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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
#576087#9309. GraphLOOP0WA 17ms53148kbC++141.7kb2024-09-19 18:19:582024-09-19 18:19:58

Judging History

你现在查看的是最新测评结果

  • [2024-09-19 18:19:58]
  • 评测
  • 测评结果:WA
  • 用时:17ms
  • 内存:53148kb
  • [2024-09-19 18:19:58]
  • 提交

answer

#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=1000000;
int p1,vt,z[N+5],pr[N+5];
long long x,v[N+5],f[2][N+5],s[N+5],g[N+5];
const signed mod=998244353;
void dd(){
    p1=0;
	for(int i=2;i<=N;i++){
		if(!z[i]){
			pr[++p1]=i;
			s[p1]=p1;
		}
		for(int j=1;j<=p1&&i*pr[j]<=N;j++){
			z[i*pr[j]]=1;
			if(i%pr[j]==0) break;
		}
	}
}
void init(long long n){
	x=sqrt(n)+1;
    memset(v,0,sizeof v);
    memset(f,0,sizeof f);
    memset(s,0,sizeof s);
    memset(g,0,sizeof g);
	dd();vt=0;
	for(long long l=1,r;l<=n;l=r+1){
		r=n/(n/l);
		v[++vt]=n/l;
		if(n/l<=x) f[0][n/l]=vt;
		else f[1][l]=vt;
		long long t=n/l;
		g[vt]=t-1;
	}
	long long w;
	for(int i=1;i<=p1;i++){
		w=1ll*pr[i]*pr[i];
		long long t;
		for(int j=1;j<=vt&&w<=v[j];j++){
			t=v[j]/pr[i];
			if(t<=x) t=f[0][t];
			else t=f[1][n/t];
			g[j]-=g[t]-s[i-1];
		}
	}
	
}
long long S(long long p,int q,long long n){
	if(pr[q]>=p) return 0;
	long long td=(p<=x?f[0][p]:f[1][n/p]);
	long long re=g[td]-s[q];
	return re;
}
long long calc(long long n){
    init(n);
    return S(n,0,n);
}
long long fpow(long long a,int b){
    long long ans=1;
    while(b){
        if(b&1) ans=ans*a%mod; 
        a=a*a%mod;
        b>>=1;
    }
    return ans;
}
signed main()
{
    long long n;
    scanf("%lld",&n);
	if(n==1){
        printf("1\n");
    }
    else{
        long long cnt=calc(n)-calc(n/2)+1;
        //printf()
        long long res=n-cnt;
        //printf("cnt=%lld\n",cnt);
        if(res==0){
            printf("%lld\n",fpow(n%mod,cnt-2));
        }
        else{
            printf("%lld\n",fpow(n%mod,cnt-1)*(res%mod)%mod);
        }
    }
	return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 15ms
memory: 51772kb

input:

4

output:

8

result:

ok answer is '8'

Test #2:

score: 0
Accepted
time: 13ms
memory: 51472kb

input:

2

output:

1

result:

ok answer is '1'

Test #3:

score: -100
Wrong Answer
time: 17ms
memory: 53148kb

input:

123

output:

454824460

result:

wrong answer expected '671840470', found '454824460'