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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 |
---|---|---|---|---|---|---|---|---|---|
#379066 | #8339. Rooted Tree | BUET_POTATOES# | AC ✓ | 1087ms | 159888kb | C++20 | 904b | 2024-04-06 16:05:11 | 2024-04-06 16:05:12 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
const ll mod = 1e9+9;
const int nmax = 1e7+10;
ll leafcount[nmax];
ll e_leaf[nmax];
ll modexpo(ll x, ll n){
ll ret = 1;
while(n){
if(n&1) ret = ret * x % mod;
x = x * x % mod;
n /= 2;
}
return ret;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(NULL);
// cout<<84 * modexpo(5, mod-2) % mod <<endl;
ll m, k;
cin>>m>>k;
leafcount[0] = 1;
e_leaf[0] = 0;
ll ans = 0;
for(int i = 1; i<=k; i++){
leafcount[i] = leafcount[i-1] + (m-1);
ans += (e_leaf[i-1] + 1) * m;
ans %= mod;
e_leaf[i] = (e_leaf[i-1] * (leafcount[i-1] - 1) + (e_leaf[i-1] + 1) * m) % mod
;
e_leaf[i] = e_leaf[i] * modexpo(leafcount[i], mod-2) % mod;
}
cout<<ans<<endl;
}
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 5596kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5624kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 69ms
memory: 15412kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 724ms
memory: 109732kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 5660kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 789ms
memory: 120744kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 443ms
memory: 72136kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1075ms
memory: 159712kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 193ms
memory: 35320kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 580ms
memory: 89744kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 352ms
memory: 56788kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 324ms
memory: 52808kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 927ms
memory: 138828kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1076ms
memory: 159888kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1083ms
memory: 159792kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1087ms
memory: 159880kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed