QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#507437 | #8339. Rooted Tree | ucup-team2307# | AC ✓ | 1201ms | 3716kb | C++20 | 1.0kb | 2024-08-06 17:40:57 | 2024-08-06 17:40:57 |
Judging History
answer
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
typedef long long ll;
#define int ll
#define fi first
#define se second
#define pb push_back
typedef long double ld;
#define double ld
const int mod = 1e9+9;
int bpow(int a, int b)
{
int r = 1;
while (b > 0)
{
if (b&1)
r = r*a%mod;
a = a*a%mod;
b/=2;
}
return r;
}
int inv(int a)
{
return bpow(a, mod-2);
}
signed main()
{
cin.tie(0)->sync_with_stdio(0);
cin.exceptions(cin.failbit);
int M, K;
// M = 6;
// K = 2;
cin>>M>>K;
int iM = inv(M);
int n = 1;
int s = 0;
for (int i=0; i<K; i++)
{
int up = (s*(1-iM)+n)%mod*M%mod;
int down = ((n-1)*(M-1)%mod*iM+1)%mod;
// cout<<up<<"/"<<down<<"\n";
int ds = up*inv(down)%mod;
s = (s+ds)%mod;
s = (s+mod)%mod;
n = (n+M)%mod;
// cout<<n<<" "<<s<<"\n";
}
cout<<s<<"\n";
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3588kb
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: 74ms
memory: 3676kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 805ms
memory: 3656kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3716kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 875ms
memory: 3592kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 492ms
memory: 3708kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1189ms
memory: 3652kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 212ms
memory: 3592kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 651ms
memory: 3712kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 385ms
memory: 3592kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 350ms
memory: 3588kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 1032ms
memory: 3648kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1201ms
memory: 3652kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1198ms
memory: 3712kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1198ms
memory: 3648kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed