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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#685403 | #8339. Rooted Tree | UESTC_NLNS# | AC ✓ | 1444ms | 3700kb | C++20 | 1006b | 2024-10-28 19:17:13 | 2024-10-28 19:17:13 |
Judging History
answer
#include <cassert>
#include <iostream>
#include <vector>
using namespace std;
const int mod = 1e9 + 9;
using ll = long long;
int qpow(int x, ll y) {
ll ans = 1;
for (; y; y >>= 1, x = 1ll * x * x % mod) {
if (y & 1) ans = ans * x % mod;
}
return ans;
}
int inv(int x) {
return qpow(x, mod - 2);
}
void sub(int& a, int b) {
a = a >= b ? a - b : a + mod - b;
}
int main() {
cin.tie(0), cout.tie(0), ios::sync_with_stdio(0);
int m, k;
cin >> m >> k;
ll F = 1;
ll F1 = 0;
ll ans = 0;
for (int i = 0, tmp = 1; i < k; ++i, tmp += m - 1) {
int k = 1ll * m * inv(tmp) % mod;
int val = 1ll * (tmp + m - 1) * inv(tmp) % mod;
ans += (F1 + F) * inv(tmp) % mod * m % mod;
F1 = (F1 * val + F * k) % mod;
F = F * val % mod;
// cout << F1 << " " << F << '\n';
// cout << (F1 + F) * inv(tmp) * m << '\n';
// cout << '\n';
}
cout << ans % mod << '\n';
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3572kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 3632kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 89ms
memory: 3572kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 970ms
memory: 3636kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3644kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 1055ms
memory: 3636kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 592ms
memory: 3700kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1433ms
memory: 3568kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 261ms
memory: 3576kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 783ms
memory: 3568kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 464ms
memory: 3636kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 422ms
memory: 3696kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 1243ms
memory: 3616kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1439ms
memory: 3644kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1444ms
memory: 3700kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1440ms
memory: 3616kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed