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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#346555 | #8329. Excuse | ucup-team055# | AC ✓ | 526ms | 11660kb | C++20 | 3.7kb | 2024-03-08 17:41:09 | 2024-03-08 17:41:10 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll INF = LLONG_MAX / 4;
#define rep(i, a, b) for (ll i = a; i < b; i++)
#define all(a) begin(a), end(a)
// ll sz(auto a) { return size(a); }
template <class T> bool chmin(T &a, T b) {
if (a <= b)
return 0;
a = b;
return 1;
}
template <class T> bool chmax(T &a, T b) {
if (a >= b)
return 0;
a = b;
return 1;
}
struct mint {
static constexpr int m = 998244353;
int x;
mint() : x(0) {}
mint(ll x_) : x(x_ % m) {
if (x < 0)
x += m;
}
mint &operator+=(mint b) {
if ((x += b.x) >= m)
x -= m;
return *this;
}
mint &operator-=(mint b) {
if ((x -= b.x) < 0)
x += m;
return *this;
}
mint &operator*=(mint b) {
x = (ll)(x)*b.x % m;
return *this;
}
mint &operator/=(mint b) { return *this *= b.inv(); }
mint pow(ll e) const {
mint r = 1, b = *this;
while (e) {
if (e & 1)
r *= b;
b *= b;
e >>= 1;
}
return r;
}
mint inv() { return pow(m - 2); }
friend mint operator+(mint a, mint b) { return a += b; }
friend mint operator-(mint a, mint b) { return a -= b; }
friend mint operator*(mint a, mint b) { return a *= b; }
friend mint operator/(mint a, mint b) { return a /= b; }
};
using vm = vector<mint>;
void ntt(vm &a) {
int n = a.size();
vm b(n);
for (int w = n; w /= 2;) {
mint r = mint(3).pow((mint::m - 1) / n * w), t = 1;
for (int i = 0; i < n; i += w) {
int j = i * 2 & n - 1;
rep(k, 0, w) b[i + k] = a[j + k] + t * a[j + w + k];
t *= r;
}
swap(a, b);
}
}
void ntt_inv(vm &a) {
ntt(a);
reverse(a.begin() + 1, a.end());
mint i = 1 / mint(a.size());
for (mint &e : a)
e *= i;
}
struct onl_conv {
vector<mint> f, g, h, buff, bufg;
onl_conv(vector<mint> g_) : f(), g(g_), h(), buff(), bufg() {}
void add(int fl, int fr, int gl, int gr) {
const int n = fr - fl;
buff.assign(f.begin() + fl, f.begin() + fr);
buff.resize(2 * n);
ntt(buff);
if (g.size() < gr)
g.resize(gr);
bufg.assign(g.begin() + gl, g.begin() + gr);
bufg.resize(2 * n);
ntt(bufg);
rep(i, 0, 2 * n) buff[i] *= bufg[i];
ntt_inv(buff);
if (h.size() <= fl + gl + 2 * n)
h.resize(fl + gl + 2 * n);
rep(i, 0, 2 * n) h[fl + gl + i] += buff[i];
}
mint push(mint v) {
f.push_back(v);
const int i = f.size();
int tp = i, p = 0;
while (true) {
add(i - (1 << p), i, (1 << p) - 1, (1 << p + 1) - 1);
p++;
if (tp & 1)
break;
else
tp >>= 1;
}
return h[i - 1];
}
};
void solve() {
const int LIM = 1 << 18;
vector<mint> fact(LIM, 1), inv_fact(LIM, 1);
rep(i, 1, LIM) fact[i] = i * fact[i - 1];
inv_fact.back() = 1 / fact.back();
for (int i = LIM - 1; i >= 1; i--)
inv_fact[i - 1] = i * inv_fact[i];
const int N = 1 << 17;
vector<mint> g(N); // (1 - exp(-x/2))/x
const mint mi2 = 1 / mint(-2);
rep(i, 1, N) g[i - 1] = 0 - mi2.pow(i) * inv_fact[i];
// f(x/2)g(x)x+1 = f(x)
onl_conv oc(g);
vector<mint> f(N);
f[0] = 1;
rep(i, 1, N) {
mint res = oc.push(f[i - 1] / mint(2).pow(i - 1));
f[i] = res;
}
vector<mint> expf(N);
rep(i, 0, N) expf[i] = inv_fact[i];
{
f.resize(2 * N);
ntt(f);
expf.resize(2 * N);
ntt(expf);
rep(i, 0, 2 * N) f[i] *= expf[i];
ntt_inv(f);
f.resize(N);
}
int n;
cin >> n;
cout << (fact[n] * f[n] - 1).x << "\n";
}
int main() {
cin.tie(0)->sync_with_stdio(0);
ll T = 1;
// cin >> T;
while (T--)
solve();
return 0;
}
这程序好像有点Bug,我给组数据试试?
詳細信息
Test #1:
score: 100
Accepted
time: 512ms
memory: 11388kb
input:
1
output:
499122177
result:
ok 1 number(s): "499122177"
Test #2:
score: 0
Accepted
time: 519ms
memory: 11524kb
input:
3
output:
561512450
result:
ok 1 number(s): "561512450"
Test #3:
score: 0
Accepted
time: 518ms
memory: 11520kb
input:
10
output:
609769250
result:
ok 1 number(s): "609769250"
Test #4:
score: 0
Accepted
time: 517ms
memory: 11500kb
input:
1000
output:
475714976
result:
ok 1 number(s): "475714976"
Test #5:
score: 0
Accepted
time: 516ms
memory: 11524kb
input:
1024
output:
178624793
result:
ok 1 number(s): "178624793"
Test #6:
score: 0
Accepted
time: 511ms
memory: 11372kb
input:
100000
output:
537516197
result:
ok 1 number(s): "537516197"
Test #7:
score: 0
Accepted
time: 519ms
memory: 11460kb
input:
99471
output:
489775976
result:
ok 1 number(s): "489775976"
Test #8:
score: 0
Accepted
time: 526ms
memory: 11660kb
input:
65536
output:
171446457
result:
ok 1 number(s): "171446457"
Test #9:
score: 0
Accepted
time: 512ms
memory: 11360kb
input:
84792
output:
371578800
result:
ok 1 number(s): "371578800"
Test #10:
score: 0
Accepted
time: 517ms
memory: 11520kb
input:
93846
output:
841905002
result:
ok 1 number(s): "841905002"
Extra Test:
score: 0
Extra Test Passed