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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#638763 | #8339. Rooted Tree | ainuo | AC ✓ | 1118ms | 159932kb | C++14 | 755b | 2024-10-13 16:51:23 | 2024-10-13 16:51:23 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=1e7+10;
const int mod=1e9+9;
ll num[N],dp[N];
ll qpow(ll n,ll m)
{
ll ans=1;
while(m)
{
if(m&1) ans=ans*n%mod;
m>>=1;
n=n*n%mod;
}
return ans;
}
ll getInv(ll a)
{
return qpow(a,mod-2);
}
int main()
{
int m,k;
ll ans=0;
cin>>m>>k;
num[0]=1;
for(int i=1;i<=k;i++) num[i]=num[i-1]+m-1;
dp[0]=0;
for(int i=1;i<=k;i++)
{
dp[i]=((((dp[i-1]*num[i-1])%mod+((dp[i-1]+1)*(m-1))%mod+1)%mod)*getInv(num[i]))%mod;
ans=(ans+dp[i-1])%mod;
}
// cout<<num[1]<<'\n';
// cout<<(dp[1]*num[1])%mod<<'\n';
ans=(ans+((dp[k]*num[k])%mod))%mod;
cout<<ans;
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 5600kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5668kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 71ms
memory: 18264kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 758ms
memory: 110268kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 1ms
memory: 5604kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 822ms
memory: 120604kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 452ms
memory: 71704kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1105ms
memory: 159408kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 193ms
memory: 32416kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 601ms
memory: 92188kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 346ms
memory: 57700kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 325ms
memory: 51252kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 957ms
memory: 141752kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1118ms
memory: 159884kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1110ms
memory: 159932kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1106ms
memory: 159752kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed