QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#521850 | #7046. Function! | QF_love_younger_sister | WA | 0ms | 3676kb | C++23 | 941b | 2024-08-16 15:50:22 | 2024-08-16 15:50:22 |
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-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
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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'