QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#566696 | #9309. Graph | 2016gdgzoi471 | WA | 38ms | 15288kb | C++14 | 1.5kb | 2024-09-16 01:13:55 | 2024-09-16 01:13:55 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long long ll;
const int N=1000005;
ll n,w[N],g[N];
int sq,tot,m,p[N],id1[N],id2[N];
bool vis[N];
void init(){
sq=sqrt(n);
for(int i=2;i<=sq;i++){
if(!vis[i]){
p[++tot]=i;
}
for(int j=1;j<=tot&&i*p[j]<=sq;j++){
vis[i*p[j]]=true;
if(i%p[j]==0){
break;
}
}
}
for(ll i=1,nxt;i<=n;i=nxt+1){
nxt=n/(n/i);
w[++m]=n/i;
if(w[m]<=sq){
id1[w[m]]=m;
}else{
id2[n/w[m]]=m;
}
g[m]=w[m]-1;
}
for(int j=1;j<=tot;j++){
ll sqr=1LL*p[j]*p[j];
for(int i=1;i<=m&&w[i]>=sqr;i++){
ll tmp=w[i]/p[j];
tmp=tmp<=sq?id1[tmp]:id2[n/tmp];
g[i]-=g[tmp]-j+1;
}
}
}
const int mod=998244353;
int fastpow(int a,ll x){
int res=1;
while(x){
if(x&1){
res=1LL*res*a%mod;
}
x>>=1;
a=1LL*a*a%mod;
}
return res;
}
int P(ll x){
return x<=sq?g[id1[x]]:g[id2[n/x]];
}
ll F(ll x){
return P(n/x)-P(n/x/2)+1;
}
int main(){
scanf("%lld",&n);
if(n<=2){
puts("1");
return 0;
}
init();
int ans=1;
for(ll i=1,j,nxt;i<=n;i=nxt+1){
j=n/i,nxt=n/j;
ll vf=F(i);
// printf("%lld %lld\n",i,vf);
if(vf==j){
if(j>1){
ans=1LL*ans*fastpow(fastpow(j,j-2),nxt-i+1)%mod;
}
}else{
ans=1LL*ans*fastpow(1LL*fastpow(j,vf-1)*(j-vf)%mod,nxt-i+1)%mod;
}
// printf("%lld\n",ans);
}
printf("%d\n",ans);
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 10056kb
input:
4
output:
8
result:
ok answer is '8'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3748kb
input:
2
output:
1
result:
ok answer is '1'
Test #3:
score: 0
Accepted
time: 2ms
memory: 11996kb
input:
123
output:
671840470
result:
ok answer is '671840470'
Test #4:
score: 0
Accepted
time: 0ms
memory: 10080kb
input:
233
output:
353738465
result:
ok answer is '353738465'
Test #5:
score: 0
Accepted
time: 2ms
memory: 9956kb
input:
5981
output:
970246821
result:
ok answer is '970246821'
Test #6:
score: 0
Accepted
time: 2ms
memory: 9956kb
input:
86422
output:
897815688
result:
ok answer is '897815688'
Test #7:
score: 0
Accepted
time: 0ms
memory: 10024kb
input:
145444
output:
189843901
result:
ok answer is '189843901'
Test #8:
score: 0
Accepted
time: 0ms
memory: 12140kb
input:
901000
output:
819449452
result:
ok answer is '819449452'
Test #9:
score: 0
Accepted
time: 2ms
memory: 12012kb
input:
1000000
output:
113573943
result:
ok answer is '113573943'
Test #10:
score: 0
Accepted
time: 3ms
memory: 10096kb
input:
23333333
output:
949849384
result:
ok answer is '949849384'
Test #11:
score: 0
Accepted
time: 5ms
memory: 12228kb
input:
102850434
output:
604886751
result:
ok answer is '604886751'
Test #12:
score: 0
Accepted
time: 12ms
memory: 14644kb
input:
998244353
output:
0
result:
ok answer is '0'
Test #13:
score: 0
Accepted
time: 12ms
memory: 14700kb
input:
1000000007
output:
318420284
result:
ok answer is '318420284'
Test #14:
score: 0
Accepted
time: 20ms
memory: 14608kb
input:
2147483547
output:
688759898
result:
ok answer is '688759898'
Test #15:
score: -100
Wrong Answer
time: 38ms
memory: 15288kb
input:
5120103302
output:
384994873
result:
wrong answer expected '116870489', found '384994873'