QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#669021#9309. GraphFolityWA 2ms13784kbC++201.1kb2024-10-23 17:02:222024-10-23 17:02:26

Judging History

你现在查看的是最新测评结果

  • [2024-10-23 17:02:26]
  • 评测
  • 测评结果:WA
  • 用时:2ms
  • 内存:13784kb
  • [2024-10-23 17:02:22]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

const int N=5e5+3,mod=998244353;
int cnt=0;
ll pri[N];
bool np[N];
void sieve(int n){
	np[1]=1;
	for(int i=2;i<=n;++i){
		if(!np[i])pri[++cnt]=i;
		for(int j=1;j<=cnt&&i*pri[j]<=n;++j){
			np[i*pri[j]]=1;
			if(!(i%pri[j]))break;
		}
	}
}

int tot=0;
ll n,q,buc[N*2],g[N*2],i1[N],i2[N];
inline ll S(ll x){
	return x<=q?g[i1[x]]:g[i2[n/x]];
}

ll qpow(ll x,ll y){
    x%=mod,y%=mod-1;
    ll r=1;
    for(;y;y>>=1){
        if(y&1)r=r*x%mod;
        x=x*x%mod;
    }
    return r;
}

int main(){
	cin>>n;
	q=sqrt(n);
	sieve(q);
	for(ll i=1,j;i<=n;i=j+1){
		j=n/(n/i);
		buc[++tot]=n/i;
        g[tot]=buc[tot]-1;
		if(n/i<=q)i1[n/i]=tot;
		else i2[n/(n/i)]=tot;
	}
	for(int i=1;i<=cnt;++i)
		for(int j=1;j<=tot&&pri[i]*pri[i]<=buc[j];++j){
			ll t=buc[j]/pri[i];
			ll k=t<=q?i1[t]:i2[n/t];
            g[j]-=g[k]-i+1;
		}
    ll ans=1,w,t;
    for(ll i=1,j,m;i<=n/3;i=j+1){
        m=n/i,j=n/m;
        w=S(m)-S(m/2)+2;
        t=(m-w+1)%mod*qpow(m,w-2)%mod;
        ans=ans*qpow(t,j-i+1)%mod;
    }
    cout<<ans<<'\n';
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 11692kb

input:

4

output:

8

result:

ok answer is '8'

Test #2:

score: 0
Accepted
time: 2ms
memory: 11844kb

input:

2

output:

1

result:

ok answer is '1'

Test #3:

score: -100
Wrong Answer
time: 0ms
memory: 13784kb

input:

123

output:

0

result:

wrong answer expected '671840470', found '0'