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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 |
---|---|---|---|---|---|---|---|---|---|
#352160 | #8339. Rooted Tree | grass8cow | AC ✓ | 157ms | 121536kb | C++17 | 681b | 2024-03-12 22:10:58 | 2024-03-12 22:10:58 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+9;
int n,m,ans;
int qpow(int a,int b){
int c=1;
for(;b;b>>=1){
if(b&1)c=1ll*a*c%mod;
a=1ll*a*a%mod;
}
return c;
}
int av[10100000],jc[10010000],ij[10100000];
int main(){
scanf("%d%d",&n,&m);
jc[0]=1;
for(int i=1;i<=m;i++)
av[i]=(n-1)*i+1,jc[i]=1ll*jc[i-1]*av[i]%mod;
ij[m]=qpow(jc[m],mod-2);
for(int i=m;i;i--)ij[i-1]=1ll*av[i]*ij[i]%mod;
for(int i=1;i<=m;i++){
//后面还会接入n(m-i)个点,当前共(n-1)i+1个叶子
//(n(m-i)/((n-1)i+1)+1)*n
int xp=1ll*n*(m-i)%mod*jc[i-1]%mod*ij[i]%mod+1;
(ans+=xp)%=mod;
}
return printf("%lld",(1ll*ans*n%mod+mod)%mod),0;
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 8004kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 8024kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 11ms
memory: 16288kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 83ms
memory: 85328kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 1ms
memory: 7948kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 111ms
memory: 93276kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 60ms
memory: 55300kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 148ms
memory: 120816kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 23ms
memory: 29980kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 91ms
memory: 69068kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 52ms
memory: 44572kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 44ms
memory: 42768kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 124ms
memory: 107804kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 156ms
memory: 121532kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 157ms
memory: 121452kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 143ms
memory: 121536kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed