# competitive-programming-library

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# modulus/number_theoretic_transformation.yosupo.test.cpp

## Code

#include "modulus/number_theoretic_transformation.hpp"
#define PROBLEM "https://judge.yosupo.jp/problem/convolution_mod"

#include <vector>
#include "utils/macros.hpp"
#include "hack/fastio.hpp"

constexpr int MOD = 998244353;
int main() {
// input
int n = in<uint32_t>();
int m = in<uint32_t>();
std::vector<mint<MOD> > a(n);
REP (i, n) {
a[i].value = in<uint32_t>();
}
std::vector<mint<MOD> > b(m);
REP (j, m) {
b[j].value = in<uint32_t>();
}

// solve
std::vector<mint<MOD> > c = ntt_convolution(a, b);

// output
REP (i, n + m - 1) {
out<uint32_t>(c[i].value);
out<char>(' ');
}
out<char>('\n');
return 0;
}



#line 2 "modulus/number_theoretic_transformation.hpp"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <tuple>
#include <vector>
#line 3 "modulus/mint.hpp"
#include <iostream>
#line 4 "modulus/modpow.hpp"

inline int32_t modpow(uint_fast64_t x, uint64_t k, int32_t MOD) {
assert (/* 0 <= x and */ x < (uint_fast64_t)MOD);
uint_fast64_t y = 1;
for (; k; k >>= 1) {
if (k & 1) (y *= x) %= MOD;
(x *= x) %= MOD;
}
assert (/* 0 <= y and */ y < (uint_fast64_t)MOD);
return y;
}
#line 5 "modulus/modinv.hpp"

inline int32_t modinv_nocheck(int32_t value, int32_t MOD) {
assert (0 <= value and value < MOD);
if (value == 0) return -1;
int64_t a = value, b = MOD;
int64_t x = 0, y = 1;
for (int64_t u = 1, v = 0; a; ) {
int64_t q = b / a;
x -= q * u; std::swap(x, u);
y -= q * v; std::swap(y, v);
b -= q * a; std::swap(b, a);
}
if (not (value * x + MOD * y == b and b == 1)) return -1;
if (x < 0) x += MOD;
assert (0 <= x and x < MOD);
return x;
}

inline int32_t modinv(int32_t x, int32_t MOD) {
int32_t y = modinv_nocheck(x, MOD);
assert (y != -1);
return y;
}
#line 6 "modulus/mint.hpp"

/**
* @brief quotient ring / 剰余環 $\mathbb{Z}/n\mathbb{Z}$
*/
template <int32_t MOD>
struct mint {
int32_t value;
mint() : value() {}
mint(int64_t value_) : value(value_ < 0 ? value_ % MOD + MOD : value_ >= MOD ? value_ % MOD : value_) {}
mint(int32_t value_, std::nullptr_t) : value(value_) {}
explicit operator bool() const { return value; }
inline mint<MOD> operator + (mint<MOD> other) const { return mint<MOD>(*this) += other; }
inline mint<MOD> operator - (mint<MOD> other) const { return mint<MOD>(*this) -= other; }
inline mint<MOD> operator * (mint<MOD> other) const { return mint<MOD>(*this) *= other; }
inline mint<MOD> & operator += (mint<MOD> other) { this->value += other.value; if (this->value >= MOD) this->value -= MOD; return *this; }
inline mint<MOD> & operator -= (mint<MOD> other) { this->value -= other.value; if (this->value <    0) this->value += MOD; return *this; }
inline mint<MOD> & operator *= (mint<MOD> other) { this->value = (uint_fast64_t)this->value * other.value % MOD; return *this; }
inline mint<MOD> operator - () const { return mint<MOD>(this->value ? MOD - this->value : 0, nullptr); }
inline bool operator == (mint<MOD> other) const { return value == other.value; }
inline bool operator != (mint<MOD> other) const { return value != other.value; }
inline mint<MOD> pow(uint64_t k) const { return mint<MOD>(modpow(value, k, MOD), nullptr); }
inline mint<MOD> inv() const { return mint<MOD>(modinv(value, MOD), nullptr); }
inline mint<MOD> operator / (mint<MOD> other) const { return *this * other.inv(); }
inline mint<MOD> & operator /= (mint<MOD> other) { return *this *= other.inv(); }
};
template <int32_t MOD> mint<MOD> operator + (int64_t value, mint<MOD> n) { return mint<MOD>(value) + n; }
template <int32_t MOD> mint<MOD> operator - (int64_t value, mint<MOD> n) { return mint<MOD>(value) - n; }
template <int32_t MOD> mint<MOD> operator * (int64_t value, mint<MOD> n) { return mint<MOD>(value) * n; }
template <int32_t MOD> mint<MOD> operator / (int64_t value, mint<MOD> n) { return mint<MOD>(value) / n; }
template <int32_t MOD> std::istream & operator >> (std::istream & in, mint<MOD> & n) { int64_t value; in >> value; n = value; return in; }
template <int32_t MOD> std::ostream & operator << (std::ostream & out, mint<MOD> n) { return out << n.value; }
#line 2 "utils/macros.hpp"
#define REP(i, n) for (int i = 0; (i) < (int)(n); ++ (i))
#define REP3(i, m, n) for (int i = (m); (i) < (int)(n); ++ (i))
#define REP_R(i, n) for (int i = (int)(n) - 1; (i) >= 0; -- (i))
#define REP3R(i, m, n) for (int i = (int)(n) - 1; (i) >= (int)(m); -- (i))
#define ALL(x) std::begin(x), std::end(x)
#line 9 "modulus/number_theoretic_transformation.hpp"

template <int32_t PRIME> struct proth_prime {};
template <> struct proth_prime<1224736769> { static constexpr int a =             73, b = 24, g =  3; };
template <> struct proth_prime<1053818881> { static constexpr int a =     3 * 5 * 67, b = 20, g =  7; };
template <> struct proth_prime<1051721729> { static constexpr int a =        17 * 59, b = 20, g =  6; };
template <> struct proth_prime<1045430273> { static constexpr int a =            997, b = 20, g =  3; };
template <> struct proth_prime<1012924417> { static constexpr int a =     3 * 7 * 23, b = 21, g =  5; };
template <> struct proth_prime<1007681537> { static constexpr int a =        31 * 31, b = 20, g =  3; };
template <> struct proth_prime<1004535809> { static constexpr int a =            479, b = 21, g =  3; };
template <> struct proth_prime< 998244353> { static constexpr int a =         7 * 17, b = 23, g =  3; };
template <> struct proth_prime< 985661441> { static constexpr int a =         5 * 47, b = 22, g =  3; };
template <> struct proth_prime< 976224257> { static constexpr int a =     7 * 7 * 19, b = 20, g =  3; };
template <> struct proth_prime< 975175681> { static constexpr int a =     3 * 5 * 31, b = 21, g = 17; };
template <> struct proth_prime< 962592769> { static constexpr int a = 3 * 3 * 3 * 17, b = 21, g =  7; };
template <> struct proth_prime< 950009857> { static constexpr int a =        4 * 151, b = 21, g =  7; };
template <> struct proth_prime< 943718401> { static constexpr int a =  3 * 3 * 5 * 5, b = 22, g =  7; };
template <> struct proth_prime< 935329793> { static constexpr int a =            223, b = 22, g =  3; };
template <> struct proth_prime< 924844033> { static constexpr int a =  3 * 3 * 7 * 7, b = 21, g =  5; };
template <> struct proth_prime< 469762049> { static constexpr int a =              7, b = 26, g =  3; };
template <> struct proth_prime< 167772161> { static constexpr int a =              5, b = 25, g =  3; };

struct is_proth_prime_impl {
template <int32_t PRIME, class T> static auto check(T *) -> decltype(proth_prime<PRIME>::g, std::true_type());
template <int32_t PRIME, class T> static auto check(...) -> std::false_type;
};
template <int32_t PRIME>
struct is_proth_prime : decltype(is_proth_prime_impl::check<PRIME, std::nullptr_t>(nullptr)) {
};

/**
* @brief Number Theoretic Transformation (NTT) for Proth primes
* @note O(N log N)
* @note radix-2, decimation-in-frequency, Cooley-Tukey
* @note cache std::polar (~ 2x faster)
*/
template <int32_t PRIME>
void ntt_inplace(std::vector<mint<PRIME> > & a, bool inverse) {
const int n = a.size();
const int log2_n = __builtin_ctz(n);
assert (n == 1 << log2_n);
assert (log2_n <= proth_prime<PRIME>::b);

// prepare rotors
std::vector<mint<PRIME> > ep, iep;
while ((int)ep.size() <= log2_n) {
ep.push_back(mint<PRIME>(proth_prime<PRIME>::g).pow(mint<PRIME>(-1).value / (1 << ep.size())));
iep.push_back(ep.back().inv());
}

// divide and conquer
std::vector<mint<PRIME> > b(n);
REP3 (i, 1, log2_n + 1) {
int w = 1 << (log2_n - i);
mint<PRIME> base = (inverse ? iep : ep)[i];
mint<PRIME> now = 1;
for (int y = 0; y < n / 2; y += w) {
REP (x, w) {
auto l = a[y << 1 | x];
auto r = now * a[y << 1 | x | w];
b[y | x] = l + r;
b[y | x | n >> 1] = l - r;
}
now *= base;
}
std::swap(a, b);
}

// div by n if inverse
if (inverse) {
auto n_inv = mint<PRIME>(n).inv();
REP (i, n) {
a[i] *= n_inv;
}
}
}

/**
* @brief multiprecation on $\mathbb{F}_p[x]$ for Proth primes
* @note O(N log N)
* @note (f \ast g)(i) = \sum_{0 \le j \lt i + 1} f(j) g(i - j)
*/
template <int32_t PRIME>
typename std::enable_if<is_proth_prime<PRIME>::value, std::vector<mint<PRIME> > >::type ntt_convolution(const std::vector<mint<PRIME> > & a_, const std::vector<mint<PRIME> > & b_) {
if (a_.size() <= 32 or b_.size() <= 32) {
std::vector<mint<PRIME> > c(a_.size() + b_.size() - 1);
REP (i, a_.size()) REP (j, b_.size()) c[i + j] += a_[i] * b_[j];
return c;
}
int m = a_.size() + b_.size() - 1;
int n = (m == 1 ? 1 : 1 << (32 - __builtin_clz(m - 1)));
auto a = a_;
auto b = b_;
a.resize(n);
b.resize(n);
ntt_inplace(a, false);
ntt_inplace(b, false);
REP (i, n) {
a[i] *= b[i];
}
ntt_inplace(a, true);
a.resize(m);
return a;
}
#line 2 "modulus/number_theoretic_transformation.yosupo.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/convolution_mod"

#line 3 "hack/fastio.hpp"
#include <cstdio>
#include <string>
#include <type_traits>

template <class Char, std::enable_if_t<std::is_same_v<Char, char>, int> = 0>
inline Char in() { return getchar_unlocked(); }
template <class String, std::enable_if_t<std::is_same_v<String, std::string>, int> = 0>
inline std::string in() {
char c; do { c = getchar_unlocked(); } while (isspace(c));
std::string s;
do { s.push_back(c); } while (not isspace(c = getchar_unlocked()));
return s;
}
template <class Integer, std::enable_if_t<std::is_integral_v<Integer> and not std::is_same_v<Integer, char>, int> = 0>
inline Integer in() {
char c; do { c = getchar_unlocked(); } while (isspace(c));
if (std::is_signed<Integer>::value and c == '-') return -in<Integer>();
Integer n = 0;
do { n = n * 10 + c - '0'; } while (not isspace(c = getchar_unlocked()));
return n;
}

template <class Char, std::enable_if_t<std::is_same_v<Char, char>, int> = 0>
inline void out(char c) { putchar_unlocked(c); }
template <class String, std::enable_if_t<std::is_same_v<String, std::string>, int> = 0>
inline void out(const std::string & s) { for (char c : s) putchar_unlocked(c); }
template <class Integer, std::enable_if_t<std::is_integral_v<Integer>, int> = 0>
inline void out(Integer n) {
char s[20];
int i = 0;
if (std::is_signed<Integer>::value and n < 0) { putchar_unlocked('-'); n *= -1; }
do { s[i ++] = n % 10; n /= 10; } while (n);
while (i) putchar_unlocked(s[-- i] + '0');
}
#line 7 "modulus/number_theoretic_transformation.yosupo.test.cpp"

constexpr int MOD = 998244353;
int main() {
// input
int n = in<uint32_t>();
int m = in<uint32_t>();
std::vector<mint<MOD> > a(n);
REP (i, n) {
a[i].value = in<uint32_t>();
}
std::vector<mint<MOD> > b(m);
REP (j, m) {
b[j].value = in<uint32_t>();
}

// solve
std::vector<mint<MOD> > c = ntt_convolution(a, b);

// output
REP (i, n + m - 1) {
out<uint32_t>(c[i].value);
out<char>(' ');
}
out<char>('\n');
return 0;
}