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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#352160#8339. Rooted Treegrass8cowAC ✓157ms121536kbC++17681b2024-03-12 22:10:582024-03-12 22:10:58

Judging History

你现在查看的是最新测评结果

  • [2024-03-12 22:10:58]
  • 评测
  • 测评结果:AC
  • 用时:157ms
  • 内存:121536kb
  • [2024-03-12 22:10:58]
  • 提交

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;
}

Details

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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