QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#521858 | #7046. Function! | QF_love_younger_sister | WA | 35ms | 3776kb | C++23 | 963b | 2024-08-16 15:54:33 | 2024-08-16 15:54:35 |
Judging History
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+(mod-a%mod*a%mod*((qpow(a,k,mod)+mod-1)%mod)%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+(mod-qf(n))%mod)%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: 3720kb
input:
2
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
10
output:
236
result:
ok 1 number(s): "236"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3676kb
input:
20
output:
1646
result:
ok 1 number(s): "1646"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3648kb
input:
27
output:
3862
result:
ok 1 number(s): "3862"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3520kb
input:
37
output:
9571
result:
ok 1 number(s): "9571"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3648kb
input:
100
output:
175028
result:
ok 1 number(s): "175028"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3580kb
input:
123
output:
322744
result:
ok 1 number(s): "322744"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3616kb
input:
2548
output:
765669726
result:
ok 1 number(s): "765669726"
Test #9:
score: 0
Accepted
time: 0ms
memory: 3644kb
input:
12448
output:
159637196
result:
ok 1 number(s): "159637196"
Test #10:
score: 0
Accepted
time: 0ms
memory: 3728kb
input:
65535
output:
120089112
result:
ok 1 number(s): "120089112"
Test #11:
score: 0
Accepted
time: 0ms
memory: 3584kb
input:
102458
output:
475774506
result:
ok 1 number(s): "475774506"
Test #12:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
222333
output:
64337543
result:
ok 1 number(s): "64337543"
Test #13:
score: 0
Accepted
time: 0ms
memory: 3720kb
input:
485174
output:
312492357
result:
ok 1 number(s): "312492357"
Test #14:
score: 0
Accepted
time: 0ms
memory: 3668kb
input:
685479
output:
35530508
result:
ok 1 number(s): "35530508"
Test #15:
score: 0
Accepted
time: 0ms
memory: 3648kb
input:
1025481
output:
921523794
result:
ok 1 number(s): "921523794"
Test #16:
score: 0
Accepted
time: 1ms
memory: 3776kb
input:
9999999
output:
732610409
result:
ok 1 number(s): "732610409"
Test #17:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
7458658
output:
825346623
result:
ok 1 number(s): "825346623"
Test #18:
score: 0
Accepted
time: 1ms
memory: 3516kb
input:
5268475
output:
30938162
result:
ok 1 number(s): "30938162"
Test #19:
score: 0
Accepted
time: 1ms
memory: 3656kb
input:
2658478
output:
780038100
result:
ok 1 number(s): "780038100"
Test #20:
score: 0
Accepted
time: 1ms
memory: 3708kb
input:
10000000
output:
679483439
result:
ok 1 number(s): "679483439"
Test #21:
score: 0
Accepted
time: 2ms
memory: 3652kb
input:
100000000
output:
498142384
result:
ok 1 number(s): "498142384"
Test #22:
score: 0
Accepted
time: 4ms
memory: 3724kb
input:
1000000000
output:
69187994
result:
ok 1 number(s): "69187994"
Test #23:
score: 0
Accepted
time: 13ms
memory: 3520kb
input:
10000000000
output:
23566211
result:
ok 1 number(s): "23566211"
Test #24:
score: -100
Wrong Answer
time: 35ms
memory: 3520kb
input:
100000000000
output:
129076075
result:
wrong answer 1st numbers differ - expected: '247411531', found: '129076075'