QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #679847 | #8339. Rooted Tree | Yaimsea | AC ✓ | 1052ms | 82064kb | C++20 | 637b | 2024-10-26 18:53:32 | 2024-10-26 18:53:32 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const long long MOD=1e9+9;
long long m,k,ans,f[10000010];
inline long long ksm(long long a,long long b)
{
long long res=1;
while(b)
{
if(b&1)
res=res*a%MOD;
a=a*a%MOD,b>>=1;
}
return res;
}
int main()
{
long long i,lasinv,lassum,inv,sum=1;
scanf("%lld %lld",&m,&k);
for(i=1;i<=k;++i)
{
sum+=(m-1),inv=ksm(sum,MOD-2);
ans=(ans+(f[i-1]+1)*m)%MOD;
if(i==1)
{
f[1]=1;
lassum=sum,lasinv=inv;
}
else
{
f[i]=((f[i-1]*lassum+1+(f[i-1]+1)*(m-1))%MOD*inv)%MOD;
lassum=sum,lasinv=inv;
}
}
printf("%lld",ans);
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3844kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3708kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 66ms
memory: 9712kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 711ms
memory: 56708kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3696kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 782ms
memory: 61704kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 421ms
memory: 36692kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1036ms
memory: 81392kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 176ms
memory: 19544kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 569ms
memory: 46708kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 338ms
memory: 29756kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 303ms
memory: 27708kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 913ms
memory: 71892kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1040ms
memory: 82064kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1048ms
memory: 82000kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1052ms
memory: 81944kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed