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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
#453986#8702. 狼人杀2745518585100 ✓1078ms63932kbC++201.1kb2024-06-24 15:23:412024-06-24 15:23:45

Judging History

你现在查看的是最新测评结果

  • [2024-06-24 15:23:45]
  • 评测
  • 测评结果:100
  • 用时:1078ms
  • 内存:63932kb
  • [2024-06-24 15:23:41]
  • 提交

answer

#include<cstdio>
#include<algorithm>
using namespace std;
typedef long long ll;
const int N=201;
const ll P=1e9+7;
int n,p;
ll f[N][N*N][2];
void exgcd(ll a,ll b,ll &x,ll &y)
{
    if(b==0) x=1,y=0;
    else exgcd(b,a%b,y,x),y-=a/b*x;
}
ll inv(ll a)
{
    a=(a%P+P)%P;
    ll x,y;
    exgcd(a,P,x,y);
    x=(x%P+P)%P;
    return x;
}
ll sum(ll x)
{
    return x*(x+1)/2;
}
int main()
{
    scanf("%d%d",&n,&p);
    p=n-p+1;
    f[0][0][0]=1;
    for(int i=1;i<=n+1;++i)
    {
        if(i==p) continue;
        for(int j=0;j<=i-1;++j)
        {
            for(int k=0;k<=n*n;++k)
            {
                for(int l:{0,1})
                {
                    f[i][k+sum(i-j-1)][l]=(f[i][k+sum(i-j-1)][l]-f[j][k][l])%P;
                }
                f[i][k+sum(i-j-1)][1]=(f[i][k+sum(i-j-1)][1]-f[j][k][0]*(i-j-1-(j<p&&p<i))%P)%P;
            }
        }
    }
    ll s=0;
    for(int i=0;i<=n*n;++i)
    {
        s=(s+f[n+1][i][1]*inv(1-i*inv(sum(n))%P)%P)%P;
    }
    printf("%lld",(s*inv(n-1)%P+P)%P);
    return 0;
}

詳細信息

Subtask #1:

score: 23
Accepted

Test #1:

score: 23
Accepted
time: 0ms
memory: 1632kb

input:

12 2

output:

183756997

result:

ok single line: '183756997'

Test #2:

score: 0
Accepted
time: 0ms
memory: 1772kb

input:

17 6

output:

97571903

result:

ok single line: '97571903'

Test #3:

score: 0
Accepted
time: 0ms
memory: 1724kb

input:

13 3

output:

209826617

result:

ok single line: '209826617'

Test #4:

score: 0
Accepted
time: 0ms
memory: 1736kb

input:

13 8

output:

176038768

result:

ok single line: '176038768'

Test #5:

score: 0
Accepted
time: 0ms
memory: 1768kb

input:

18 4

output:

288404061

result:

ok single line: '288404061'

Test #6:

score: 0
Accepted
time: 0ms
memory: 1608kb

input:

10 10

output:

219657163

result:

ok single line: '219657163'

Test #7:

score: 0
Accepted
time: 0ms
memory: 1796kb

input:

19 15

output:

590577825

result:

ok single line: '590577825'

Test #8:

score: 0
Accepted
time: 0ms
memory: 1680kb

input:

11 6

output:

488143489

result:

ok single line: '488143489'

Test #9:

score: 0
Accepted
time: 0ms
memory: 1712kb

input:

10 5

output:

470594541

result:

ok single line: '470594541'

Test #10:

score: 0
Accepted
time: 0ms
memory: 1820kb

input:

20 5

output:

582458555

result:

ok single line: '582458555'

Test #11:

score: 0
Accepted
time: 0ms
memory: 1864kb

input:

20 12

output:

648081410

result:

ok single line: '648081410'

Test #12:

score: 0
Accepted
time: 0ms
memory: 1832kb

input:

20 4

output:

335777285

result:

ok single line: '335777285'

Test #13:

score: 0
Accepted
time: 0ms
memory: 1868kb

input:

20 15

output:

389216500

result:

ok single line: '389216500'

Test #14:

score: 0
Accepted
time: 0ms
memory: 1828kb

input:

20 16

output:

582458555

result:

ok single line: '582458555'

Test #15:

score: 0
Accepted
time: 0ms
memory: 1860kb

input:

20 19

output:

589126150

result:

ok single line: '589126150'

Test #16:

score: 0
Accepted
time: 0ms
memory: 1864kb

input:

20 6

output:

389216500

result:

ok single line: '389216500'

Subtask #2:

score: 34
Accepted

Dependency #1:

100%
Accepted

Test #17:

score: 34
Accepted
time: 14ms
memory: 4016kb

input:

49 14

output:

486918542

result:

ok single line: '486918542'

Test #18:

score: 0
Accepted
time: 0ms
memory: 2148kb

input:

28 13

output:

642223597

result:

ok single line: '642223597'

Test #19:

score: 0
Accepted
time: 4ms
memory: 2516kb

input:

35 23

output:

842346505

result:

ok single line: '842346505'

Test #20:

score: 0
Accepted
time: 11ms
memory: 3728kb

input:

47 11

output:

583647040

result:

ok single line: '583647040'

Test #21:

score: 0
Accepted
time: 3ms
memory: 2452kb

input:

34 30

output:

990970048

result:

ok single line: '990970048'

Test #22:

score: 0
Accepted
time: 2ms
memory: 2256kb

input:

30 7

output:

393675971

result:

ok single line: '393675971'

Test #23:

score: 0
Accepted
time: 8ms
memory: 3100kb

input:

43 5

output:

737421246

result:

ok single line: '737421246'

Test #24:

score: 0
Accepted
time: 2ms
memory: 2204kb

input:

30 21

output:

254760745

result:

ok single line: '254760745'

Test #25:

score: 0
Accepted
time: 0ms
memory: 2084kb

input:

27 22

output:

266692865

result:

ok single line: '266692865'

Test #26:

score: 0
Accepted
time: 6ms
memory: 3000kb

input:

40 12

output:

133652311

result:

ok single line: '133652311'

Test #27:

score: 0
Accepted
time: 2ms
memory: 2184kb

input:

29 4

output:

873892090

result:

ok single line: '873892090'

Test #28:

score: 0
Accepted
time: 15ms
memory: 4140kb

input:

50 46

output:

267950067

result:

ok single line: '267950067'

Test #29:

score: 0
Accepted
time: 15ms
memory: 4072kb

input:

50 11

output:

423642322

result:

ok single line: '423642322'

Test #30:

score: 0
Accepted
time: 11ms
memory: 4136kb

input:

50 43

output:

625476642

result:

ok single line: '625476642'

Test #31:

score: 0
Accepted
time: 15ms
memory: 3976kb

input:

50 36

output:

767166129

result:

ok single line: '767166129'

Test #32:

score: 0
Accepted
time: 15ms
memory: 4076kb

input:

50 14

output:

357467965

result:

ok single line: '357467965'

Test #33:

score: 0
Accepted
time: 15ms
memory: 4128kb

input:

50 30

output:

219673347

result:

ok single line: '219673347'

Test #34:

score: 0
Accepted
time: 15ms
memory: 4096kb

input:

50 44

output:

392786132

result:

ok single line: '392786132'

Test #35:

score: 0
Accepted
time: 15ms
memory: 3964kb

input:

50 10

output:

848251616

result:

ok single line: '848251616'

Subtask #3:

score: 43
Accepted

Dependency #1:

100%
Accepted

Dependency #2:

100%
Accepted

Test #36:

score: 43
Accepted
time: 64ms
memory: 9604kb

input:

75 47

output:

668751416

result:

ok single line: '668751416'

Test #37:

score: 0
Accepted
time: 71ms
memory: 9640kb

input:

75 41

output:

310834114

result:

ok single line: '310834114'

Test #38:

score: 0
Accepted
time: 649ms
memory: 45192kb

input:

133 124

output:

57167600

result:

ok single line: '57167600'

Test #39:

score: 0
Accepted
time: 584ms
memory: 41280kb

input:

129 74

output:

751074385

result:

ok single line: '751074385'

Test #40:

score: 0
Accepted
time: 684ms
memory: 47104kb

input:

135 133

output:

759430862

result:

ok single line: '759430862'

Test #41:

score: 0
Accepted
time: 72ms
memory: 9640kb

input:

75 19

output:

967921272

result:

ok single line: '967921272'

Test #42:

score: 0
Accepted
time: 496ms
memory: 36844kb

input:

124 9

output:

641081661

result:

ok single line: '641081661'

Test #43:

score: 0
Accepted
time: 68ms
memory: 9944kb

input:

76 66

output:

465902083

result:

ok single line: '465902083'

Test #44:

score: 0
Accepted
time: 835ms
memory: 54428kb

input:

142 13

output:

12401929

result:

ok single line: '12401929'

Test #45:

score: 0
Accepted
time: 1069ms
memory: 63772kb

input:

150 5

output:

388058135

result:

ok single line: '388058135'

Test #46:

score: 0
Accepted
time: 305ms
memory: 25820kb

input:

109 97

output:

381109644

result:

ok single line: '381109644'

Test #47:

score: 0
Accepted
time: 1073ms
memory: 63868kb

input:

150 133

output:

174431234

result:

ok single line: '174431234'

Test #48:

score: 0
Accepted
time: 1054ms
memory: 63900kb

input:

150 147

output:

198921722

result:

ok single line: '198921722'

Test #49:

score: 0
Accepted
time: 1059ms
memory: 63932kb

input:

150 142

output:

631473185

result:

ok single line: '631473185'

Test #50:

score: 0
Accepted
time: 1075ms
memory: 63900kb

input:

150 136

output:

743180069

result:

ok single line: '743180069'

Test #51:

score: 0
Accepted
time: 1058ms
memory: 63884kb

input:

150 138

output:

621574340

result:

ok single line: '621574340'

Test #52:

score: 0
Accepted
time: 1078ms
memory: 63916kb

input:

150 119

output:

872660153

result:

ok single line: '872660153'

Test #53:

score: 0
Accepted
time: 1076ms
memory: 63896kb

input:

150 144

output:

939939060

result:

ok single line: '939939060'

Test #54:

score: 0
Accepted
time: 1056ms
memory: 63708kb

input:

150 1

output:

166208360

result:

ok single line: '166208360'

Test #55:

score: 0
Accepted
time: 1072ms
memory: 63792kb

input:

150 75

output:

353929212

result:

ok single line: '353929212'