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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#353723#8339. Rooted Treearnold518AC ✓1416ms82052kbC++171.2kb2024-03-14 15:32:152024-03-14 15:32:16

Judging History

你现在查看的是最新测评结果

  • [2024-03-14 15:32:16]
  • 评测
  • 测评结果:AC
  • 用时:1416ms
  • 内存:82052kb
  • [2024-03-14 15:32:15]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e7;

const int MOD = 1e9+9;
struct mint
{
    int x;
    mint() : x(0) {}
    mint(int _x) : x(_x) {}
    mint operator + (int ot) const { return x+ot>=MOD ? x+ot-MOD : x+ot; }
    mint operator - () const { return x ? MOD-x : 0; }
    mint operator - (int ot) const { return x<ot ? x+MOD-ot : x-ot; }
    mint operator * (int ot) const { return 1ll*x*ot%MOD; }
    mint operator += (int ot) { return *this = *this + ot; }
    mint operator -= (int ot) { return *this = *this - ot; }
    mint operator *= (int ot) { return *this = *this * ot; }
    operator int () const { return x; }
};
mint mpow(mint x, ll a)
{
    mint ret=1;
    while(a)
    {
        if(a&1) ret*=x;
        x=x*x; a>>=1;
    }
    return ret;
}
mint inv(mint x) { return mpow(x, MOD-2); }

int M, K;
mint dp1[MAXN+10], dp2[MAXN+10];

int main()
{
    scanf("%d%d", &M, &K);
    for(int i=1; i<=K; i++)
    {
        mint t=inv((M-1)*(i-1)+1);
        dp1[i]=dp1[i-1]+dp1[i-1]*t*(M-1)+M;
        dp2[i]=dp2[i-1]+dp1[i-1]*t*M+M;
    }
    printf("%d\n", (int)dp2[K]);
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 7ms
memory: 82032kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 3ms
memory: 81952kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 88ms
memory: 82036kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 952ms
memory: 82044kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 0ms
memory: 82012kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 1030ms
memory: 81920kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 582ms
memory: 81980kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1399ms
memory: 82052kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 258ms
memory: 81908kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 768ms
memory: 81952kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 460ms
memory: 81904kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 411ms
memory: 81976kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 1223ms
memory: 82004kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1410ms
memory: 81984kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1416ms
memory: 81920kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1412ms
memory: 81916kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed