QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#440008 | #8339. Rooted Tree | ucup-team1074# | TL | 1477ms | 6916kb | C++23 | 1.4kb | 2024-06-12 22:50:16 | 2024-06-12 22:50:18 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define LL long long
#define pb push_back
#define x first
#define y second
#define endl '\n'
const LL maxn = 4e05+7;
const LL N = 5e05+10;
const LL mod = 1e09+9;
const int inf = 0x3f3f3f3f;
const LL llinf = 5e18;
#define int long long
typedef pair<int,int>pl;
priority_queue<LL , vector<LL>, greater<LL> >mi;//小根堆
priority_queue<LL> ma;//大根堆
LL gcd(LL a, LL b){
return b > 0 ? gcd(b , a % b) : a;
}
LL lcm(LL a , LL b){
return a / gcd(a , b) * b;
}
int n , m;
vector<int>a(N , 0);
void init(int n){
for(int i = 0 ; i <= n ; i ++){
a[i] = 0;
}
}
LL qpow(LL a , LL b)//快速幂
{
LL sum=1;
while(b){
if(b&1){
sum=sum*a%mod;
}
a=a*a%mod;
b>>=1;
}
return sum;
}
void solve()
{
int m , k;
int pre = 0;
int tot = 1;
cin >> m >> k;
int ans = 0;
for(int i = 0 ; i < k ; i ++){
int choi = pre * qpow(tot , mod - 2);
choi %= mod;
ans += choi;
ans %= mod;
int add = m * (choi + (tot * qpow(tot , mod - 2) % mod));
add %= mod;
pre -= choi;
pre += add;
pre += mod * 4;
pre %= mod;
tot += m - 1;
tot %= mod;
}
cout << (ans + pre) % mod;
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cout.precision(10);
int t=1;
//cin>>t;
while(t--)
{
solve();
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 6792kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 2ms
memory: 6828kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 133ms
memory: 6876kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 1477ms
memory: 6844kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 2ms
memory: 6916kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: -100
Time Limit Exceeded
input:
28 7304152