QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#602195 | #9309. Graph | laurxh | WA | 115ms | 42044kb | C++14 | 1.5kb | 2024-09-30 20:54:00 | 2024-09-30 20:54:02 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=5e6+7;
const int mod=998244353;
ll n,tot,cnt,len;
int vis[N],prime[N];
ll g[N],w[N],idx1[N],idx2[N];
void seive(){
for(int i=2;i<N;i++){
if(!vis[i])prime[++tot]=i;
for(int j=1;j<=tot&&1ll*i*prime[j]<N;j++){
vis[i*prime[j]]=1;
if(i%prime[j]==0)break;
}
}
}
ll kuasum(ll a,ll b){
ll ans=1;
while(b){
if(b&1)ans=ans*a%mod;
b>>=1;
a=a*a%mod;
}
return ans;
}
ll get_id(ll x){
return (x<=len?idx1[x]:idx2[n/x]);
}
ll get(ll x){
return g[get_id(x)];
}
signed main(){
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
seive();
cin>>n;
len=sqrt(n);
for(ll l=1,r;l<=n;l=r+1){
r=n/(n/l);ll x=n/l;w[++cnt]=x;
g[cnt]=x-1;
if(w[cnt]<=len)idx1[w[cnt]]=cnt;
else idx2[n/w[cnt]]=cnt;
}
for(int i=1;i<=tot;i++){
for(int j=1;j<=cnt&&1ll*prime[i]*prime[i]<=w[j];j++){
ll x=prime[i],r=w[j]/x;
int k=get_id(r);
g[j]-=g[k]-(i-1);
}
}
ll ans=1;
for(ll l=1,r;l<=n;l=r+1){
ll x=n/l;
r=n/x;
if(x==1)continue;
ll sum=get(x)-get(x/2)+1;
ll num=sum+(x!=sum);
ll res=kuasum(x%mod,num-2);
if(x!=sum)res=res*(x-sum)%mod;
// cout<<sum<<" "<<res<<"\n";
ans=ans*kuasum(res,r-l+1)%mod;
}
cout<<ans<<"\n";
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 21ms
memory: 33364kb
input:
4
output:
8
result:
ok answer is '8'
Test #2:
score: 0
Accepted
time: 20ms
memory: 31420kb
input:
2
output:
1
result:
ok answer is '1'
Test #3:
score: 0
Accepted
time: 10ms
memory: 33508kb
input:
123
output:
671840470
result:
ok answer is '671840470'
Test #4:
score: 0
Accepted
time: 14ms
memory: 33424kb
input:
233
output:
353738465
result:
ok answer is '353738465'
Test #5:
score: 0
Accepted
time: 20ms
memory: 33432kb
input:
5981
output:
970246821
result:
ok answer is '970246821'
Test #6:
score: 0
Accepted
time: 20ms
memory: 33400kb
input:
86422
output:
897815688
result:
ok answer is '897815688'
Test #7:
score: 0
Accepted
time: 24ms
memory: 33448kb
input:
145444
output:
189843901
result:
ok answer is '189843901'
Test #8:
score: 0
Accepted
time: 16ms
memory: 31316kb
input:
901000
output:
819449452
result:
ok answer is '819449452'
Test #9:
score: 0
Accepted
time: 16ms
memory: 31320kb
input:
1000000
output:
113573943
result:
ok answer is '113573943'
Test #10:
score: 0
Accepted
time: 21ms
memory: 33332kb
input:
23333333
output:
949849384
result:
ok answer is '949849384'
Test #11:
score: 0
Accepted
time: 17ms
memory: 33436kb
input:
102850434
output:
604886751
result:
ok answer is '604886751'
Test #12:
score: 0
Accepted
time: 30ms
memory: 33796kb
input:
998244353
output:
0
result:
ok answer is '0'
Test #13:
score: 0
Accepted
time: 30ms
memory: 37764kb
input:
1000000007
output:
318420284
result:
ok answer is '318420284'
Test #14:
score: 0
Accepted
time: 40ms
memory: 37764kb
input:
2147483547
output:
688759898
result:
ok answer is '688759898'
Test #15:
score: 0
Accepted
time: 61ms
memory: 38068kb
input:
5120103302
output:
116870489
result:
ok answer is '116870489'
Test #16:
score: -100
Wrong Answer
time: 115ms
memory: 42044kb
input:
19834593299
output:
-768482857
result:
wrong answer expected '523663743', found '-768482857'