QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#709256 | #8339. Rooted Tree | _LSA_ | AC ✓ | 276ms | 316184kb | C++14 | 1.3kb | 2024-11-04 13:21:56 | 2024-11-04 13:21:56 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define fi first
#define se second
#define mk make_pair
using namespace std;
ll read(){
ll X = 0 ,r = 1;
char ch = getchar();
while(!isdigit(ch) && ch != '-') ch = getchar();
if(ch == '-') r = -1,ch = getchar();
while(isdigit(ch)) X = X*10+ch-'0',ch = getchar();
return X*r;
}
const int mod = 1e9+9;
const int N = 1e7+10;
int m,k;
ll fpow(ll x,ll k){
ll res = 1;
while(k){
if(k & 1)
res = res*x%mod;
x = x*x%mod;
k >>= 1;
}
return res;
}
ll sum[N],inv[N],f[N],g[N];
void init(){
sum[1] = 1;
for(int i=2;i<=k;i++) sum[i] = sum[i-1]+m-1;
f[0] = 1; g[k+1] = 1;
for(int i=1;i<=k;i++) f[i] = f[i-1]*sum[i]%mod;
for(int i=k;i>=1;i--) g[i] = g[i+1]*sum[i]%mod;
ll mul = f[k]; mul = fpow(mul,mod-2);
for(int i=1;i<=k;i++) inv[i] = mul*f[i-1]%mod*g[i+1]%mod;
for(int i=0;i<=k+1;i++) f[i] = g[i] = 0;
}
int main(){
m = read(); k = read()+1;
init();
f[1] = g[1] = 0;
for(int i=2;i<=k;i++){
f[i] = (f[i-1]+m*(g[i-1]+1)%mod)%mod;
g[i] = (g[i-1]*(sum[i-1]-1)%mod+(g[i-1]+1)*m%mod)%mod*inv[i]%mod;
}
cout << f[k];
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 9780kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 9832kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 16ms
memory: 31204kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 166ms
memory: 217316kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 9776kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 170ms
memory: 236860kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 105ms
memory: 138988kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 256ms
memory: 314540kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 43ms
memory: 65704kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 146ms
memory: 178528kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 82ms
memory: 111176kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 72ms
memory: 100768kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 215ms
memory: 275812kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 221ms
memory: 316184kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 276ms
memory: 316028kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 256ms
memory: 316104kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed