結果
| 問題 |
No.2272 多項式乗算 mod 258280327
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-04-17 13:30:49 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,245 ms / 2,000 ms |
| コード長 | 2,460 bytes |
| コンパイル時間 | 2,620 ms |
| コンパイル使用メモリ | 210,532 KB |
| 最終ジャッジ日時 | 2025-02-12 09:29:46 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 33 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#ifdef _RUTHEN
#include <debug.hpp>
#else
#define show(...) true
#endif
#define REP(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;
constexpr int P = 258280327;
V<long long> convolution(V<long long> &a, V<long long> &b, const int n) {
assert(a.size() == b.size());
if (n <= 120) {
V<long long> c(n + n - 1);
REP(i, n) REP(j, n) c[i + j] += a[i] * b[j];
REP(i, n + n - 1) c[i] %= P;
return c;
}
const int n0 = (n + 1) / 2;
const int n1 = n - n0;
V<long long> a0(n0), a1(n1), b0(n0), b1(n1);
copy(a.begin(), a.begin() + n0, a0.begin());
copy(b.begin(), b.begin() + n0, b0.begin());
copy(a.begin() + n0, a.end(), a1.begin());
copy(b.begin() + n0, b.end(), b1.begin());
V<long long> a01(n0), b01(n0);
copy(a.begin(), a.begin() + n0, a01.begin());
copy(b.begin(), b.begin() + n0, b01.begin());
REP(i, n1) {
a01[i] += a1[i];
b01[i] += b1[i];
if (a01[i] >= P) a01[i] -= P;
if (b01[i] >= P) b01[i] -= P;
}
auto c0 = convolution(a0, b0, n0);
auto c1 = convolution(a1, b1, n1);
auto c2 = convolution(a01, b01, n0);
V<long long> c(n0 + n0 + n0 + n0 - 1);
REP(i, n0 + n0 - 1) {
c[i] += c0[i];
c[i + n0] += c2[i] - c0[i];
}
REP(i, n1 + n1 - 1) {
c[i + n0] -= c1[i];
c[i + n0 + n0] += c1[i];
}
REP(i, n0 + n0 + n0 + n0 - 1) {
c[i] %= P;
if (c[i] < 0) c[i] += P;
}
return c;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int N;
cin >> N;
N++;
V<long long> a(N);
REP(i, N) cin >> a[i];
int M;
cin >> M;
M++;
V<long long> b(M);
REP(i, M) cin >> b[i];
if (N == 1 and a[0] == 0) {
cout << 0 << '\n';
cout << 0 << '\n';
return 0;
}
if (M == 1 and b[0] == 0) {
cout << 0 << '\n';
cout << 0 << '\n';
return 0;
}
REP(i, N) a[i] %= P;
REP(i, M) b[i] %= P;
int K = max(N, M);
while (a.size() < K) a.push_back(0);
while (b.size() < K) b.push_back(0);
auto c = convolution(a, b, (int)a.size());
while (c.size() > N + M - 1) c.pop_back();
cout << c.size() - 1 << '\n';
REP(i, c.size()) cout << c[i] << " \n"[i + 1 == c.size()];
return 0;
}