QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#570104 | #9309. Graph | jeffqi | RE | 2ms | 4792kb | C++17 | 2.5kb | 2024-09-17 13:50:26 | 2024-09-17 13:50:33 |
Judging History
answer
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/hash_policy.hpp>
#define ll long long
#define all(v) v.begin(),v.end()
#define sz(v) ((ll)v.size())
#define V vector
#define vi V<int>
#define vll V<ll>
#define eb emplace_back
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
#define A array
#define pb push_back
#define mset multiset
#define gpumap __gnu_pbds::gp_hash_table
#define ccumap __gnu_pbds::cc_hash_table
#define ui unsigned int
#define ull unsigned ll
#define i128 __int128
#define cerr if (test) cerr
#define freopen if (test) freopen
#define whtest if (test)
using namespace std;
const int test = 0;
namespace jhsy {
constexpr int P = 998244353,N = 1e6;
vi p;
void init(const int n = N) {
A<bool,N+1> isp; isp.fill(1);
for (int i = 2; i <= n; i++) {
if (isp[i]) {
p.eb(i);
}
for (auto x:p) {
if (i*x > n) {
break;
}
isp[i*x] = 0;
if (!(i%x)) {
break;
}
}
}
}
ll power(ll b,ll k) {
ll a = 1;
b = (b%P+P)%P;
k = (k%(P-1)+(P-1))%(P-1);
for (; k; b = b*b%P, k >>= 1) {
if (k&1) {
a = a*b%P;
}
}
return a;
}
void main() {
ll n;
cin >> n;
ll ans = 1;
const ll B = sqrt(1.L*n+1);
vll mp(B*2);
auto id = [&](ll x) {
return x <= B ? x : B+n/x;
};
{
vll vec;
for (ll lst = 0,cur; lst < n; lst = cur) {
ll k = n/(lst+1); cur = n/k;
vec.eb(cur);
assert(id(cur) < sz(mp));
}
reverse(all(vec));
for (auto x:vec) {
mp[id(x)] = x-1;
}
for (int k = 0; k < sz(p); k++) {
ll t = 1ll*p[k]*p[k];
if (t > n) {
break;
}
for (auto x:vec) {
if (t > x) {
break;
}
mp[id(x)] -= mp[id(x/p[k])]-k;
}
}
}
auto get = [&](ll x) {
ll res = mp[id(x)]-mp[id(x/2)];
if (x/2 < 2 && x >= 2) {
res--;
}
return res;
};
auto calc = [&](ll x) -> ll {
if (x == 1) {
return 1;
}
ll p = get(x)+1,q = x-p;
return q%P*power(p+q,p-1)%P;
};
for (ll lst = 0,cur; lst < n; lst = cur) {
ll k = n/(lst+1); cur = n/k;
ans = ans*power(calc(k),cur-lst)%P;
}
cout << ans << '\n';
}
}
int main() {
freopen("test.in", "r", stdin);
freopen("test.out", "w", stdout);
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << fixed << setprecision(20);
jhsy::init();
int T = 1;
// cin >> T;
while (T--) {
jhsy::main();
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 2ms
memory: 4792kb
input:
4
output:
8
result:
ok answer is '8'
Test #2:
score: -100
Runtime Error
input:
2