test/yosupo/bitwise_xor_convolution.test.cpp

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Last update: 2024-01-08 17:31:43+09:00
Problem: https://judge.yosupo.jp/problem/bitwise_xor_convolution

Depends on

Code

#define PROBLEM "https://judge.yosupo.jp/problem/bitwise_xor_convolution"

#include <bits/stdc++.h>

#include "../../math/modint.hpp"
#include "../../convolution/xor_convolution.hpp"
using namespace std;
using ll = long long;

using mint = Modint<998244353>;

int main() {
    int N;
    cin >> N;
    vector<mint> a(1 << N), b(1 << N);
    for (auto& x : a) cin >> x;
    for (auto& x : b) cin >> x;
    auto c = xor_convolution(a, b);
    for (int i = 0; i < (1 << N); ++i)
        cout << c[i] << (i < (1 << N) - 1 ? " " : "\n");
}

#line 1 "test/yosupo/bitwise_xor_convolution.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/bitwise_xor_convolution"

#include <bits/stdc++.h>

#line 4 "math/modint.hpp"

/**
 * @brief Mod int
 */
template <int m>
class Modint {
    using mint = Modint;
    static_assert(m > 0, "Modulus must be positive");

   public:
    static constexpr int mod() { return m; }

    constexpr Modint(long long y = 0) : x(y >= 0 ? y % m : (y % m + m) % m) {}

    constexpr int val() const { return x; }

    constexpr mint& operator+=(const mint& r) {
        if ((x += r.x) >= m) x -= m;
        return *this;
    }
    constexpr mint& operator-=(const mint& r) {
        if ((x += m - r.x) >= m) x -= m;
        return *this;
    }
    constexpr mint& operator*=(const mint& r) {
        x = static_cast<int>(1LL * x * r.x % m);
        return *this;
    }
    constexpr mint& operator/=(const mint& r) { return *this *= r.inv(); }

    constexpr bool operator==(const mint& r) const { return x == r.x; }

    constexpr mint operator+() const { return *this; }
    constexpr mint operator-() const { return mint(-x); }

    constexpr friend mint operator+(const mint& l, const mint& r) {
        return mint(l) += r;
    }
    constexpr friend mint operator-(const mint& l, const mint& r) {
        return mint(l) -= r;
    }
    constexpr friend mint operator*(const mint& l, const mint& r) {
        return mint(l) *= r;
    }
    constexpr friend mint operator/(const mint& l, const mint& r) {
        return mint(l) /= r;
    }

    constexpr mint inv() const {
        int a = x, b = m, u = 1, v = 0;
        while (b > 0) {
            int t = a / b;
            std::swap(a -= t * b, b);
            std::swap(u -= t * v, v);
        }
        return mint(u);
    }

    constexpr mint pow(long long n) const {
        mint ret(1), mul(x);
        while (n > 0) {
            if (n & 1) ret *= mul;
            mul *= mul;
            n >>= 1;
        }
        return ret;
    }

    friend std::ostream& operator<<(std::ostream& os, const mint& r) {
        return os << r.x;
    }

    friend std::istream& operator>>(std::istream& is, mint& r) {
        long long t;
        is >> t;
        r = mint(t);
        return is;
    }

   private:
    int x;
};
#line 2 "convolution/xor_convolution.hpp"
#include <bit>
#line 4 "convolution/xor_convolution.hpp"

#line 5 "convolution/walsh_hadamard_transform.hpp"

template <typename T>
void fwht(std::vector<T>& a) {
    assert(std::has_single_bit(a.size()));
    const int n = a.size();
    for (int h = 1; h < n; h <<= 1) {
        for (int i = 0; i < n; i += h << 1) {
            for (int j = i; j < i + h; ++j) {
                T x = a[j], y = a[j | h];
                a[j] = x + y;
                a[j | h] = x - y;
            }
        }
    }
}

template <typename T>
void ifwht(std::vector<T>& a) {
    assert(std::has_single_bit(a.size()));
    const int n = a.size();
    const T inv2 = T(1) / 2;
    for (int h = 1; h < n; h <<= 1) {
        for (int i = 0; i < n; i += h << 1) {
            for (int j = i; j < i + h; ++j) {
                T x = a[j], y = a[j | h];
                a[j] = (x + y) * inv2;
                a[j | h] = (x - y) * inv2;
            }
        }
    }
}
#line 6 "convolution/xor_convolution.hpp"

/**
 * @brief Bitwise XOR Convolution
 */

template <typename T>
std::vector<T> xor_convolution(std::vector<T> a, std::vector<T> b) {
    const int n = std::bit_ceil(std::max(a.size(), b.size()));
    a.resize(n);
    b.resize(n);
    fwht(a);
    fwht(b);
    for (int i = 0; i < n; ++i) a[i] *= b[i];
    ifwht(a);
    return a;
}
#line 7 "test/yosupo/bitwise_xor_convolution.test.cpp"
using namespace std;
using ll = long long;

using mint = Modint<998244353>;

int main() {
    int N;
    cin >> N;
    vector<mint> a(1 << N), b(1 << N);
    for (auto& x : a) cin >> x;
    for (auto& x : b) cin >> x;
    auto c = xor_convolution(a, b);
    for (int i = 0; i < (1 << N); ++i)
        cout << c[i] << (i < (1 << N) - 1 ? " " : "\n");
}