QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#714245 | #8339. Rooted Tree | Palbudir# | AC ✓ | 1139ms | 3720kb | C++20 | 980b | 2024-11-05 22:14:49 | 2024-11-05 22:14:49 |
Judging History
answer
#include <bits/stdc++.h>
using i80 = __int128;
using i64 = long long;
using f80 = long double;
constexpr i64 mod = 1e9 + 9;
i64 pw(i64 x, i64 k) {
i64 z = 1;
while (k) {
if (k & 1) {
z = z * x % mod;
}
x = x * x % mod;
k >>= 1;
}
return z;
}
i64 inv(i64 x) {
return pw(x, mod - 2);
}
void work() {
int m, k;
std::cin >> m >> k;
i64 cnt = 0, sum = 0, tmp;
for (int i = 1; i <= k; ++i) {
tmp = inv(((m - 1) * (i - 1) + 1) % mod);
sum = (sum + cnt * m % mod * tmp + m) % mod;
cnt = (cnt * ((m - 1) * i % mod + 1) % mod * tmp % mod + m) % mod;
}
std::cout << sum << "\n";
return;
}
void init() {
}
int main() {
init();
std::ios::sync_with_stdio(false);
// std::cin.tie(nullptr), std::cout.tie(nullptr);
int t = 1;
// std::cin >> t;
while (t--) {
work();
}
return 0;
}
/*
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3648kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3660kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 70ms
memory: 3668kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 760ms
memory: 3704kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3624kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 828ms
memory: 3592kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 464ms
memory: 3720kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1125ms
memory: 3644kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 202ms
memory: 3708kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 617ms
memory: 3648kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 366ms
memory: 3588kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 333ms
memory: 3648kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 981ms
memory: 3596kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1139ms
memory: 3648kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1135ms
memory: 3644kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1135ms
memory: 3704kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed