QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#521850#7046. Function!QF_love_younger_sisterWA 0ms3676kbC++23941b2024-08-16 15:50:222024-08-16 15:50:22

Judging History

你现在查看的是最新测评结果

  • [2024-08-16 15:50:22]
  • 评测
  • 测评结果:WA
  • 用时:0ms
  • 内存:3676kb
  • [2024-08-16 15:50:22]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mod=998244353;
int qpow(int a, int b, int p)
{
	int res = 1;
	while(b)
	{
		if(b & 1) res = res * a % p;
		a = a * a % p;
		b >>= 1;
	}
	return res;
}
int qpow1(int a,int b){
	int res = 1;
	while(b)
	{
		if(b & 1) res = res * a;
		a = a * a;
		b >>= 1;
	}
	return res;
}
int ny(int x){
	return qpow(x,mod-2,mod);
}
int qf(int n){
	return n%mod*(n+1)%mod*(2*n%mod+1)%mod*ny(6)%mod;
}
signed main(){
	int n,sum=0;
	cin >> n;
	for(int a=2;a<=sqrt(n);a++){
		int k=2;
		while(qpow1(a,k)<=n){
			k++;
		}
		k--;
		sum=(sum+a%mod*(n+1)%mod*k%mod+(mod-a%mod*a%mod*((qpow(a,k,mod)+mod-1)%mod)*ny(a-1)%mod)%mod)%mod;
	}
	int a1=sqrt(n);
	a1++;
//	cout << a1 << "\n";
//	cout << qf(n) << " " << qf(a1-1) << "\n";
	sum=(sum+(a1+n)%mod*(n-a1+1)%mod*(n+1)%mod*ny(2)%mod+(mod-qf(n))%mod+qf(a1-1))%mod;
	cout << sum;
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3576kb

input:

2

output:

2

result:

ok 1 number(s): "2"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3640kb

input:

10

output:

236

result:

ok 1 number(s): "236"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3648kb

input:

20

output:

1646

result:

ok 1 number(s): "1646"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3652kb

input:

27

output:

3862

result:

ok 1 number(s): "3862"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3676kb

input:

37

output:

9571

result:

ok 1 number(s): "9571"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3576kb

input:

100

output:

175028

result:

ok 1 number(s): "175028"

Test #7:

score: 0
Accepted
time: 0ms
memory: 3524kb

input:

123

output:

322744

result:

ok 1 number(s): "322744"

Test #8:

score: 0
Accepted
time: 0ms
memory: 3520kb

input:

2548

output:

765669726

result:

ok 1 number(s): "765669726"

Test #9:

score: 0
Accepted
time: 0ms
memory: 3524kb

input:

12448

output:

159637196

result:

ok 1 number(s): "159637196"

Test #10:

score: 0
Accepted
time: 0ms
memory: 3576kb

input:

65535

output:

120089112

result:

ok 1 number(s): "120089112"

Test #11:

score: -100
Wrong Answer
time: 0ms
memory: 3672kb

input:

102458

output:

409582063

result:

wrong answer 1st numbers differ - expected: '475774506', found: '409582063'