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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#579269#9309. GraphBob_WangTL 2435ms20816kbC++171.6kb2024-09-21 11:16:392024-09-21 11:16:39

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你现在查看的是最新测评结果

  • [2024-09-21 11:16:39]
  • 评测
  • 测评结果:TL
  • 用时:2435ms
  • 内存:20816kb
  • [2024-09-21 11:16:39]
  • 提交

answer

#include<cstdio>
#include<cmath>
#define ll long long
#define maxn 1000005
using namespace std;

const int M=1000000;
const ll mod=998244353;
ll n,m;
ll tot,prime[maxn],mark[maxn];
ll cnt,id1[maxn],id2[maxn];//将区间映射到连续的数组
ll g[maxn],v[maxn];

ll mul(ll x,ll y)
{
	if(y<0)
	return 1;
	x%=mod;
	ll ret=1;
	while(y)
	{
		if(y&1)
		ret=ret*x%mod;
		x=x*x%mod;
		y>>=1;
	}
	return ret;
}

void ready(ll m)
{
	for(int i=2;i<=m;++i)
	{
		if(!mark[i])
		prime[++tot]=i;
		for(int j=1;j<=tot;++j)
		{
			ll x=i*prime[j];
			if(x>M)
			break;
			mark[x]=1;
			if(i%prime[j]==0)
			break;
		}
	}
}

ll getnum(ll n,ll x)
{
	return (x<=m)?id1[x]:id2[n/x];
}

ll f(ll x)//求f(x)
{
	if(x==1)
	return 0;
	else
	return 1;
}

ll sumf(ll x)//求f(2)+...+f(x)的和
{
	return x-1;
}

void pre_solve(ll n)//预处理g数组
{
	for(ll l=1,r;l<=n;l=r+1)
	{
		r=n/(n/l);
		ll val=n/l;
		if(val<=m)
		id1[val]=++cnt;
		else id2[n/val]=++cnt;
		v[cnt]=val;
		g[cnt]=sumf(val);
	}
	for(ll j=1;j<=tot;++j)
	{
		ll x=prime[j];
		for(ll i=1;i<=cnt&&x*x<=v[i];++i)
		g[i]-=g[getnum(n,v[i]/x)]-(j-1);
	}
}

ll getprime(ll n)
{
	tot=cnt=0;
	m=sqrt(n);
	ready(m);
	pre_solve(n);
	return g[getnum(n,n)];
}

int main()
{
	scanf("%lld",&n);
	ll ans=1;
	for(ll l=1,r;l<=n;l=r+1)
	{
		r=n/(n/l);
		ll cnt=n/l,tot_p=(getprime(cnt)-getprime(cnt>>1))%mod;
		ll del;
		if(cnt>3)
		del=(cnt-tot_p-1)%mod*mul(cnt,tot_p)%mod;
		else del=mul(cnt,cnt-2);
		ans=ans*mul(del,r-l+1)%mod;
	}
	printf("%lld",ans);
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 2ms
memory: 12188kb

input:

4

output:

8

result:

ok answer is '8'

Test #2:

score: 0
Accepted
time: 1ms
memory: 10156kb

input:

2

output:

1

result:

ok answer is '1'

Test #3:

score: 0
Accepted
time: 2ms
memory: 12292kb

input:

123

output:

671840470

result:

ok answer is '671840470'

Test #4:

score: 0
Accepted
time: 0ms
memory: 12312kb

input:

233

output:

353738465

result:

ok answer is '353738465'

Test #5:

score: 0
Accepted
time: 2ms
memory: 12140kb

input:

5981

output:

970246821

result:

ok answer is '970246821'

Test #6:

score: 0
Accepted
time: 0ms
memory: 12304kb

input:

86422

output:

897815688

result:

ok answer is '897815688'

Test #7:

score: 0
Accepted
time: 4ms
memory: 14340kb

input:

145444

output:

189843901

result:

ok answer is '189843901'

Test #8:

score: 0
Accepted
time: 10ms
memory: 18400kb

input:

901000

output:

819449452

result:

ok answer is '819449452'

Test #9:

score: 0
Accepted
time: 7ms
memory: 18392kb

input:

1000000

output:

113573943

result:

ok answer is '113573943'

Test #10:

score: 0
Accepted
time: 103ms
memory: 18512kb

input:

23333333

output:

949849384

result:

ok answer is '949849384'

Test #11:

score: 0
Accepted
time: 367ms
memory: 20536kb

input:

102850434

output:

604886751

result:

ok answer is '604886751'

Test #12:

score: 0
Accepted
time: 2422ms
memory: 20816kb

input:

998244353

output:

0

result:

ok answer is '0'

Test #13:

score: 0
Accepted
time: 2435ms
memory: 18800kb

input:

1000000007

output:

318420284

result:

ok answer is '318420284'

Test #14:

score: -100
Time Limit Exceeded

input:

2147483547

output:


result: