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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 |
---|---|---|---|---|---|---|---|---|---|
#570381 | #9309. Graph | tarjen | WA | 44ms | 56708kb | C++20 | 2.9kb | 2024-09-17 15:33:26 | 2024-09-17 15:33:29 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
//??????? n^1/3 ?????????n^2/3???????????
const int N = 1e7;
const int M = 2; //?????????????
const int PM = 2 * 3 * 5; //???????????????????17
ll n;
bool np[N];
int prime[N], pi[N];
int phi[PM + 1][M + 1], sz[M + 1];
int getprime() {
int cnt = 0;
np[0] = np[1] = true;
pi[0] = pi[1] = 0;
for (int i = 2; i < N; ++i) {
if (!np[i]) prime[++cnt] = i;
pi[i] = cnt;
for (int j = 1; j <= cnt && i * prime[j] < N; ++j) {
np[i * prime[j]] = true;
if (i % prime[j] == 0) break;
}
}
return cnt;
}
void init() {
getprime();
sz[0] = 1;
for (int i = 0; i <= PM; ++i) phi[i][0] = i;
for (int i = 1; i <= M; ++i) {
sz[i] = prime[i] * sz[i - 1];
for (int j = 1; j <= PM; ++j) phi[j][i] = phi[j][i - 1] - phi[j / prime[i]][i - 1];
}
}
int sqrt2(ll x) {
ll r = (ll)sqrt(x - 0.1);
while (r * r <= x) ++r;
return int(r - 1);
}
int sqrt3(ll x) {
ll r = (ll)cbrt(x - 0.1);
while (r * r * r <= x) ++r;
return int(r - 1);
}
ll getphi(ll x, int s) {
if (s == 0) return x;
if (s <= M) return phi[x % sz[s]][s] + (x / sz[s]) * phi[sz[s]][s];
if (x <= prime[s] * prime[s]) return pi[x] - s + 1;
if (x <= prime[s] * prime[s] * prime[s] && x < N) {
int s2x = pi[sqrt2(x)];
ll ans = pi[x] - (s2x + s - 2) * (s2x - s + 1) / 2;
for (int i = s + 1; i <= s2x; ++i) ans += pi[x / prime[i]];
return ans;
}
return getphi(x, s - 1) - getphi(x / prime[s], s - 1);
}
ll getpi(ll x) {
if (x < N) return pi[x];
ll ans = getphi(x, pi[sqrt3(x)]) + pi[sqrt3(x)] - 1;
for (int i = pi[sqrt3(x)] + 1, ed = pi[sqrt2(x)]; i <= ed; ++i) ans -= getpi(x / prime[i]) - i + 1;
return ans;
}
ll lehmer_pi(ll x) { //????n???????
if (x < N) return pi[x];
int a = (int)lehmer_pi(sqrt2(sqrt2(x)));
int b = (int)lehmer_pi(sqrt2(x));
int c = (int)lehmer_pi(sqrt3(x));
ll sum = getphi(x, a) + (ll)(b + a - 2) * (b - a + 1) / 2;
for (int i = a + 1; i <= b; i++) {
ll w = x / prime[i];
sum -= lehmer_pi(w);
if (i > c) continue;
ll lim = lehmer_pi(sqrt2(w));
for (int j = i; j <= lim; j++) sum -= lehmer_pi(w / prime[j]) - (j - 1);
}
return sum;
}
const ll mod =998244353;
ll ksm(ll x,ll k){
ll res=1;
while(k){
if(k&1)res=res*x%mod;
x=x*x%mod;
k/=2;
}
return res;
}
int main()
{
init();
ll n;cin>>n;
ll ans=1;
auto solve = [&](ll n){
ll res=1;
if(n==1)return res;
ll p=lehmer_pi(n)-lehmer_pi(n/2)+1;
assert(p>=2);
if(n-p>0)res=ksm(n,p+1-2);
else res=ksm(n,p-2);
if(n-p>0)res=res*(n-p)%mod;
return res;
};
for(ll l=1,r;l<=n;l=r+1){
r=min(n/(n/l),n);
ll x=n/l;
ans=ans*ksm(solve(x),r-l+1);
}
cout<<ans;
}
詳細信息
Test #1:
score: 100
Accepted
time: 35ms
memory: 56668kb
input:
4
output:
8
result:
ok answer is '8'
Test #2:
score: 0
Accepted
time: 44ms
memory: 56708kb
input:
2
output:
1
result:
ok answer is '1'
Test #3:
score: -100
Wrong Answer
time: 34ms
memory: 56708kb
input:
123
output:
0
result:
wrong answer expected '671840470', found '0'