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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#709256#8339. Rooted Tree_LSA_AC ✓276ms316184kbC++141.3kb2024-11-04 13:21:562024-11-04 13:21:56

Judging History

你现在查看的是最新测评结果

  • [2024-11-04 13:21:56]
  • 评测
  • 测评结果:AC
  • 用时:276ms
  • 内存:316184kb
  • [2024-11-04 13:21:56]
  • 提交

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