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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#355176#8339. Rooted Treeucup-team1525#AC ✓213ms199204kbC++17904b2024-03-16 14:09:442024-03-16 14:09:44

Judging History

你现在查看的是最新测评结果

  • [2024-03-16 14:09:44]
  • 评测
  • 测评结果:AC
  • 用时:213ms
  • 内存:199204kb
  • [2024-03-16 14:09:44]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
const int N=1e7;
const int mod=1e9+9;
int ksm(ll x,int tp,int s=1){
    for(;tp;x=x*x%mod,tp>>=1) if(tp&1) s=x*s%mod;
    return s;
}
int n,m;
int val[N+5];
int pre[N+5],iv[N+5];
int f[N+5],g[N+5];
int main(){
    scanf("%d %d",&n,&m);
    for(int i=1;i<=m;i++)
        val[i]=i*(n-1)+1;
    pre[0]=1;
    for(int i=1;i<=m;i++)
        pre[i]=1ll*val[i]*pre[i-1]%mod;
    iv[m]=ksm(pre[m],mod-2);
    for(int i=m;i;i--)
        iv[i-1]=1ll*iv[i]*val[i]%mod;
    for(int i=m;i;i--){
        iv[i]=1ll*pre[i-1]*iv[i]%mod;
        // printf("%d ",iv[i]);
    }
    // puts("");
    for(int i=1;i<=m;i++){
        f[i]=(f[i-1]+1ll*(g[i-1]+1)*n)%mod;
        g[i]=(1ll*g[i-1]*(i-1)*(n-1)+1ll*(g[i-1]+1)*n)%mod*iv[i]%mod;
        // printf("%d %d\n",f[i],g[i]);
    }
    printf("%d\n",f[m]);
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 5808kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 1ms
memory: 5952kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 13ms
memory: 16316kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 134ms
memory: 136996kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 1ms
memory: 5964kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 141ms
memory: 148508kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 91ms
memory: 85112kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 209ms
memory: 197884kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 42ms
memory: 40956kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 111ms
memory: 111008kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 65ms
memory: 68448kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 62ms
memory: 60912kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 185ms
memory: 172836kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 204ms
memory: 199052kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 213ms
memory: 199204kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 213ms
memory: 199092kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed