Blog of RuSun

\begin {array}{c} \mathfrak {One Problem Is Difficult} \\\\ \mathfrak {Because You Don't Know} \\\\ \mathfrak {Why It Is Diffucult} \end {array}

P5264 多项式三角函数

P5264 多项式三角函数

欧拉公式
$$
e ^ {ix} = cos(x) + i \cdot sin(x)
$$

解得:
$$
\begin {cases}
sin(x) = \frac {e ^ {ix} - e ^ {-ix}} {2i} \\
cos(x) = \frac {e ^ {ix} + e ^ {-ix}} {2}
\end {cases}
$$

$i$ 的取值,因为 $ i ^ 4 = 1 = g ^ {p - 1} $ ,所以 $i = g ^ {\frac {p - 1} 4}$ 。

查看代码
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#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long LL;
const int N = 4e5 + 10, ini = 86583718;
const LL mod = 998244353;
LL A[N];
int n, k, rev[N];
LL binpow(LL b, int k)
{
LL res = 1;
while (k)
{
if (k & 1)
res = res * b % mod;
b = b * b % mod;
k >>= 1;
}
return res;
}
void PolyRev(int bit)
{
for (int i = 1; i < (1 << bit); i++)
rev[i] = (rev[i >> 1] >> 1) | ((i & 1) << (bit - 1));
}
void NTT(LL *x, int bit, int op)
{
PolyRev(bit);
int tot = 1 << bit;
for (int i = 0; i < tot; i++)
if (rev[i] < i)
swap(x[i], x[rev[i]]);
for (int mid = 1; mid < tot; mid <<= 1)
{
LL w1 = binpow(3, (mod - 1) / (mid << 1));
if (op == -1)
w1 = binpow(w1, mod - 2);
for (int i = 0; i < tot; i += (mid << 1))
{
LL cur = 1;
for (int j = 0; j < mid; j++, cur = cur * w1 % mod)
{
LL p = x[i + j], q = cur * x[i + j + mid] % mod;
x[i + j] = (p + q) % mod, x[i + j + mid] = (p - q + mod) % mod;
}
}
}
if (op == -1)
{
LL intot = binpow(tot, mod - 2);
for (int i = 0; i < tot; i++)
x[i] = x[i] * intot % mod;
}
}
void PolyInv(LL *x, LL *g, int len)
{
if (len == 1)
{
g[0] = binpow(x[0], mod - 2);
return;
}
int bit = 0;
while ((1 << bit) < (len << 1))
bit++;
int tot = 1 << bit;
PolyInv(x, g, len + 1 >> 1);
static LL c[N];
for (int i = (len + 1 >> 1); i < tot; i++)
g[i] = 0;
for (int i = 0; i < tot; i++)
c[i] = (i < len ? x[i] : 0);
NTT(g, bit, 1);
NTT(c, bit, 1);
for (int i = 0; i < tot; i++)
g[i] = (2 - g[i] * c[i] % mod + mod) % mod * g[i] % mod;
NTT(g, bit, -1);
for (int i = len; i < tot; i++)
g[i] = 0;
}
void PolyDerivate(LL *x, LL *g, int len)
{
for (int i = 1; i < len; i++)
g[i - 1] = x[i] * i % mod;
g[len - 1] = 0;
}
void PolyIntegrate(LL *x, LL *g, int len)
{
for (int i = 1; i < len; i++)
g[i] = x[i - 1] * binpow(i, mod - 2) % mod;
g[0] = 0;
}
void PolyLn(LL *x, LL *g, int len)
{
static LL c[N], d[N];
PolyDerivate(x, c, len);
PolyInv(x, d, len);
int bit = 0;
while ((1 << bit) < (len << 1))
bit++;
int tot = 1 << bit;
for (int i = len; i < tot; i++)
c[i] = d[i] = 0;
NTT(c, bit, 1);
NTT(d, bit, 1);
for (int i = 0; i < tot; i++)
c[i] = c[i] * d[i] % mod;
NTT(c, bit, -1);
for (int i = len; i < tot; i++)
c[i] = 0;
PolyIntegrate(c, g, len);
for (int i = len; i < tot; i++)
g[i] = 0;
}
void PolyExp(LL *x, LL *g, int len)
{
if (len == 1)
{
g[0] = 1;
return;
}
int bit = 0;
while ((1 << bit) < (len << 1))
bit++;
int tot = 1 << bit;
PolyExp(x, g, len + 1 >> 1);
static LL c[N];
for (int i = 0; i < tot; i++)
c[i] = 0;
PolyLn(g, c, len);
for (int i = 0; i < len; i++)
c[i] = (x[i] - c[i] + mod) % mod;
for (int i = len; i < tot; i++)
c[i] = 0;
c[0]++;
NTT(g, bit, 1);
NTT(c, bit, 1);
for (int i = 0; i < tot; i++)
g[i] = g[i] * c[i] % mod;
NTT(g, bit, -1);
for (int i = len; i < tot; i++)
g[i] = 0;
}
void PolyBinpow(LL *x, LL *g, int k, int len)
{
static LL c[N];
PolyLn(x, c, len);
for (int i = 0; i < n; i++)
c[i] = c[i] * k;
PolyExp(c, g, len);
}
void PolySqrt(LL *x, LL *g, int len)
{
PolyBinpow(x, g, mod + 1 >> 1, len);
}
void PolySin(LL *x, LL *g, int len)
{
static LL c[N], d[N], e[N];
int bit = 0;
while ((1 << bit) < (len << 1))
bit++;
int tot = 1 << bit;
for (int i = 0; i < tot; i++)
c[i] = i < len ? x[i] * ini % mod : 0;
PolyExp(c, d, len);
for (int i = 0; i < tot; i++)
c[i] = i < len ? mod - x[i] * ini % mod : 0;
PolyExp(c, e, len);
LL in2i = binpow(2 * ini % mod, mod - 2);
for (int i = 0; i < len; i++)
g[i] = (d[i] - e[i] + mod) % mod * in2i % mod;
}
void PolyCos(LL *x, LL *g, int len)
{
static LL c[N], d[N], e[N];
int bit = 0;
while ((1 << bit) < (len << 1))
bit++;
int tot = 1 << bit;
for (int i = 0; i < tot; i++)
c[i] = i < len ? x[i] * ini % mod : 0;
PolyExp(c, d, len);
for (int i = 0; i < len; i++)
c[i] = i < len ? mod - x[i] * ini % mod : 0;
PolyExp(c, e, len);
LL in2 = mod + 1 >> 1;
for (int i = 0; i < len; i++)
g[i] = (d[i] + e[i]) % mod * in2 % mod;
}
int main()
{
int op;
scanf("%d%d", &n, &op);
for (int i = 0; i < n; i++)
scanf("%lld", &A[i]);
static LL res[N];
op ? PolyCos(A, res, n) : PolySin(A, res, n);
for (int i = 0; i < n; i++)
printf("%lld ", res[i]);
return 0;
}