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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#579274#9309. GraphBob_WangWA 9ms26128kbC++171.7kb2024-09-21 11:20:342024-09-21 11:20:35

Judging History

你现在查看的是最新测评结果

  • [2024-09-21 11:20:35]
  • 评测
  • 测评结果:WA
  • 用时:9ms
  • 内存:26128kb
  • [2024-09-21 11:20:34]
  • 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],pre[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)
{
	if(n<M)
	return pre[n];
	tot=cnt=0;
	m=sqrt(n);
	ready(m);
	pre_solve(n);
	return g[getnum(n,n)];
}

int main()
{
	ready(M);
	for(int i=1;i<=M;++i)
	pre[i]=pre[i-1]+(1-mark[i]);
	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;
}

詳細信息

Test #1:

score: 100
Accepted
time: 5ms
memory: 20232kb

input:

4

output:

8

result:

ok answer is '8'

Test #2:

score: 0
Accepted
time: 6ms
memory: 20236kb

input:

2

output:

1

result:

ok answer is '1'

Test #3:

score: 0
Accepted
time: 9ms
memory: 20956kb

input:

123

output:

671840470

result:

ok answer is '671840470'

Test #4:

score: 0
Accepted
time: 4ms
memory: 20356kb

input:

233

output:

353738465

result:

ok answer is '353738465'

Test #5:

score: 0
Accepted
time: 6ms
memory: 20056kb

input:

5981

output:

970246821

result:

ok answer is '970246821'

Test #6:

score: 0
Accepted
time: 9ms
memory: 20464kb

input:

86422

output:

897815688

result:

ok answer is '897815688'

Test #7:

score: 0
Accepted
time: 9ms
memory: 21116kb

input:

145444

output:

189843901

result:

ok answer is '189843901'

Test #8:

score: 0
Accepted
time: 3ms
memory: 21152kb

input:

901000

output:

819449452

result:

ok answer is '819449452'

Test #9:

score: -100
Wrong Answer
time: 6ms
memory: 26128kb

input:

1000000

output:

774018453

result:

wrong answer expected '113573943', found '774018453'