QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#413558 | #7046. Function! | MCdyc | WA | 3ms | 3656kb | C++17 | 2.0kb | 2024-05-17 18:39:47 | 2024-05-17 18:39:47 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define int long long
const int mod = 998244353;
int in2;
int in6;
void INFACT2()
{
int x = 2;
int p = 998244353 - 2LL;
int res = 1;
while (p > 0)
{
if (p % 2 == 1)
res = res * x % mod;
x = x * x % mod;
p /= 2;
}
in2 = res;
}
void INFACT6()
{
int x = 6;
int p = 998244353LL - 2LL;
int res = 1;
while (p > 0)
{
if (p % 2 == 1)
res = res * x % mod;
x = x * x % mod;
p /= 2;
}
in6 = res;
}
int solve()
{
int n;
cin >> n;
int ans = 0;
int bottom = 1;
for (int i = 2; i * i <= n; i++)
{
bottom = i;
int buffer = 0;
int t = i;
int cnt = 1;
while (t <= n)
{
buffer += (min(t * i, n + 1) - t) * cnt % mod;
t *= i;
cnt++;
}
buffer %= mod;
ans += buffer * i % mod;
ans %= mod;
}
int i = bottom + 1;
// int b = (n + 1) % mod * (i * (n - i + 1) % mod + (n - i + 1) % mod * (n - i) % mod * in2 % mod) -
// n % mod * (n + 1) % mod * (2 * n + 1) % mod * in6 % mod + (i - 1) * i % mod * (2 * i - 1) % mod * in6 %
// mod;
// cout << b << '\n';
if (i <= n)
{
ans += (n + 1) % mod * (i * (n - i + 1) % mod + (n - i + 1) % mod * (n - i) % mod * in2 % mod) % mod -
n % mod * (n + 1) % mod * (2 * n + 1) % mod * in6 % mod +
(i - 1) * i % mod * (2 * i - 1) % mod * in6 % mod;
ans = (ans % mod + mod) % mod;
cout << ans << '\n';
}
return 0;
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int test = 1;
INFACT2();
INFACT6();
// cin >> test;
while (test--)
{
solve();
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 3616kb
input:
2
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 1ms
memory: 3648kb
input:
10
output:
236
result:
ok 1 number(s): "236"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3540kb
input:
20
output:
1646
result:
ok 1 number(s): "1646"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3548kb
input:
27
output:
3862
result:
ok 1 number(s): "3862"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3600kb
input:
37
output:
9571
result:
ok 1 number(s): "9571"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3568kb
input:
100
output:
175028
result:
ok 1 number(s): "175028"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3600kb
input:
123
output:
322744
result:
ok 1 number(s): "322744"
Test #8:
score: 0
Accepted
time: 1ms
memory: 3540kb
input:
2548
output:
765669726
result:
ok 1 number(s): "765669726"
Test #9:
score: 0
Accepted
time: 1ms
memory: 3656kb
input:
12448
output:
159637196
result:
ok 1 number(s): "159637196"
Test #10:
score: 0
Accepted
time: 0ms
memory: 3592kb
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: 3532kb
input:
222333
output:
64337543
result:
ok 1 number(s): "64337543"
Test #13:
score: 0
Accepted
time: 1ms
memory: 3548kb
input:
485174
output:
312492357
result:
ok 1 number(s): "312492357"
Test #14:
score: 0
Accepted
time: 0ms
memory: 3584kb
input:
685479
output:
35530508
result:
ok 1 number(s): "35530508"
Test #15:
score: 0
Accepted
time: 0ms
memory: 3604kb
input:
1025481
output:
921523794
result:
ok 1 number(s): "921523794"
Test #16:
score: 0
Accepted
time: 0ms
memory: 3608kb
input:
9999999
output:
732610409
result:
ok 1 number(s): "732610409"
Test #17:
score: 0
Accepted
time: 1ms
memory: 3656kb
input:
7458658
output:
825346623
result:
ok 1 number(s): "825346623"
Test #18:
score: 0
Accepted
time: 1ms
memory: 3532kb
input:
5268475
output:
30938162
result:
ok 1 number(s): "30938162"
Test #19:
score: 0
Accepted
time: 1ms
memory: 3548kb
input:
2658478
output:
780038100
result:
ok 1 number(s): "780038100"
Test #20:
score: 0
Accepted
time: 0ms
memory: 3588kb
input:
10000000
output:
679483439
result:
ok 1 number(s): "679483439"
Test #21:
score: 0
Accepted
time: 1ms
memory: 3540kb
input:
100000000
output:
498142384
result:
ok 1 number(s): "498142384"
Test #22:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
1000000000
output:
69187994
result:
ok 1 number(s): "69187994"
Test #23:
score: 0
Accepted
time: 1ms
memory: 3592kb
input:
10000000000
output:
23566211
result:
ok 1 number(s): "23566211"
Test #24:
score: -100
Wrong Answer
time: 3ms
memory: 3548kb
input:
100000000000
output:
25877103
result:
wrong answer 1st numbers differ - expected: '247411531', found: '25877103'