結果
| 問題 | No.802 だいたい等差数列 |
| ユーザー |
 Pachicobue
|
| 提出日時 | 2019-03-18 00:56:49 |
| 言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
| 結果 |
AC
|
| 実行時間 | 568 ms / 2,000 ms |
| コード長 | 21,481 bytes |
| コンパイル時間 | 2,127 ms |
| コンパイル使用メモリ | 212,600 KB |
| 実行使用メモリ | 179,968 KB |
| 最終ジャッジ日時 | 2024-07-08 07:53:31 |
| 合計ジャッジ時間 | 9,745 ms |
|
ジャッジサーバーID （参考情報） |
judge5 / judge1 |
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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 | 39 ms
52,992 KB |
| testcase_01 | AC | 40 ms
53,248 KB |
| testcase_02 | AC | 40 ms
53,120 KB |
| testcase_03 | AC | 2 ms
5,376 KB |
| testcase_04 | AC | 40 ms
53,120 KB |
| testcase_05 | AC | 2 ms
5,376 KB |
| testcase_06 | AC | 40 ms
53,120 KB |
| testcase_07 | AC | 40 ms
52,992 KB |
| testcase_08 | AC | 41 ms
53,120 KB |
| testcase_09 | AC | 41 ms
52,992 KB |
| testcase_10 | AC | 536 ms
170,028 KB |
| testcase_11 | AC | 568 ms
178,816 KB |
| testcase_12 | AC | 246 ms
108,672 KB |
| testcase_13 | AC | 548 ms
178,560 KB |
| testcase_14 | AC | 494 ms
158,080 KB |
| testcase_15 | AC | 245 ms
108,160 KB |
| testcase_16 | AC | 512 ms
160,384 KB |
| testcase_17 | AC | 2 ms
5,376 KB |
| testcase_18 | AC | 1 ms
5,376 KB |
| testcase_19 | AC | 253 ms
114,176 KB |
| testcase_20 | AC | 518 ms
163,456 KB |
| testcase_21 | AC | 562 ms
179,712 KB |
| testcase_22 | AC | 548 ms
179,968 KB |
| testcase_23 | AC | 102 ms
73,344 KB |
| testcase_24 | AC | 2 ms
5,376 KB |
| testcase_25 | AC | 43 ms
52,864 KB |
| testcase_26 | AC | 52 ms
59,648 KB |
| testcase_27 | AC | 48 ms
58,496 KB |
| testcase_28 | AC | 250 ms
108,672 KB |
| testcase_29 | AC | 555 ms
179,840 KB |
| testcase_30 | AC | 39 ms
52,736 KB |
| testcase_31 | AC | 38 ms
52,864 KB |
| testcase_32 | AC | 1 ms
5,376 KB |
| testcase_33 | AC | 237 ms
107,904 KB |
ソースコード
#include <bits/stdc++.h>
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wsign-conversion"
//!===========================================================!//
//! dP dP dP !//
//! 88 88 88 !//
//! 88aaaaa88a .d8888b. .d8888b. .d888b88 .d8888b. 88d888b. !//
//! 88 88 88ooood8 88' '88 88' '88 88ooood8 88' '88 !//
//! 88 88 88. ... 88. .88 88. .88 88. ... 88 !//
//! dP dP '88888P' '88888P8 '88888P8 '88888P' dP !//
//!===========================================================!//
using ld = long double;
using ll = long long;
using ull = unsigned long long;
std::mt19937 mt{std::random_device{}()};
template <typename T>
constexpr T INF = std::numeric_limits<T>::max() / 4;
template <typename T>
constexpr T MOD = static_cast<T>(1000000007);
template <typename F>
constexpr F PI() { return 3.1415926535897932385; }
#define SHOW(...) (std::cerr << "(" << #__VA_ARGS__ << ") = ("), HogeHogeSansuu(__VA_ARGS__), std::cerr << ")" << std::endl;
struct has_debugPrint_impl
{
template <class T>
static auto check(T&& x) -> decltype(x.debugPrint(), std::true_type{});
template <class T>
static auto check(...) -> std::false_type;
};
template <class T>
class has_debugPrint : public decltype(has_debugPrint_impl::check<T>(std::declval<T>()))
{
};
template <bool>
struct HogeHogeDump
{
template <typename T>
static void dump(const T& x) { x.debugPrint(); }
};
template <>
struct HogeHogeDump<false>
{
template <typename T>
static void dump(const T& x) { std::cerr << x; }
};
void HogeHogeSansuu() { ; }
template <typename T>
void HogeHogeSansuu(const T& x) { HogeHogeDump<has_debugPrint<T>::value>::dump(x); }
template <typename T, typename... Args>
void HogeHogeSansuu(const T& x, Args... args) { HogeHogeDump<has_debugPrint<T>::value>::dump(x), std::cerr << ",", HogeHogeSansuu(args...); }
template <typename T>
bool chmin(T& a, const T& b) { return a = std::min(a, b), a == b; }
template <typename T>
bool chmax(T& a, const T& b) { return a = std::max(a, b), a == b; }
template <typename T, typename F>
void For(const T s, const T t, const F f)
{
for (T i = s; i != t; i += T(s < t ? 1 : -1)) { f(i); }
}
template <typename T, typename F>
void Rep(const T N, const F f) { For<T, F>(0, N, f); }
template <typename T, typename F>
void RRep(const T N, const F f) { For<T, F>(N - 1, -1, f); }
template <typename T>
std::vector<T> Vec(const std::size_t n, T v) { return std::vector<T>(n, v); }
template <class... Args>
auto Vec(const std::size_t n, Args... args) { return std::vector<decltype(Vec(args...))>(n, Vec(args...)); }
template <typename T>
constexpr T PopCount(const T u)
{
unsigned long long v = static_cast<unsigned long long>(u);
return v = (v & 0x5555555555555555ULL) + (v >> 1 & 0x5555555555555555ULL), v = (v & 0x3333333333333333ULL) + (v >> 2 & 0x3333333333333333ULL), v = (v + (v >> 4)) & 0x0F0F0F0F0F0F0F0FULL, static_cast<T>(v * 0x0101010101010101ULL >> 56 & 0x7f);
}
template <typename T>
constexpr T log2p1(const T u)
{
unsigned long long v = static_cast<unsigned long long>(u);
return v = static_cast<unsigned long long>(v), v |= (v >> 1), v |= (v >> 2), v |= (v >> 4), v |= (v >> 8), v |= (v >> 16), v |= (v >> 32), PopCount(v);
}
template <typename T>
constexpr bool ispow2(const T v) { return (v << 1) == (T(1) << (log2p1(v))); }
template <typename T>
constexpr T ceil2(const T v) { return ispow2(v) ? v : T(1) << log2p1(v); }
template <typename T>
constexpr T floor2(const T v) { return v == 0 ? T(0) : ispow2(v) ? v : T(1) << (log2p1(v) - 1); }
template <typename T>
struct Accum
{
template <typename InIt>
Accum(const InIt first, const InIt last) : accum(std::size_t(std::distance(first, last))) { std::partial_sum(first, last, accum.begin()); }
T sum(const std::size_t i) const { return i == 0 ? T(0) : accum[i - 1]; }
T sum(const std::size_t l, const std::size_t r) const { return sum(r) - sum(l); }
std::vector<T> accum;
};
template <typename T>
struct Accum2D
{
Accum2D(const std::vector<std::vector<T>>& t) : accum{t}
{
for (std::size_t i = 0; i < accum.size(); i++) {
for (std::size_t j = 1; j < accum[i].size(); j++) { accum[i][j] += accum[i][j - 1]; }
}
for (std::size_t i = 1; i < accum.size(); i++) {
for (std::size_t j = 0; j < accum[i].size(); j++) { accum[i][j] += accum[i - 1][j]; }
}
}
T sum(const std::size_t y, const std::size_t x) const { return y == 0 or x == 0 ? T(0) : accum[y - 1][x - 1]; }
T sum(const std::size_t ymin, const std::size_t ysup, const std::size_t xmin, const std::size_t xsup) const { return sum(ysup, xsup) - sum(ymin, xmin); }
std::vector<std::vector<T>> accum;
};
template <typename T>
struct Zip
{
template <typename InIt>
Zip(const InIt first, const InIt last) : unzip(std::size_t(std::distance(first, last)))
{
std::copy(first, last, unzip), std::sort(unzip.begin(), unzip.end()), unzip.erase(std::unique(unzip.begin(), unzip.end()), unzip.end());
for (std::size_t i = 0; i < unzip.size(); i++) { zip[unzip[i]] = i; }
}
std::vector<T> unzip;
std::map<T, std::size_t> zip;
};
template <typename T, std::size_t N>
std::ostream& operator<<(std::ostream& os, const std::array<T, N>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
template <typename T, typename A>
std::ostream& operator<<(std::ostream& os, const std::deque<T, A>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
template <typename K, typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::multimap<K, T, C, A>& v)
{
os << "[";
for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
return (os << "]" << std::endl);
}
template <typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::multiset<T, C, A>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
template <typename K, typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::map<K, T, C, A>& v)
{
os << "[";
for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
return (os << "]" << std::endl);
}
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, const std::pair<T1, T2>& v) { return (os << "<" << v.first << "," << v.second << ">"); }
template <typename T1, typename T2, typename T3>
std::ostream& operator<<(std::ostream& os, const std::priority_queue<T1, T2, T3>& v)
{
auto q = v;
os << "[";
while (not q.empty()) { os << q.top() << ",", q.pop(); }
return os << "]\n";
}
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, const std::queue<T1>& v)
{
auto q = v;
os << "[";
while (not q.empty()) { os << q.front() << ",", q.pop(); }
return os << "]\n";
}
template <typename T, typename C, typename A>
std::ostream& operator<<(std::ostream& os, const std::set<T, C, A>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, const std::stack<T1>& v)
{
auto q = v;
os << "[";
while (not q.empty()) { os << q.top() << ",", q.pop(); }
return os << "]\n";
}
template <typename K, typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_multimap<K, T, H, P, A>& v)
{
os << "[";
for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
return (os << "]" << std::endl);
}
template <typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_multiset<T, H, P, A>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
template <typename K, typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_map<K, T, H, P, A>& v)
{
os << "[";
for (const auto& e : v) { os << "<" << e.first << ": " << e.second << ">,"; }
return (os << "]" << std::endl);
}
template <typename T, typename H, typename P, typename A>
std::ostream& operator<<(std::ostream& os, const std::unordered_set<T, H, P, A>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
template <typename T, typename A>
std::ostream& operator<<(std::ostream& os, const std::vector<T, A>& v)
{
os << "[";
for (const auto& e : v) { os << e << ","; }
return (os << "]" << std::endl);
}
//!===============================================================!//
//! 88888888b dP .88888. a88888b. 888888ba !//
//! 88 88 d8' '88 d8' '88 88 '8b !//
//! a88aaaa dP. .dP d8888P 88 88 88 88 !//
//! 88 '8bd8' 88 88 YP88 88 88 88 !//
//! 88 .d88b. 88 Y8. .88 Y8. .88 88 .8P !//
//! 88888888P dP' 'dP dP '88888' Y88888P' 8888888P !//
//!===============================================================!//
template <typename T>
constexpr std::pair<T, T> extgcd(const T a, const T b)
{
if (b == 0) { return std::pair<T, T>{1, 0}; }
const auto p = extgcd(b, a % b);
return {p.second, p.first - p.second * (a / b)};
}
template <typename T>
constexpr T inverse(const T a, const T mod) { return (mod + extgcd((mod + a % mod) % mod, mod).first % mod) % mod; }
//!========================================================!//
//! 8888ba.88ba dP dP dP !//
//! 88 '8b '8b 88 88 88 !//
//! 88 88 88 .d8888b. .d888b88 88 88d888b. d8888P !//
//! 88 88 88 88' '88 88' '88 88 88' '88 88 !//
//! 88 88 88 88. .88 88. .88 88 88 88 88 !//
//! dP dP dP '88888P' '88888P8 dP dP dP dP !//
//!========================================================!//
template <typename T, T mod>
class ModInt
{
private:
T value;
public:
ModInt() : value{0} {}
ModInt(const T val) : value{((val % mod) + mod) % mod} {}
ModInt(const ModInt<T, mod>& n) : value{n()} {}
ModInt<T, mod>& operator=(const ModInt<T, mod>& n) { return value = n(), (*this); }
ModInt<T, mod>& operator=(const T v) { return value = (mod + v % mod) % mod, (*this); }
ModInt<T, mod> operator+() const { return *this; }
ModInt<T, mod> operator-() const { return ModInt{mod - value}; }
ModInt<T, mod> operator+(const ModInt<T, mod>& val) const { return ModInt{value + val()}; }
ModInt<T, mod> operator-(const ModInt<T, mod>& val) const { return ModInt{value - val() + mod}; }
ModInt<T, mod> operator*(const ModInt<T, mod>& val) const { return ModInt{value * val()}; }
ModInt<T, mod> operator/(const ModInt<T, mod>& val) const { return ModInt{value * inverse(val(), mod)}; }
ModInt<T, mod>& operator+=(const ModInt<T, mod>& val) { return (((value += val()) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod>& operator-=(const ModInt<T, mod>& val) { return (((value -= val()) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod>& operator*=(const ModInt<T, mod>& val) { return (((value *= val()) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod>& operator/=(const ModInt<T, mod>& val) { return (((value *= inverse(val(), mod)) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod> operator+(const T val) const { return ModInt{value + val}; }
ModInt<T, mod> operator-(const T val) const { return ModInt{value - val}; }
ModInt<T, mod> operator*(const T val) const { return ModInt{value * val}; }
ModInt<T, mod> operator/(const T val) const { return ModInt{value * inverse(val, mod)}; }
template <typename I>
ModInt<T, mod> operator^(const I n) const { return n < 0 ? (T(1) / (*this)) ^ (-n) : n == 0 ? ModInt<T, mod>(1) : n % 2 == 1 ? (*this) * ((*this) ^ (n - 1)) : ((*this * *this) ^ (n / 2)); }
ModInt<T, mod>& operator+=(const T val) { return (((value += val) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod>& operator-=(const T val) { return (((value -= val) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod>& operator*=(const T val) { return (((value *= val) %= mod) += mod) %= mod, (*this); }
ModInt<T, mod>& operator/=(const T val) { return (((value *= inverse(val, mod)) %= mod) += mod) %= mod, (*this); }
template <typename I>
ModInt<T, mod>& operator^=(const I n) { return (*this) = ((*this) ^ n); }
bool operator==(const ModInt<T, mod>& val) const { return value == val.value; }
bool operator!=(const ModInt<T, mod>& val) const { return not(*this == val); }
bool operator==(const T val) const { return value == (mod + val % mod) % mod; }
bool operator!=(const T val) const { return not(*this == val); }
T operator()() const { return value; }
};
template <typename T, T mod>
inline ModInt<T, mod> operator+(const T val, const ModInt<T, mod>& n) { return ModInt<T, mod>{n() + val}; }
template <typename T, T mod>
inline ModInt<T, mod> operator-(const T val, const ModInt<T, mod>& n) { return ModInt<T, mod>{-n() + val}; }
template <typename T, T mod>
inline ModInt<T, mod> operator*(const T val, const ModInt<T, mod>& n) { return ModInt<T, mod>{n() * val}; }
template <typename T, T mod>
inline ModInt<T, mod> operator/(const T val, const ModInt<T, mod>& n) { return ModInt<T, mod>(val) / n; }
template <typename T, T mod>
inline bool operator==(const T val, const ModInt<T, mod>& n) { return n == val; }
template <typename T, T mod>
inline bool operator!=(const T val, const ModInt<T, mod>& n) { return not(val == n); }
template <typename T, T mod>
inline std::istream& operator>>(std::istream& is, ModInt<T, mod>& n)
{
T v;
return is >> v, n = v, is;
}
template <typename T, T mod>
std::ostream& operator<<(std::ostream& os, const ModInt<T, mod>& n) { return (os << n()); }
template <int mod>
using Mint = ModInt<int, mod>;
template <ll mod>
using Mll = ModInt<ll, mod>;
//!============================================================================!//
//! 8888ba.88ba dP a88888b. dP !//
//! 88 '8b '8b 88 d8' '88 88 !//
//! 88 88 88 .d8888b. .d888b88 88 .d8888b. 88d8b.d8b. 88d888b. !//
//! 88 88 88 88' '88 88' '88 88 88' '88 88''88''88 88' '88 !//
//! 88 88 88 88. .88 88. .88 Y8. .88 88. .88 88 88 88 88. .88 !//
//! dP dP dP '88888P' '88888P8 Y88888P' '88888P' dP dP dP 88Y8888' !//
//!============================================================================!//
template <typename T, T mod>
class ModComb
{
public:
ModComb(const std::size_t N) : f(N + 1, ModInt<T, mod>(1)), in(N + 1, ModInt<T, mod>(1)), invf(N + 1, ModInt<T, mod>(1))
{
for (T i = 2; i <= (T)N; i++) { f[i] = f[i - 1] * i, in[i] = (mod - (mod / i)) * in[mod % i], invf[i] = invf[i - 1] * in[i]; }
}
ModInt<T, mod> fact(const std::size_t N) const { return f[N]; }
ModInt<T, mod> inv(const std::size_t N) const { return in[N]; }
ModInt<T, mod> invFact(const std::size_t N) const { return invf[N]; }
ModInt<T, mod> perm(const std::size_t N, const std::size_t K) const { return f[N] * invf[N - K]; }
ModInt<T, mod> comb(const std::size_t N, const std::size_t K) const { return f[N] * invf[K] * invf[N - K]; }
private:
std::vector<ModInt<T, mod>> f, in, invf;
};
//!==================================!//
//! 88888888b 88888888b d888888P !//
//! 88 88 88 !//
//! a88aaaa a88aaaa 88 !//
//! 88 88 88 !//
//! 88 88 88 !//
//! dP dP dP !//
//!==================================!//
struct C
{
using F = double;
F x{}, y{};
C operator+(const C& c) const { return C{x + c.x, y + c.y}; }
C operator-(const C& c) const { return C{x - c.x, y - c.y}; }
C operator*(const C& c) const { return C{x * c.x - y * c.y, x * c.y + y * c.x}; }
C operator~() const { return C{x, -y}; }
};
constexpr std::size_t L = 21;
C roots[1 << L] = {{0, 0}, {1, 0}};
std::size_t rev[1 << L] = {0, 1};
C fa[1 << L], fb[1 << L];
template <typename F = double, std::size_t L = 20>
class FFT
{
private:
void fft(C* a, const std::size_t n) const
{
const std::size_t shift = L - n;
for (std::size_t i = 0; i < (1UL << n); i++) {
if (i < (rev[i] >> shift)) { std::swap(a[i], a[rev[i] >> shift]); }
}
for (std::size_t k = 1; k < (1UL << n); k <<= 1) {
for (std::size_t i = 0; i < (1UL << n); i += (2 * k)) {
for (std::size_t j = 0; j < k; j++) {
const C z = a[i + j + k] * roots[j + k];
a[i + j + k] = a[i + j] - z, a[i + j] = a[i + j] + z;
}
}
}
}
static std::size_t LG(const std::size_t n)
{
std::size_t lg = 0;
for (std::size_t ans = 1; ans < n; ans <<= 1, lg++) {}
return lg;
}
public:
FFT()
{
for (std::size_t i = 0; i < (1 << L); i++) { rev[i] = (rev[i >> 1] >> 1) + ((i & 1) << (L - 1)); }
for (std::size_t k = 1; k < L; k++) {
const F s = 2 * PI<F>() / (1 << (k + 1));
for (std::size_t i = 1UL << (k - 1); i < (1UL << k); i++) { roots[i << 1] = roots[i], roots[i << 1 | 1] = roots[i << 1] * C{std::cos(s), std::sin(s)}; }
}
}
template <typename T = ll, typename O = int>
std::vector<T> convolute(const std::vector<O>& a, const std::vector<O>& b)
{
const std::size_t need = a.size() + b.size() - 1, lg = LG(need), sz = 1 << lg;
for (std::size_t i = 0; i < sz; i++) { fa[i] = C{F(i < a.size() ? a[i] : 0), F(i < b.size() ? b[i] : 0)}; }
fft(fa, lg);
const C r{0, -0.25 / (F)sz};
for (std::size_t i = 0; i <= (sz >> 1); i++) {
std::size_t j = (sz - i) & (sz - 1);
const C z = (fa[j] * fa[j] - ~(fa[i] * fa[i])) * r;
fa[j] = (fa[i] * fa[i] - ~(fa[j] * fa[j])) * r, fa[i] = z;
}
fft(fa, lg);
std::vector<T> ans(need);
for (std::size_t i = 0; i < need; i++) { ans[i] = (T)std::floor(fa[i].x + 0.5); }
return ans;
}
template <typename T = int, typename O = int>
std::vector<T> convolute(const std::vector<O>& a, const std::vector<O>& b, const T mod)
{
const std::size_t need = a.size() + b.size() - 1, lg = LG(need), sz = 1 << lg;
for (std::size_t i = 0; i < a.size(); i++) {
const T x = (mod + a[i] % mod) % mod;
fa[i] = C{(F)(x & ((1 << 15) - 1)), F(x >> 15)};
}
std::fill(fa + a.size(), fa + sz, C{0, 0});
fft(fa, lg);
for (std::size_t i = 0; i < b.size(); i++) {
const T x = (mod + b[i] % mod) % mod;
fb[i] = C{F(x & ((1 << 15) - 1)), F(x >> 15)};
}
std::fill(fb + b.size(), fb + sz, C{0, 0});
fft(fb, lg);
F ratio = 0.25 / F(sz);
C r2{0, -1}, r3{ratio, 0}, r4{0, -ratio}, r5{0, 1};
for (std::size_t i = 0; i <= (sz >> 1); i++) {
const std::size_t j = (sz - i) & (sz - 1);
const C a1 = (fa[i] + ~fa[j]), a2 = (fa[i] - ~fa[j]) * r2, b1 = (fb[i] + ~fb[j]) * r3, b2 = (fb[i] - ~fb[j]) * r4;
if (i != j) {
const C c1 = (fa[j] + ~fa[i]), c2 = (fa[j] - ~fa[i]) * r2, d1 = (fb[j] + ~fb[i]) * r3, d2 = (fb[j] - ~fb[i]) * r4;
fa[i] = c1 * d1 + c2 * d2 * r5, fb[i] = c1 * d2 + c2 * d1;
}
fa[j] = a1 * b1 + a2 * b2 * r5, fb[j] = a1 * b2 + a2 * b1;
}
fft(fa, lg), fft(fb, lg);
std::vector<T> ans(need);
for (std::size_t i = 0; i < need; i++) {
const T aa = (T)std::floor(fa[i].x + 0.5), bb = (T)std::floor(fb[i].x + 0.5), cc = (T)std::floor(fa[i].y + 0.5);
ans[i] = (T)(aa + ((bb % mod) << 15) + ((cc % mod) << 30)) % mod;
}
return ans;
}
};
//!============================================!//
//! 8888ba.88ba oo !//
//! 88 '8b '8b !//
//! 88 88 88 .d8888b. dP 88d888b. !//
//! 88 88 88 88' '88 88 88' '88 !//
//! 88 88 88 88. .88 88 88 88 !//
//! dP dP dP '88888P8 dP dP dP !//
//!============================================!//
int main()
{
ll N, M, D1, D2;
std::cin >> N >> M >> D1 >> D2;
const ll D = D2 - D1, L = M - D1 * (N - 1) - 1;
if (L < 0) { return std::cout << 0 << std::endl, 0; }
ModComb<ll, MOD<ll>> mod(L + N);
std::vector<ll> a(L + 1), b(L + 1);
for (int i = 0; i * (D + 1) <= L and i < N; i++) { a[i * (D + 1)] = (mod.comb(N - 1, i) * (i % 2 == 0 ? 1 : -1))(); }
for (int i = 0; i <= L; i++) { b[i] = mod.comb(i + N - 2, N - 2)(); }
FFT<double, 21> fft;
auto c = fft.convolute(a, b, MOD<ll>);
c.resize(L + 1);
ll sum = 0;
for (ll i = 0; i <= L; i++) { (sum += (L - i + 1) * c[i] % MOD<ll>) %= MOD<ll>; }
std::cout << sum << std::endl;
return 0;
}