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#18188#2115. Od deski do deski [A]qingyu_orz10 ✓41ms70528kbC++14540b2022-01-16 17:25:482022-05-04 17:18:15

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你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2022-05-04 17:18:15]
  • 评测
  • 测评结果：10
  • 用时：41ms
  • 内存：70528kb
查看
  • [2022-01-16 17:25:48]
  • 提交

answer

#include<bits/stdc++.h>
#define mod 1000000007
using namespace std;
int n,m;
int f[2][3005][3005];
void Add(int* a,int x){
	*a+=x;
	if((*a)>=mod)*a-=mod;
}
int main(){
	cin>>n>>m;
	f[0][1][1]=m%mod;
	for(int i=1;i<n;++i)for(int j=0;j<=i&&j<=m;++j){
		f[1][i+1][j]=(f[1][i+1][j]+1ll*(f[0][i][j]+f[1][i][j])*j)%mod;
		f[0][i+1][j+1]=(f[0][i+1][j+1]+1ll*f[1][i][j]*(m-j))%mod;
		f[0][i+1][j]=(f[0][i+1][j]+1ll*f[0][i][j]*(m-j))%mod;
	}
	int ans=0;
	for(int i=0;i<=n;++i)Add(&ans,f[1][n][i]);
	cout<<ans<<endl;
	return 0;
}
源文件, 语言: C++14

详细

Subtask #1:

score: 1
Accepted

Test #1:

score: 1
Accepted
time: 4ms
memory: 5636kb

input:

4 2

output:

10

result:

ok single line: '10'

Test #2:

score: 0
Accepted
time: 1ms
memory: 3596kb

input:

1 1

output:

0

result:

ok single line: '0'

Test #3:

score: 0
Accepted
time: 0ms
memory: 3656kb

input:

1 3

output:

0

result:

ok single line: '0'

Test #4:

score: 0
Accepted
time: 2ms
memory: 3664kb

input:

1 5

output:

0

result:

ok single line: '0'

Test #5:

score: 0
Accepted
time: 3ms
memory: 5740kb

input:

2 2

output:

2

result:

ok single line: '2'

Test #6:

score: 0
Accepted
time: 3ms
memory: 5584kb

input:

2 4

output:

4

result:

ok single line: '4'

Test #7:

score: 0
Accepted
time: 3ms
memory: 7828kb

input:

3 1

output:

1

result:

ok single line: '1'

Test #8:

score: 0
Accepted
time: 2ms
memory: 5604kb

input:

3 3

output:

9

result:

ok single line: '9'

Test #9:

score: 0
Accepted
time: 2ms
memory: 5652kb

input:

3 5

output:

25

result:

ok single line: '25'

Test #10:

score: 0
Accepted
time: 3ms
memory: 5724kb

input:

4 2

output:

10

result:

ok single line: '10'

Test #11:

score: 0
Accepted
time: 3ms
memory: 5652kb

input:

4 4

output:

76

result:

ok single line: '76'

Test #12:

score: 0
Accepted
time: 2ms
memory: 5656kb

input:

5 1

output:

1

result:

ok single line: '1'

Test #13:

score: 0
Accepted
time: 3ms
memory: 5636kb

input:

5 3

output:

117

result:

ok single line: '117'

Test #14:

score: 0
Accepted
time: 3ms
memory: 5668kb

input:

5 5

output:

825

result:

ok single line: '825'

Test #15:

score: 0
Accepted
time: 3ms
memory: 5664kb

input:

7 2

output:

116

result:

ok single line: '116'

Test #16:

score: 0
Accepted
time: 3ms
memory: 5652kb

input:

9 2

output:

496

result:

ok single line: '496'

Test #17:

score: 0
Accepted
time: 3ms
memory: 5752kb

input:

11 2

output:

2028

result:

ok single line: '2028'

Test #18:

score: 0
Accepted
time: 3ms
memory: 5756kb

input:

13 2

output:

8168

result:

ok single line: '8168'

Test #19:

score: 0
Accepted
time: 0ms
memory: 5544kb

input:

10 3

output:

48237

result:

ok single line: '48237'

Subtask #2:

score: 1
Accepted

Test #20:

score: 1
Accepted
time: 1ms
memory: 3688kb

input:

1 2

output:

0

result:

ok single line: '0'

Test #21:

score: 0
Accepted
time: 3ms
memory: 3572kb

input:

1 4

output:

0

result:

ok single line: '0'

Test #22:

score: 0
Accepted
time: 0ms
memory: 5620kb

input:

2 1

output:

1

result:

ok single line: '1'

Test #23:

score: 0
Accepted
time: 0ms
memory: 5628kb

input:

2 3

output:

3

result:

ok single line: '3'

Test #24:

score: 0
Accepted
time: 0ms
memory: 5740kb

input:

2 5

output:

5

result:

ok single line: '5'

Test #25:

score: 0
Accepted
time: 0ms
memory: 5780kb

input:

3 2

output:

4

result:

ok single line: '4'

Test #26:

score: 0
Accepted
time: 3ms
memory: 5648kb

input:

3 4

output:

16

result:

ok single line: '16'

Test #27:

score: 0
Accepted
time: 3ms
memory: 5520kb

input:

4 1

output:

1

result:

ok single line: '1'

Test #28:

score: 0
Accepted
time: 3ms
memory: 5624kb

input:

4 3

output:

33

result:

ok single line: '33'

Test #29:

score: 0
Accepted
time: 3ms
memory: 5784kb

input:

4 5

output:

145

result:

ok single line: '145'

Test #30:

score: 0
Accepted
time: 3ms
memory: 5524kb

input:

5 2

output:

24

result:

ok single line: '24'

Test #31:

score: 0
Accepted
time: 3ms
memory: 5728kb

input:

5 4

output:

352

result:

ok single line: '352'

Test #32:

score: 0
Accepted
time: 3ms
memory: 5720kb

input:

6 2

output:

54

result:

ok single line: '54'

Test #33:

score: 0
Accepted
time: 4ms
memory: 7696kb

input:

8 2

output:

242

result:

ok single line: '242'

Test #34:

score: 0
Accepted
time: 2ms
memory: 5812kb

input:

10 2

output:

1006

result:

ok single line: '1006'

Test #35:

score: 0
Accepted
time: 3ms
memory: 5552kb

input:

12 2

output:

4074

result:

ok single line: '4074'

Test #36:

score: 0
Accepted
time: 1ms
memory: 5760kb

input:

14 2

output:

16358

result:

ok single line: '16358'

Subtask #3:

score: 1
Accepted

Test #37:

score: 1
Accepted
time: 2ms
memory: 33716kb

input:

1689 2

output:

998472085

result:

ok single line: '998472085'

Test #38:

score: 0
Accepted
time: 17ms
memory: 42060kb

input:

2748 2

output:

451726470

result:

ok single line: '451726470'

Test #39:

score: 0
Accepted
time: 4ms
memory: 30176kb

input:

1204 2

output:

449822862

result:

ok single line: '449822862'

Test #40:

score: 0
Accepted
time: 2ms
memory: 42096kb

input:

2727 2

output:

203224669

result:

ok single line: '203224669'

Test #41:

score: 0
Accepted
time: 3ms
memory: 28224kb

input:

984 2

output:

175698237

result:

ok single line: '175698237'

Test #42:

score: 0
Accepted
time: 0ms
memory: 43856kb

input:

3000 2

output:

165694478

result:

ok single line: '165694478'

Subtask #4:

score: 1
Accepted

Test #43:

score: 1
Accepted
time: 4ms
memory: 6128kb

input:

97 83

output:

613159502

result:

ok single line: '613159502'

Test #44:

score: 0
Accepted
time: 2ms
memory: 10060kb

input:

109 112

output:

749531455

result:

ok single line: '749531455'

Test #45:

score: 0
Accepted
time: 0ms
memory: 9908kb

input:

92 84

output:

754509307

result:

ok single line: '754509307'

Test #46:

score: 0
Accepted
time: 5ms
memory: 8136kb

input:

111 116

output:

434377961

result:

ok single line: '434377961'

Test #47:

score: 0
Accepted
time: 5ms
memory: 10072kb

input:

95 82

output:

345936119

result:

ok single line: '345936119'

Test #48:

score: 0
Accepted
time: 4ms
memory: 9964kb

input:

106 94

output:

551192069

result:

ok single line: '551192069'

Test #49:

score: 0
Accepted
time: 2ms
memory: 10144kb

input:

110 94

output:

41938476

result:

ok single line: '41938476'

Subtask #5:

score: 1
Accepted

Test #50:

score: 1
Accepted
time: 7ms
memory: 30812kb

input:

1168 346407973

output:

112579949

result:

ok single line: '112579949'

Test #51:

score: 0
Accepted
time: 2ms
memory: 12440kb

input:

313 68910142

output:

83916341

result:

ok single line: '83916341'

Test #52:

score: 0
Accepted
time: 5ms
memory: 10028kb

input:

161 64396010

output:

499230829

result:

ok single line: '499230829'

Test #53:

score: 0
Accepted
time: 8ms
memory: 44340kb

input:

1836 434479347

output:

873178296

result:

ok single line: '873178296'

Test #54:

score: 0
Accepted
time: 9ms
memory: 34124kb

input:

1588 392

output:

611721416

result:

ok single line: '611721416'

Subtask #6:

score: 1
Accepted

Test #55:

score: 1
Accepted
time: 4ms
memory: 8204kb

input:

123 468402382

output:

827499041

result:

ok single line: '827499041'

Test #56:

score: 0
Accepted
time: 2ms
memory: 28768kb

input:

1016 982915840

output:

813922878

result:

ok single line: '813922878'

Test #57:

score: 0
Accepted
time: 2ms
memory: 22272kb

input:

709 58889328

output:

215179237

result:

ok single line: '215179237'

Test #58:

score: 0
Accepted
time: 4ms
memory: 28364kb

input:

884 504516691

output:

199072709

result:

ok single line: '199072709'

Test #59:

score: 0
Accepted
time: 4ms
memory: 31724kb

input:

1414 131

output:

292793609

result:

ok single line: '292793609'

Subtask #7:

score: 1
Accepted

Test #60:

score: 1
Accepted
time: 8ms
memory: 26528kb

input:

779 140176290

output:

438118426

result:

ok single line: '438118426'

Test #61:

score: 0
Accepted
time: 3ms
memory: 16120kb

input:

488 292223807

output:

720591335

result:

ok single line: '720591335'

Test #62:

score: 0
Accepted
time: 1ms
memory: 26520kb

input:

849 198249514

output:

936832149

result:

ok single line: '936832149'

Test #63:

score: 0
Accepted
time: 2ms
memory: 26836kb

input:

929 316667619

output:

684900471

result:

ok single line: '684900471'

Test #64:

score: 0
Accepted
time: 2ms
memory: 30608kb

input:

1282 216

output:

39918106

result:

ok single line: '39918106'

Subtask #8:

score: 1
Accepted

Test #65:

score: 1
Accepted
time: 17ms
memory: 55512kb

input:

2315 21373850

output:

692830582

result:

ok single line: '692830582'

Test #66:

score: 0
Accepted
time: 12ms
memory: 66756kb

input:

2819 54930015

output:

704850526

result:

ok single line: '704850526'

Test #67:

score: 0
Accepted
time: 32ms
memory: 68380kb

input:

2876 518453378

output:

160061956

result:

ok single line: '160061956'

Test #68:

score: 0
Accepted
time: 20ms
memory: 65244kb

input:

2722 126086649

output:

930849830

result:

ok single line: '930849830'

Test #69:

score: 0
Accepted
time: 16ms
memory: 59024kb

input:

2508 121810583

output:

5167845

result:

ok single line: '5167845'

Test #70:

score: 0
Accepted
time: 28ms
memory: 58820kb

input:

2500 4000

output:

805467400

result:

ok single line: '805467400'

Subtask #9:

score: 1
Accepted

Test #71:

score: 1
Accepted
time: 17ms
memory: 63088kb

input:

2631 684393357

output:

936211679

result:

ok single line: '936211679'

Test #72:

score: 0
Accepted
time: 35ms
memory: 68460kb

input:

2913 516585428

output:

664802101

result:

ok single line: '664802101'

Test #73:

score: 0
Accepted
time: 24ms
memory: 69540kb

input:

2966 566883908

output:

74800796

result:

ok single line: '74800796'

Test #74:

score: 0
Accepted
time: 17ms
memory: 59088kb

input:

2508 135568838

output:

345174594

result:

ok single line: '345174594'

Test #75:

score: 0
Accepted
time: 37ms
memory: 69692kb

input:

2948 557406795

output:

163500664

result:

ok single line: '163500664'

Test #76:

score: 0
Accepted
time: 11ms
memory: 51488kb

input:

2500 1000

output:

996821828

result:

ok single line: '996821828'

Subtask #10:

score: 1
Accepted

Test #77:

score: 1
Accepted
time: 32ms
memory: 69868kb

input:

3000 1000000000

output:

543073891

result:

ok single line: '543073891'

Test #78:

score: 0
Accepted
time: 29ms
memory: 69956kb

input:

3000 999999999

output:

453659722

result:

ok single line: '453659722'

Test #79:

score: 0
Accepted
time: 11ms
memory: 70528kb

input:

3000 999999998

output:

98366752

result:

ok single line: '98366752'

Test #80:

score: 0
Accepted
time: 16ms
memory: 69852kb

input:

2999 1000000000

output:

282559837

result:

ok single line: '282559837'

Test #81:

score: 0
Accepted
time: 23ms
memory: 69924kb

input:

2999 999999999

output:

720365773

result:

ok single line: '720365773'

Test #82:

score: 0
Accepted
time: 41ms
memory: 69852kb

input:

2999 999999998

output:

461705162

result:

ok single line: '461705162'

Test #83:

score: 0
Accepted
time: 36ms
memory: 69976kb

input:

2998 1000000000

output:

842668451

result:

ok single line: '842668451'

Test #84:

score: 0
Accepted
time: 8ms
memory: 69920kb

input:

2998 999999999

output:

304660083

result:

ok single line: '304660083'

Test #85:

score: 0
Accepted
time: 25ms
memory: 69776kb

input:

2998 999999998

output:

92840037

result:

ok single line: '92840037'

Test #86:

score: 0
Accepted
time: 4ms
memory: 43692kb

input:

3000 1

output:

1

result:

ok single line: '1'

Test #87:

score: 0
Accepted
time: 8ms
memory: 45320kb

input:

3000 100

output:

513574771

result:

ok single line: '513574771'
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