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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 | 2745518585 | 100 ✓ | 1078ms | 63932kb | C++20 | 1.1kb | 2024-06-24 15:23:41 | 2024-06-24 15:23:45 |
Judging History
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:
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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:
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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'