QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#649616 | #9309. Graph | fosov | RE | 95ms | 14480kb | C++14 | 3.0kb | 2024-10-18 03:36:02 | 2024-10-18 03:36:04 |
Judging History
answer
#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define INF 0x3f3f3f3f
#define LNF 0x3f3f3f3f3f3f3f3fll
#define MOD 998244353
#define pii pair<int, int>
template<int M>
struct modint {
int val;
modint(): val(0) {};
modint(ll val): val(val % M) {};
modint operator+(modint o) {
return modint(((ll) val + o.val) % M);
}
modint operator-(modint o) {
return modint(((ll) val - o.val + M) % M);
}
modint operator*(modint o) {
return modint((ll) val * o.val % M);
}
modint operator/(modint o) {
return *this * o.pow(M-2);
}
modint pow(ll p) {
modint b = *this, c = modint(1);
for (; p; b=b*b, p>>=1) if (p&1) c=c*b;
return c;
}
};
template<int M>
ostream& operator<<(ostream& os, const modint<M>& s) {
return os << s.val;
}
#define mint modint<MOD>
struct min25 {
static const int N = 1000010;
ll n, m, s;
ll bk[N], g[N];
int pc, p[N], ip[N];
static ll isqrt(ll x) {
ll l = 1, r = x;
while (l < r) {
ll m = (l + r) >> 1;
if (m * m < x) {
l = m + 1;
} else {
r = m;
}
}
return r - (r * r > x);
}
void linear_sieve(int x) {
pc = p[0] = 1;
for (int i = 1; i < x; ++ i) ip[i] = 1;
for (int i = 2; i < x; ++ i) {
if (ip[i]) p[pc ++] = i;
for (int j = 1; j < pc && (ll) i * p[j] < x; ++ j) {
ip[i * p[j]] = 0;
if (i % p[j] == 0) break;
}
}
}
int get_id(ll x) {
return x <= s ? x - 1 : m - n / x;
}
void init(ll n) {
this->n = n;
m = 0;
s = isqrt(n);
linear_sieve(s + 1);
for (int i = 1; i <= s; ++ i) bk[m ++] = i;
for (int i = s; i >= 1; -- i) if (n / i > s) bk[m ++] = n / i;
for (int i = 0; i < m; ++ i) g[i] = bk[i] - 1;
for (int i = 1, bi = 0; i < pc; ++ i) {
while (1ll * p[i] * p[i] > bk[bi]) ++ bi;
for (int j = m-1; j >= bi; -- j) {
g[j] = g[j] - 1ll * (g[get_id(bk[j] / p[i])] - g[get_id(p[i-1])]);
}
}
}
int cnt_prime(ll x) {
if (x == 0) return 0;
assert(bk[get_id(x)] == x);
return g[get_id(x)];
}
} sieve;
int main() {
#ifdef TEST
freopen("zz.in", "r+", stdin);
#endif
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
ll n; cin >> n;
sieve.init(n);
ll l = 1;
mint res = mint(1);
while (l <= n) {
ll r = n / (n / l);
ll m = n / l;
int np = sieve.cnt_prime(m) - sieve.cnt_prime(m / 2);
int k = 1 + np + (m - 1 - np != 0);
mint mu = mint(max(m - 1 - np, 1ll));
mint cur = mu * mint(m).pow(max(0, k - 2));
res = res * cur.pow(r - l + 1);
l = r+1;
}
cout << res << '\n';
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 9732kb
input:
4
output:
8
result:
ok answer is '8'
Test #2:
score: 0
Accepted
time: 1ms
memory: 9872kb
input:
2
output:
1
result:
ok answer is '1'
Test #3:
score: 0
Accepted
time: 1ms
memory: 9728kb
input:
123
output:
671840470
result:
ok answer is '671840470'
Test #4:
score: 0
Accepted
time: 1ms
memory: 9852kb
input:
233
output:
353738465
result:
ok answer is '353738465'
Test #5:
score: 0
Accepted
time: 0ms
memory: 9744kb
input:
5981
output:
970246821
result:
ok answer is '970246821'
Test #6:
score: 0
Accepted
time: 0ms
memory: 9812kb
input:
86422
output:
897815688
result:
ok answer is '897815688'
Test #7:
score: 0
Accepted
time: 1ms
memory: 9812kb
input:
145444
output:
189843901
result:
ok answer is '189843901'
Test #8:
score: 0
Accepted
time: 1ms
memory: 9820kb
input:
901000
output:
819449452
result:
ok answer is '819449452'
Test #9:
score: 0
Accepted
time: 1ms
memory: 9748kb
input:
1000000
output:
113573943
result:
ok answer is '113573943'
Test #10:
score: 0
Accepted
time: 2ms
memory: 9852kb
input:
23333333
output:
949849384
result:
ok answer is '949849384'
Test #11:
score: 0
Accepted
time: 4ms
memory: 9968kb
input:
102850434
output:
604886751
result:
ok answer is '604886751'
Test #12:
score: 0
Accepted
time: 11ms
memory: 12308kb
input:
998244353
output:
0
result:
ok answer is '0'
Test #13:
score: 0
Accepted
time: 11ms
memory: 10356kb
input:
1000000007
output:
318420284
result:
ok answer is '318420284'
Test #14:
score: 0
Accepted
time: 24ms
memory: 14076kb
input:
2147483547
output:
688759898
result:
ok answer is '688759898'
Test #15:
score: 0
Accepted
time: 42ms
memory: 12896kb
input:
5120103302
output:
116870489
result:
ok answer is '116870489'
Test #16:
score: 0
Accepted
time: 95ms
memory: 14480kb
input:
19834593299
output:
523663743
result:
ok answer is '523663743'
Test #17:
score: -100
Runtime Error
input:
52500109238