QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #606898 | #8339. Rooted Tree | xingrin# | AC ✓ | 1124ms | 3748kb | C++14 | 843b | 2024-10-03 12:54:59 | 2024-10-03 12:55:00 |
Judging History
answer
#pragma GCC optimize(2)
#include <bits/stdc++.h>
#define F first
#define S second
#define endl '\n'
#define int ll
#define IOS ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<double,double> pdd;
const int mod = 1e9+9;
ll qmi(ll a,ll b){
ll res=1;
while(b){
if(b&1) res=(res*a)%mod;
a=(a*a)%mod;
b>>=1;
}
return res;
}
void solve()
{
ll cnt = 0;
ll num = 1;
ll sum = 0;
ll m,k;
cin>>m>>k;
ll ans = 0;
for(int i=1;i<=k;i++)
{
ans = (ans + (cnt+1)*m%mod)%mod;
num = num + m - 1;
sum = ((sum-cnt+m*(cnt+1)%mod)%mod + mod)%mod;
cnt = sum*qmi(num, mod-2)%mod;
}
cout<<ans;
}
signed main()
{
IOS;
int T = 1;
// cin>>T;
while(T--)
{
solve();
}
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3724kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3668kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 69ms
memory: 3748kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 754ms
memory: 3668kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3608kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 817ms
memory: 3664kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 461ms
memory: 3584kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1110ms
memory: 3600kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 203ms
memory: 3736kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 604ms
memory: 3600kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 357ms
memory: 3660kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 328ms
memory: 3680kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 967ms
memory: 3688kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1123ms
memory: 3664kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1123ms
memory: 3688kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1124ms
memory: 3680kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed