QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #797945 | #8339. Rooted Tree | Warma_Cute# | AC ✓ | 220ms | 159936kb | C++14 | 786b | 2024-12-03 21:35:18 | 2024-12-03 21:35:24 |
Judging History
answer
//
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define N 10000007
#define mid ((L+R)/2)
const int inf=1e18+7,p=1e9+9;
int v1,v2,m,k;
int fac[N],inv[N],sm=1;
int qpow(int x,int y) {
int r=1,b=x;
while(y) {
if(y&1) r=r*b%p;
b=b*b%p,y/=2;
} return r;
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0),cout.tie(0);
cin>>m>>k,fac[0]=1;
for(int i=1;i<=k;i++) fac[i]=fac[i-1]*(1+(m-1)*(i-1))%p;
inv[k]=qpow(fac[k],p-2);
for(int i=k-1;i>=1;i--) inv[i]=inv[i+1]*(1+(m-1)*(i))%p;
// m=1?
for(int i=1;i<=k;i++) {
int kv=inv[i]*fac[i-1]%p;
v1=v1+(m*v2%p*kv%p+m);
v2=v2+((m-1)*v2%p*kv%p+m);
v1%=p,v2%=p;
}
cout<<v1;
return 0;
}
/*
0 m-1 m 0 0 0 0 0 0
0
*/
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 5736kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5744kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 16ms
memory: 15664kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 141ms
memory: 110060kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 1ms
memory: 5720kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 154ms
memory: 120660kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 89ms
memory: 72076kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 218ms
memory: 159364kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 38ms
memory: 34420kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 121ms
memory: 92304kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 67ms
memory: 56960kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 60ms
memory: 52988kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 183ms
memory: 141608kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 220ms
memory: 159936kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 207ms
memory: 159916kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 212ms
memory: 159844kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed