QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#419000 | #8339. Rooted Tree | youthpaul | AC ✓ | 1388ms | 3660kb | C++20 | 855b | 2024-05-23 16:54:17 | 2024-05-23 16:54:19 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int P = 1e9+9;
struct mint {
int x;
mint(int x = 0) : x(x) {}
// mint(int x = 0) : x((x%P+P)%P) {}
mint pow(int b) {
mint ans = 1, a = *this;
for (;b;b>>=1,a =a*a) {
if (b&1) ans = ans*a;
// cout<< ans.x<< ' '<< a.x<< '\n';
}
return ans;
}
mint operator*(mint r) { r.x = 1ll * r.x * x % P; return r; }
mint operator+(mint r) { (r.x+=x) %= P; return r;}
};
int main() {
cin.tie(0)->sync_with_stdio(0);
// mint tt; tt.x=2;
// cout<< tt.pow(P-2).x<< '\n';
int m, k; cin>> m>> k;
mint l=0, a=0;
for (int i = 0; i < k; i++) {
mint inv; inv.x = 1 + (m-1)*i;
inv = inv.pow(P-2);
a = a + l * inv;
l = l * mint((m-1)*i + m) * inv + mint(m);
// cout<< 1 + (m-1)*i<< ' '<< inv.x<< ' '<< a.x<< ' '<< l.x<< '\n';
}
cout<< (a + l).x<< '\n';
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3500kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3584kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 86ms
memory: 3580kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 932ms
memory: 3600kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3660kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 1014ms
memory: 3584kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 570ms
memory: 3528kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1377ms
memory: 3524kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 250ms
memory: 3588kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 748ms
memory: 3588kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 448ms
memory: 3652kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 406ms
memory: 3584kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 1196ms
memory: 3604kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1388ms
memory: 3528kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1388ms
memory: 3548kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1388ms
memory: 3600kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed