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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#547249 | #8339. Rooted Tree | light_ink_dots# | AC ✓ | 1369ms | 44332kb | C++20 | 927b | 2024-09-04 19:40:03 | 2024-09-04 19:40:03 |
Judging History
answer
//最接近夜的灰褪去的那抹苍蓝
#include<bits/stdc++.h>
using namespace std;
const int maxm=105,maxn=10000005,mod=1000000009;
int m,n,ans;
int fac[maxn],inv[maxn],nfac[maxn],f[maxn];
inline int C(int a,int b){
return a<b? 0:1ll*fac[a]*nfac[a-b]%mod*nfac[b]%mod;
}
int ksm(int a,int b){
int res=1;
while(b){
if(b&1)
res=1ll*res*a%mod;
a=1ll*a*a%mod,b>>=1;
}
return res;
}
int main(){
scanf("%d%d",&m,&n);
//cnt[i]=1+i*(m-1)
/*fac[0]=fac[1]=nfac[0]=nfac[1]=inv[1]=1;
for(int i=2;i<maxn;i++)
fac[i]=1ll*fac[i-1]*i%mod,inv[i]=mod-1ll*(mod/i)*inv[mod%i]%mod,nfac[i]=1ll*nfac[i-1]*inv[i]%mod;*/
f[0]=0;
for(int i=1;i<=n;i++){
int iv=ksm(1+(i-1)*(m-1),mod-2);
f[i]=(f[i-1]+1ll*f[i-1]*(m-1)%mod*iv+m)%mod;
int val=(1ll*f[i-1]*m%mod*iv+m)%mod;
ans=(ans+val)%mod;
// printf("i=%d f[i]=%d\n",i,f[i]);
// cnt[i]*(-i+(i+1)*m)
}
printf("%d\n",ans);
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3884kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3844kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 81ms
memory: 6228kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 922ms
memory: 31412kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3892kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 1004ms
memory: 33828kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 540ms
memory: 20304kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1363ms
memory: 43216kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 248ms
memory: 11568kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 745ms
memory: 25584kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 442ms
memory: 17616kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 378ms
memory: 16856kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 1174ms
memory: 39192kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1362ms
memory: 43888kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1357ms
memory: 44332kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1369ms
memory: 44264kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed