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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#355176 | #8339. Rooted Tree | ucup-team1525# | AC ✓ | 213ms | 199204kb | C++17 | 904b | 2024-03-16 14:09:44 | 2024-03-16 14:09:44 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
const int N=1e7;
const int mod=1e9+9;
int ksm(ll x,int tp,int s=1){
for(;tp;x=x*x%mod,tp>>=1) if(tp&1) s=x*s%mod;
return s;
}
int n,m;
int val[N+5];
int pre[N+5],iv[N+5];
int f[N+5],g[N+5];
int main(){
scanf("%d %d",&n,&m);
for(int i=1;i<=m;i++)
val[i]=i*(n-1)+1;
pre[0]=1;
for(int i=1;i<=m;i++)
pre[i]=1ll*val[i]*pre[i-1]%mod;
iv[m]=ksm(pre[m],mod-2);
for(int i=m;i;i--)
iv[i-1]=1ll*iv[i]*val[i]%mod;
for(int i=m;i;i--){
iv[i]=1ll*pre[i-1]*iv[i]%mod;
// printf("%d ",iv[i]);
}
// puts("");
for(int i=1;i<=m;i++){
f[i]=(f[i-1]+1ll*(g[i-1]+1)*n)%mod;
g[i]=(1ll*g[i-1]*(i-1)*(n-1)+1ll*(g[i-1]+1)*n)%mod*iv[i]%mod;
// printf("%d %d\n",f[i],g[i]);
}
printf("%d\n",f[m]);
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 5808kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5952kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 13ms
memory: 16316kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 134ms
memory: 136996kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 1ms
memory: 5964kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 141ms
memory: 148508kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 91ms
memory: 85112kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 209ms
memory: 197884kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 42ms
memory: 40956kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 111ms
memory: 111008kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 65ms
memory: 68448kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 62ms
memory: 60912kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 185ms
memory: 172836kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 204ms
memory: 199052kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 213ms
memory: 199204kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 213ms
memory: 199092kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed