QOJ.ac
QOJ
| 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 |
|---|---|---|---|---|---|---|---|---|---|
| #597725 | #8339. Rooted Tree | Saton | AC ✓ | 1106ms | 3676kb | C++20 | 592b | 2024-09-28 18:33:01 | 2024-09-28 18:33:02 |
Judging History
answer
#include <bits/stdc++.h>
using i64 = long long;
constexpr int P = 1e9 + 9;
i64 power(i64 a, i64 b)
{
i64 res = 1;
for( ; b; b >>= 1, a = a * a % P)
if(b & 1) res = res * a % P;
return res;
}
int main()
{
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int m, k; std::cin >> m >> k;
i64 ans = 0, f = 0;
for(int i = 1; i <= k; i++)
{
i64 inv = power(1LL * (i - 1) * (m - 1) + 1, P - 2);
f = f*inv%P;
ans = (ans + f + 1) % P;
f = (f * (1LL * i * (m - 1) + 1) % P + m) % P;
}
std::cout << ans * m % P << "\n";
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3652kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3664kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 68ms
memory: 3672kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 742ms
memory: 3648kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3676kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 807ms
memory: 3596kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 454ms
memory: 3584kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1093ms
memory: 3664kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 196ms
memory: 3592kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 598ms
memory: 3596kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 357ms
memory: 3648kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 323ms
memory: 3648kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 952ms
memory: 3572kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1106ms
memory: 3656kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1106ms
memory: 3580kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1105ms
memory: 3652kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed