constexpr long double PI = 3.14159265358979323846, EPS = 1e-12;
#line 2 "/home/yuruhiya/programming/library/Utility/Scanner.cpp"
#include <iostream>
#line 6 "/home/yuruhiya/programming/library/Utility/Scanner.cpp"
#include <tuple>
#include <type_traits>

#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#define putchar_unlocked _putchar_nolock
#define fwrite_unlocked fwrite
#define fflush_unlocked fflush
#endif
class Scanner {
	static int gc() {
		return getchar_unlocked();
	}
	static char next_char() {
		char c;
		scan(c);
		return c;
	}
	template <class T> static void scan(T& v) {
		std::cin >> v;
	}
	static void scan(char& v) {
		while (std::isspace(v = gc()))
			;
	}
	static void scan(bool& v) {
		v = next_char() != '0';
	}
	static void scan(std::vector<bool>::reference v) {
		bool b;
		scan(b);
		v = b;
	}
	static void scan(std::string& v) {
		v.clear();
		for (char c = next_char(); !std::isspace(c); c = gc()) v += c;
	}
	static void scan(int& v) {
		v = 0;
		bool neg = false;
		char c = next_char();
		if (c == '-') {
			neg = true;
			c = gc();
		}
		for (; std::isdigit(c); c = gc()) v = v * 10 + (c - '0');
		if (neg) v = -v;
	}
	static void scan(long long& v) {
		v = 0;
		bool neg = false;
		char c = next_char();
		if (c == '-') {
			neg = true;
			c = gc();
		}
		for (; std::isdigit(c); c = gc()) v = v * 10 + (c - '0');
		if (neg) v = -v;
	}
	static void scan(double& v) {
		v = 0;
		double dp = 1;
		bool neg = false, after_dp = false;
		char c = next_char();
		if (c == '-') {
			neg = true;
			c = gc();
		}
		for (; std::isdigit(c) || c == '.'; c = gc()) {
			if (c == '.') {
				after_dp = true;
			} else if (after_dp) {
				v += (c - '0') * (dp *= 0.1);
			} else {
				v = v * 10 + (c - '0');
			}
		}
		if (neg) v = -v;
	}
	static void scan(long double& v) {
		v = 0;
		long double dp = 1;
		bool neg = false, after_dp = false;
		char c = next_char();
		if (c == '-') {
			neg = true;
			c = gc();
		}
		for (; std::isdigit(c) || c == '.'; c = gc()) {
			if (c == '.') {
				after_dp = true;
			} else if (after_dp) {
				v += (c - '0') * (dp *= 0.1);
			} else {
				v = v * 10 + (c - '0');
			}
		}
		if (neg) v = -v;
	}
	template <class T, class U> static void scan(std::pair<T, U>& v) {
		scan(v.first);
		scan(v.second);
	}
	template <class T, std::enable_if_t<!std::is_same_v<bool, T>, std::nullptr_t> = nullptr>
	static void scan(std::vector<T>& v) {
		for (auto& e : v) scan(e);
	}
	template <class T, std::enable_if_t<std::is_same_v<bool, T>, std::nullptr_t> = nullptr>
	static void scan(std::vector<T>& v) {
		for (auto e : v) scan(e);
	}
	template <std::size_t N = 0, class T> static void scan_tuple_impl(T& v) {
		if constexpr (N < std::tuple_size_v<T>) {
			scan(std::get<N>(v));
			scan_tuple_impl<N + 1>(v);
		}
	}
	template <class... T> static void scan(std::tuple<T...>& v) {
		scan_tuple_impl(v);
	}

	struct Read2DVectorHelper {
		std::size_t h, w;
		Read2DVectorHelper(std::size_t _h, std::size_t _w) : h(_h), w(_w) {}
		template <class T> operator std::vector<std::vector<T>>() {
			std::vector vector(h, std::vector<T>(w));
			scan(vector);
			return vector;
		}
	};
	struct ReadVectorHelper {
		std::size_t n;
		ReadVectorHelper(std::size_t _n) : n(_n) {}
		template <class T> operator std::vector<T>() {
			std::vector<T> vector(n);
			scan(vector);
			return vector;
		}
		auto operator[](std::size_t m) {
			return Read2DVectorHelper(n, m);
		}
	};

public:
	template <class T> T read() const {
		T result;
		scan(result);
		return result;
	}
	template <class T> auto read(std::size_t n) const {
		std::vector<T> result(n);
		scan(result);
		return result;
	}
	template <class T> auto read(std::size_t h, std::size_t w) const {
		std::vector result(h, std::vector<T>(w));
		scan(result);
		return result;
	}
	std::string read_line() const {
		std::string v;
		for (char c = gc(); c != '\n' && c != '\0'; c = gc()) v += c;
		return v;
	}
	template <class T> operator T() const {
		return read<T>();
	}
	int operator--(int) const {
		return read<int>() - 1;
	}
	auto operator[](std::size_t n) const {
		return ReadVectorHelper(n);
	}
	auto operator[](const std::pair<std::size_t, std::size_t>& nm) const {
		return Read2DVectorHelper(nm.first, nm.second);
	}
	void operator()() const {}
	template <class H, class... T> void operator()(H&& h, T&&... t) const {
		scan(h);
		operator()(std::forward<T>(t)...);
	}

private:
	template <template <class...> class, class...> struct Column;
	template <template <class...> class V, class Head, class... Tail>
	struct Column<V, Head, Tail...> {
		template <class... Args> using vec = V<std::vector<Head>, Args...>;
		using type = typename Column<vec, Tail...>::type;
	};
	template <template <class...> class V> struct Column<V> { using type = V<>; };
	template <class... T> using column_t = typename Column<std::tuple, T...>::type;
	template <std::size_t N = 0, class T> void column_impl(T& t) const {
		if constexpr (N < std::tuple_size_v<T>) {
			auto& vec = std::get<N>(t);
			using V = typename std::remove_reference_t<decltype(vec)>::value_type;
			vec.push_back(read<V>());
			column_impl<N + 1>(t);
		}
	}

public:
	template <class... T> auto column(std::size_t h) const {
		column_t<T...> result;
		while (h--) column_impl(result);
		return result;
	}
} in;
#define inputs(T, ...) \
	T __VA_ARGS__;     \
	in(__VA_ARGS__)
#define ini(...) inputs(int, __VA_ARGS__)
#define inl(...) inputs(long long, __VA_ARGS__)
#define ins(...) inputs(std::string, __VA_ARGS__)
#line 5 "/home/yuruhiya/programming/library/Utility/Printer.cpp"
#include <array>
#line 7 "/home/yuruhiya/programming/library/Utility/Printer.cpp"
#include <string_view>
#include <optional>
#include <charconv>
#include <cstring>
#include <cassert>

class Printer {
public:
	struct BoolString {
		std::string_view t, f;
		BoolString(std::string_view _t, std::string_view _f) : t(_t), f(_f) {}
	};
	struct Separator {
		std::string_view div, sep, last;
		Separator(std::string_view _div, std::string_view _sep, std::string_view _last)
		    : div(_div), sep(_sep), last(_last) {}
	};

	inline static const BoolString Yes{"Yes", "No"}, yes{"yes", "no"}, YES{"YES", "NO"},
	    Int{"1", "0"}, Possible{"Possible", "Impossible"};
	inline static const Separator space{" ", " ", "\n"}, no_space{"", "", "\n"},
	    endl{"\n", "\n", "\n"}, comma{",", ",", "\n"}, no_endl{" ", " ", ""},
	    sep_endl{" ", "\n", "\n"};

	BoolString bool_str{Yes};
	Separator separator{space};

	void print(int v) const {
		char buf[12]{};
		if (auto [ptr, e] = std::to_chars(std::begin(buf), std::end(buf), v);
		    e == std::errc{}) {
			print(std::string_view(buf, ptr - buf));
		} else {
			assert(false);
		}
	}
	void print(long long v) const {
		char buf[21]{};
		if (auto [ptr, e] = std::to_chars(std::begin(buf), std::end(buf), v);
		    e == std::errc{}) {
			print(std::string_view(buf, ptr - buf));
		} else {
			assert(false);
		}
	}
	void print(bool v) const {
		print(v ? bool_str.t : bool_str.f);
	}
	void print(std::vector<bool>::reference v) const {
		print(v ? bool_str.t : bool_str.f);
	}
	void print(char v) const {
		putchar_unlocked(v);
	}
	void print(std::string_view v) const {
		fwrite_unlocked(v.data(), sizeof(std::string_view::value_type), v.size(), stdout);
	}
	void print(double v) const {
		std::printf("%.20f", v);
	}
	void print(long double v) const {
		std::printf("%.20Lf", v);
	}
	template <class T> void print(const T& v) const {
		std::cout << v;
	}
	template <class T, class U> void print(const std::pair<T, U>& v) const {
		print(v.first);
		print(separator.div);
		print(v.second);
	}
	template <class T> void print(const std::optional<T>& v) const {
		print(*v);
	}
	template <class InputIterater>
	void print_range(const InputIterater& begin, const InputIterater& end) const {
		for (InputIterater i = begin; i != end; ++i) {
			if (i != begin) print(separator.sep);
			print(*i);
		}
	}
	template <class T> void print(const std::vector<T>& v) const {
		print_range(v.begin(), v.end());
	}
	template <class T, std::size_t N> void print(const std::array<T, N>& v) const {
		print_range(v.begin(), v.end());
	}
	template <class T> void print(const std::vector<std::vector<T>>& v) const {
		for (std::size_t i = 0; i < v.size(); ++i) {
			if (i) print(separator.last);
			print(v[i]);
		}
	}

	Printer() = default;
	Printer(const BoolString& _bool_str, const Separator& _separator)
	    : bool_str(_bool_str), separator(_separator) {}
	Printer& operator()() {
		print(separator.last);
		return *this;
	}
	template <class Head> Printer& operator()(Head&& head) {
		print(head);
		print(separator.last);
		return *this;
	}
	template <class Head, class... Tail> Printer& operator()(Head&& head, Tail&&... tail) {
		print(head);
		print(separator.sep);
		return operator()(std::forward<Tail>(tail)...);
	}
	template <class... Args> Printer& flag(bool f, Args&&... args) {
		if (f) {
			return operator()(std::forward<Args>(args)...);
		} else {
			return *this;
		}
	}
	template <class InputIterator>
	Printer& range(const InputIterator& begin, const InputIterator& end) {
		print_range(begin, end);
		print(separator.last);
		return *this;
	}
	template <class Container> Printer& range(const Container& a) {
		range(a.begin(), a.end());
		return *this;
	}
	template <class... T> void exit(T&&... t) {
		operator()(std::forward<T>(t)...);
		std::exit(EXIT_SUCCESS);
	}
	Printer& flush() {
		fflush_unlocked(stdout);
		return *this;
	}
	Printer& set(const BoolString& _bool_str) {
		bool_str = _bool_str;
		return *this;
	}
	Printer& set(const Separator& _separator) {
		separator = _separator;
		return *this;
	}
	Printer& set(std::string_view t, std::string_view f) {
		bool_str = BoolString(t, f);
		return *this;
	}
} out;
#line 2 "/home/yuruhiya/programming/library/Utility/functions.cpp"
#include <algorithm>
#include <numeric>
#include <cmath>
#line 8 "/home/yuruhiya/programming/library/Utility/functions.cpp"

template <class T = long long> constexpr T TEN(std::size_t n) {
	T result = 1;
	for (std::size_t i = 0; i < n; ++i) result *= 10;
	return result;
}
template <
    class T, class U,
    std::enable_if_t<std::is_integral_v<T> && std::is_integral_v<U>, std::nullptr_t> = nullptr>
constexpr auto div_ceil(T n, U m) {
	return (n + m - 1) / m;
}
template <class T, class U> constexpr auto div_ceil2(T n, U m) {
	return div_ceil(n, m) * m;
}
template <class T> constexpr T triangle(T n) {
	return (n & 1) ? (n + 1) / 2 * n : n / 2 * (n + 1);
}
template <class T> constexpr T nC2(T n) {
	return (n & 1) ? (n - 1) / 2 * n : n / 2 * (n - 1);
}
template <class T, class U> constexpr auto middle(const T& l, const U& r) {
	return l + (r - l) / 2;
}
template <class T, class U, class V>
constexpr bool in_range(const T& v, const U& lower, const V& upper) {
	return lower <= v && v < upper;
}
template <class T, std::enable_if_t<std::is_integral_v<T>, std::nullptr_t> = nullptr>
constexpr bool is_square(T n) {
	T s = std::sqrt(n);
	return s * s == n || (s + 1) * (s + 1) == n;
}
template <class T = long long> constexpr T BIT(int b) {
	return T(1) << b;
}
template <class T> constexpr int BIT(T x, int i) {
	return (x & (T(1) << i)) ? 1 : 0;
}
template <class T> constexpr int Sgn(T x) {
	return (0 < x) - (0 > x);
}
template <class T> bool is_leap(T year) {
	return !(year % 4) && (year % 100 || !(year % 400));
}
template <class T, class U, std::enable_if_t<std::is_integral_v<U>, std::nullptr_t> = nullptr>
constexpr T Pow(T a, U n) {
	assert(n >= 0);
	T result = 1;
	while (n > 0) {
		if (n & 1) {
			result *= a;
			n--;
		} else {
			a *= a;
			n >>= 1;
		}
	}
	return result;
}
template <class T, class U, std::enable_if_t<std::is_integral_v<U>, std::nullptr_t> = nullptr>
constexpr T Powmod(T a, U n, T mod) {
	assert(n >= 0);
	if (a > mod) a %= mod;
	T result = 1;
	while (n > 0) {
		if (n & 1) {
			result = result * a % mod;
			n--;
		} else {
			a = a * a % mod;
			n >>= 1;
		}
	}
	return result;
}
template <class T> bool chmax(T& a, const T& b) {
	return a < b ? a = b, true : false;
}
template <class T> bool chmin(T& a, const T& b) {
	return a > b ? a = b, true : false;
}
template <class T> int sz(const T& v) {
	return v.size();
}
template <class T, class U> int lower_index(const T& a, const U& v) {
	return std::lower_bound(a.begin(), a.end(), v) - a.begin();
}
template <class T, class U> int upper_index(const T& a, const U& v) {
	return std::upper_bound(a.begin(), a.end(), v) - a.begin();
}
template <class T, class U = typename T::value_type> U Gcdv(const T& v) {
	return std::accumulate(std::next(v.begin()), v.end(), U(*v.begin()), std::gcd<U, U>);
}
template <class T, class U = typename T::value_type> U Lcmv(const T& v) {
	return std::accumulate(std::next(v.begin()), v.end(), U(*v.begin()), std::lcm<U, U>);
}
template <class T> T& Concat(T& v, const T& vec) {
	v.insert(v.end(), vec.begin(), vec.end());
	return v;
}
namespace internal {
	template <class T, std::size_t N>
	auto make_vector(std::vector<int>& sizes, const T& init) {
		if constexpr (N == 1) {
			return std::vector(sizes[0], init);
		} else {
			int size = sizes[N - 1];
			sizes.pop_back();
			return std::vector(size, make_vector<T, N - 1>(sizes, init));
		}
	}
}  // namespace internal
template <class T, std::size_t N>
auto make_vector(const int (&sizes)[N], const T& init = T()) {
	std::vector s(std::rbegin(sizes), std::rend(sizes));
	return internal::make_vector<T, N>(s, init);
}

namespace lambda {
	auto char_to_int = [](char c) {
		return c - '0';
	};
	auto lower_to_int = [](char c) {
		return c - 'a';
	};
	auto upper_to_int = [](char c) {
		return c - 'A';
	};
	auto int_to_char = [](int i) -> char {
		return '0' + i;
	};
	auto int_to_lower = [](int i) -> char {
		return 'a' + i;
	};
	auto int_to_upper = [](int i) -> char {
		return 'A' + i;
	};
	auto is_odd = [](auto n) {
		return n % 2 == 1;
	};
	auto is_even = [](auto n) {
		return n % 2 == 0;
	};
	auto is_positive = [](auto n) {
		return n > 0;
	};
	auto is_negative = [](auto n) {
		return n < 0;
	};
	auto increment = [](auto n) {
		return ++n;
	};
	auto decrement = [](auto n) {
		return --n;
	};
	auto self = [](const auto& n) {
		return n;
	};
	auto first = [](const auto& n) {
		return n.first;
	};
	auto second = [](const auto& n) {
		return n.second;
	};
	template <class T> auto cast() {
		return [](const auto& n) {
			return static_cast<T>(n);
		};
	};
	template <class T> auto equal_to(const T& x) {
		return [x](auto y) {
			return x == y;
		};
	}
	template <std::size_t I> auto get() {
		return [](const auto& n) {
			return std::get<I>(n);
		};
	}
	template <class F> auto cmp(F&& f) {
		return [f](const auto& a, const auto& b) {
			return f(a) < f(b);
		};
	}
}  // namespace lambda
#line 6 "/home/yuruhiya/programming/library/template_no_Ruby.cpp"
#if __has_include(<library/dump.hpp>)
#include <library/dump.hpp>
#define LOCAL
#else
#define dump(...) ((void)0)
#define dump2(...) ((void)0)
#endif
#line 2 "/home/yuruhiya/programming/library/Utility/oj_local.cpp"
template <class T> constexpr T oj_local(const T& oj, const T& local) {
#ifndef LOCAL
	return oj;
#else
	return local;
#endif
}
#line 14 "/home/yuruhiya/programming/library/template_no_Ruby.cpp"
#include <bits/stdc++.h>
#line 7 "/home/yuruhiya/programming/library/math/modint.cpp"

template <int MOD> struct modint {
	using value_type = long long;

private:
	value_type n;

public:
	constexpr static modint factorial(int n) {
		assert(n >= 0);
		modint result = 1;
		for (int i = 1; i <= n; ++i) {
			result *= i;
		}
		return result;
	}
	constexpr modint(const value_type x = 0) : n(x % MOD) {
		if (n < 0) n += MOD;
	}
	constexpr value_type value() const {
		return n;
	}
	constexpr int mod() const {
		return MOD;
	}
	constexpr modint operator+() const {
		return *this;
	}
	constexpr modint operator-() const {
		return n ? MOD - n : 0;
	}
	constexpr modint& operator++() {
		if (MOD <= ++n) n = 0;
		return *this;
	}
	constexpr modint& operator--() {
		if (n <= 0) n = MOD;
		n--;
		return *this;
	}
	constexpr modint operator++(int) {
		modint t = *this;
		++*this;
		return t;
	}
	constexpr modint operator--(int) {
		modint t = *this;
		--*this;
		return t;
	}
	constexpr modint next() const {
		return ++modint(*this);
	}
	constexpr modint pred() const {
		return --modint(*this);
	}
	constexpr modint& operator+=(const modint& m) {
		n += m.n;
		if (n >= MOD) n -= MOD;
		return *this;
	}
	constexpr modint& operator-=(const modint& m) {
		n -= m.n;
		if (n < 0) n += MOD;
		return *this;
	}
	constexpr modint& operator*=(const modint& m) {
		n = n * m.n % MOD;
		return *this;
	}
	constexpr modint& operator/=(const modint& m) {
		value_type a = m.n, b = MOD, u = 1, v = 0;
		while (b) {
			value_type t = a / b;
			a -= t * b;
			std::swap(a, b);
			u -= t * v;
			std::swap(u, v);
		}
		n = n * u % MOD;
		if (n < 0) n += MOD;
		return *this;
	}
	constexpr bool operator==(const modint& m) const {
		return n == m.n;
	}
	constexpr bool operator!=(const modint& m) const {
		return n != m.n;
	}
	template <class M> constexpr modint pow(M m) const {
		if (0 <= m) {
			modint t = n, result = 1;
			while (m > 0) {
				if (m & 1) {
					result *= t;
					m--;
				} else {
					t *= t;
					m >>= 1;
				}
			}
			return result;
		} else {
			return (modint(1) / n).pow(-m);
		}
	}
	friend constexpr modint operator+(const modint& a, const modint& b) {
		return modint(a) += b;
	}
	friend constexpr modint operator-(const modint& a, const modint& b) {
		return modint(a) -= b;
	}
	friend constexpr modint operator*(const modint& a, const modint& b) {
		return modint(a) *= b;
	}
	friend constexpr modint operator/(const modint& a, const modint& b) {
		return modint(a) /= b;
	}
	friend std::ostream& operator<<(std::ostream& os, const modint<MOD>& m) {
		return os << m.value();
	}
	friend std::istream& operator>>(std::istream& is, modint<MOD>& m) {
		modint<MOD>::value_type x;
		is >> x;
		m = modint(x);
		return is;
	}
};

using mint = modint<get_MOD()>;
using VM = std::vector<mint>;
mint operator""_m(unsigned long long n) {
	return n;
}
#line 4 "/home/yuruhiya/programming/library/math/Combination.cpp"

template <int MOD, std::size_t N> class Combination {
	using value_type = modint<MOD>;
	std::array<value_type, N + 1> fac, finv, inv;

public:
	constexpr Combination() {
		fac[0] = fac[1] = 1;
		finv[0] = finv[1] = 1;
		inv[1] = 1;
		for (std::size_t i = 2; i <= N; ++i) {
			fac[i] = fac[i - 1] * i;
			inv[i] = -inv[MOD % i] * (MOD / i);
			finv[i] = finv[i - 1] * inv[i];
		}
	}
	constexpr value_type P(int n, int r) const {
		return (n < r || n < 0 || r < 0) ? 0 : fac[n] * finv[n - r];
	}
	constexpr value_type C(int n, int r) const {
		return (n < r || n < 0 || r < 0) ? 0 : fac[n] * finv[r] * finv[n - r];
	}
	constexpr value_type H(int n, int r) const {
		return (n < 0 || r < 0) ? 0 : r == 0 ? 1 : C(n + r - 1, r);
	}
	constexpr value_type fact(int n) const {
		return fac[n];
	}
};
#line 4 "a.cpp"
using namespace std;

Combination<MOD, 2000009> C;

int main() {
	inl(n, m, d1, d2);

	ll d = d2 - d1;
	ll sum = m - d1 * (n - 1) - 1;

	mint ans = sum >= 0 ? C.C(sum + n, sum) : 0;
	FOR(x, 1, n) {
		ll sum2 = sum - (d + 1) * x;
		mint val = sum2 >= 0 ? C.C(n - 1, x) * C.C(sum2 + n, sum2) : 0;
		if (x % 2 == 1) {
			ans -= val;
		} else {
			ans += val;
		}
	}
	out(ans);
}
yukicoder

結果

テストケース

ソースコード
