QOJ.ac

QOJ

ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#525565	#8702. 狼人杀	DaiRuiChen007	100 ✓	305ms	31240kb	C++17	703b	2024-08-20 18:24:43	2024-08-20 18:24:44

Judging History

你现在查看的是最新测评结果

[2024-08-20 18:24:44]
评测

测评结果：100
用时：305ms
内存：31240kb

查看

[2024-08-20 18:24:43]
提交

answer

#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int MOD=1e9+7;
ll ksm(ll a,ll b=MOD-2) {
	ll ret=1;
	for(;b;a=a*a%MOD,b>>=1) if(b&1) ret=ret*a%MOD;
	return ret;
}
int w(int x) { return x*(x+1)>>1; }
int n,m,o; array<ll,2> dp[155][11505];
signed main() {
	scanf("%d%d",&n,&o),m=w(n);
	dp[0][0][0]=1;
	for(int i=1;i<=n+1;++i) if(i^o) for(int j=0;j<i;++j) for(int k=0;k<=w(n);++k) {
		auto &f=dp[i][k+w(i-j-1)],&g=dp[j][k];
		f[0]=(f[0]-g[0])%MOD,f[1]=(f[1]-g[1]-g[0]*(i-j-1-(j<o&&o<i)))%MOD;
	}
	ll ans=0,inv=ksm(w(n));
	for(int k=0;k<=w(n);++k) {
		ans=(ans+dp[n+1][k][1]*ksm((1+MOD-inv*k%MOD)%MOD))%MOD;
	}
	printf("%lld\n",ans*ksm(n-1)%MOD);
	return 0;
}

Source code, Language: C++17

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 23

Accepted

Test #1:

score: 23

Accepted

time: 1ms

memory: 4036kb

input:

12 2

output:

183756997

result:

ok single line: '183756997'

Test #2:

score: 23

Accepted

time: 1ms

memory: 3988kb

input:

17 6

output:

97571903

result:

ok single line: '97571903'

Test #3:

score: 23

Accepted

time: 0ms

memory: 4012kb

input:

13 3

output:

209826617

result:

ok single line: '209826617'

Test #4:

score: 23

Accepted

time: 0ms

memory: 3996kb

input:

13 8

output:

176038768

result:

ok single line: '176038768'

Test #5:

score: 23

Accepted

time: 1ms

memory: 4080kb

input:

18 4

output:

288404061

result:

ok single line: '288404061'

Test #6:

score: 23

Accepted

time: 0ms

memory: 3972kb

input:

10 10

output:

219657163

result:

ok single line: '219657163'

Test #7:

score: 23

Accepted

time: 1ms

memory: 4072kb

input:

19 15

output:

590577825

result:

ok single line: '590577825'

Test #8:

score: 23

Accepted

time: 0ms

memory: 4044kb

input:

11 6

output:

488143489

result:

ok single line: '488143489'

Test #9:

score: 23

Accepted

time: 0ms

memory: 3992kb

input:

10 5

output:

470594541

result:

ok single line: '470594541'

Test #10:

score: 23

Accepted

time: 0ms

memory: 4148kb

input:

20 5

output:

582458555

result:

ok single line: '582458555'

Test #11:

score: 23

Accepted

time: 1ms

memory: 4112kb

input:

20 12

output:

648081410

result:

ok single line: '648081410'

Test #12:

score: 23

Accepted

time: 1ms

memory: 4108kb

input:

20 4

output:

335777285

result:

ok single line: '335777285'

Test #13:

score: 23

Accepted

time: 1ms

memory: 3972kb

input:

20 15

output:

389216500

result:

ok single line: '389216500'

Test #14:

score: 23

Accepted

time: 0ms

memory: 4028kb

input:

20 16

output:

582458555

result:

ok single line: '582458555'

Test #15:

score: 23

Accepted

time: 1ms

memory: 4080kb

input:

20 19

output:

589126150

result:

ok single line: '589126150'

Test #16:

score: 23

Accepted

time: 0ms

memory: 4108kb

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: 2ms

memory: 5400kb

input:

49 14

output:

486918542

result:

ok single line: '486918542'

Test #18:

score: 34

Accepted

time: 1ms

memory: 4304kb

input:

28 13

output:

642223597

result:

ok single line: '642223597'

Test #19:

score: 34

Accepted

time: 0ms

memory: 4572kb

input:

35 23

output:

842346505

result:

ok single line: '842346505'

Test #20:

score: 34

Accepted

time: 4ms

memory: 5284kb

input:

47 11

output:

583647040

result:

ok single line: '583647040'

Test #21:

score: 34

Accepted

time: 2ms

memory: 4344kb

input:

34 30

output:

990970048

result:

ok single line: '990970048'

Test #22:

score: 34

Accepted

time: 1ms

memory: 4332kb

input:

30 7

output:

393675971

result:

ok single line: '393675971'

Test #23:

score: 34

Accepted

time: 3ms

memory: 4840kb

input:

43 5

output:

737421246

result:

ok single line: '737421246'

Test #24:

score: 34

Accepted

time: 1ms

memory: 4292kb

input:

30 21

output:

254760745

result:

ok single line: '254760745'

Test #25:

score: 34

Accepted

time: 1ms

memory: 4304kb

input:

27 22

output:

266692865

result:

ok single line: '266692865'

Test #26:

score: 34

Accepted

time: 2ms

memory: 4712kb

input:

40 12

output:

133652311

result:

ok single line: '133652311'

Test #27:

score: 34

Accepted

time: 1ms

memory: 4268kb

input:

29 4

output:

873892090

result:

ok single line: '873892090'

Test #28:

score: 34

Accepted

time: 5ms

memory: 5344kb

input:

50 46

output:

267950067

result:

ok single line: '267950067'

Test #29:

score: 34

Accepted

time: 5ms

memory: 5500kb

input:

50 11

output:

423642322

result:

ok single line: '423642322'

Test #30:

score: 34

Accepted

time: 0ms

memory: 5436kb

input:

50 43

output:

625476642

result:

ok single line: '625476642'

Test #31:

score: 34

Accepted

time: 5ms

memory: 5436kb

input:

50 36

output:

767166129

result:

ok single line: '767166129'

Test #32:

score: 34

Accepted

time: 0ms

memory: 5440kb

input:

50 14

output:

357467965

result:

ok single line: '357467965'

Test #33:

score: 34

Accepted

time: 5ms

memory: 5448kb

input:

50 30

output:

219673347

result:

ok single line: '219673347'

Test #34:

score: 34

Accepted

time: 5ms

memory: 5296kb

input:

50 44

output:

392786132

result:

ok single line: '392786132'

Test #35:

score: 34

Accepted

time: 5ms

memory: 5436kb

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: 19ms

memory: 8740kb

input:

75 47

output:

668751416

result:

ok single line: '668751416'

Test #37:

score: 43

Accepted

time: 18ms

memory: 8600kb

input:

75 41

output:

310834114

result:

ok single line: '310834114'

Test #38:

score: 43

Accepted

time: 179ms

memory: 26404kb

input:

133 124

output:

57167600

result:

ok single line: '57167600'

Test #39:

score: 43

Accepted

time: 172ms

memory: 24944kb

input:

129 74

output:

751074385

result:

ok single line: '751074385'

Test #40:

score: 43

Accepted

time: 179ms

memory: 26944kb

input:

135 133

output:

759430862

result:

ok single line: '759430862'

Test #41:

score: 43

Accepted

time: 23ms

memory: 8680kb

input:

75 19

output:

967921272

result:

ok single line: '967921272'

Test #42:

score: 43

Accepted

time: 139ms

memory: 23320kb

input:

124 9

output:

641081661

result:

ok single line: '641081661'

Test #43:

score: 43

Accepted

time: 23ms

memory: 8836kb

input:

76 66

output:

465902083

result:

ok single line: '465902083'

Test #44:

score: 43

Accepted

time: 244ms

memory: 29096kb

input:

142 13

output:

12401929

result:

ok single line: '12401929'

Test #45:

score: 43

Accepted

time: 276ms

memory: 31004kb

input:

150 5

output:

388058135

result:

ok single line: '388058135'

Test #46:

score: 43

Accepted

time: 88ms

memory: 17872kb

input:

109 97

output:

381109644

result:

ok single line: '381109644'

Test #47:

score: 43

Accepted

time: 305ms

memory: 31156kb

input:

150 133

output:

174431234

result:

ok single line: '174431234'

Test #48:

score: 43

Accepted

time: 297ms

memory: 31168kb

input:

150 147

output:

198921722

result:

ok single line: '198921722'

Test #49:

score: 43

Accepted

time: 290ms

memory: 31240kb

input:

150 142

output:

631473185

result:

ok single line: '631473185'

Test #50:

score: 43

Accepted

time: 304ms

memory: 31224kb

input:

150 136

output:

743180069

result:

ok single line: '743180069'

Test #51:

score: 43

Accepted

time: 295ms

memory: 31144kb

input:

150 138

output:

621574340

result:

ok single line: '621574340'

Test #52:

score: 43

Accepted

time: 300ms

memory: 31232kb

input:

150 119

output:

872660153

result:

ok single line: '872660153'

Test #53:

score: 43

Accepted

time: 302ms

memory: 31220kb

input:

150 144

output:

939939060

result:

ok single line: '939939060'

Test #54:

score: 43

Accepted

time: 297ms

memory: 30992kb

input:

150 1

output:

166208360

result:

ok single line: '166208360'

Test #55:

score: 43

Accepted

time: 288ms

memory: 31128kb

input:

150 75

output:

353929212

result:

ok single line: '353929212'