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QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #35966 | #2115. Od deski do deski [A] | Gemini7X | 10 ✓ | 32ms | 42772kb | C++20 | 808b | 2022-06-21 12:05:58 | 2022-06-21 12:05:59 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+7;
int add(int a,int b){return a+b>=mod?a+b-mod:a+b;}
int dec(int a,int b){return a-b<0?a-b+mod:a-b;}
int mul(int a,int b){return 1ll*a*b%mod;}
int ksm(int a,int b=mod-2){int ret=1;for(;b;b>>=1,a=mul(a,a))if(b&1)ret=mul(ret,a);return ret;}
int n,m,f[3005][3005][2],ans;
int main(){
cin>>n>>m;
f[0][0][1]=1;
for(int i=0;i<n;i++){
for(int j=0;j<=i;j++){
if(f[i][j][1]){
f[i+1][j][1]=add(f[i+1][j][1],mul(f[i][j][1],j));
f[i+1][j+1][0]=add(f[i+1][j+1][0],mul(f[i][j][1],dec(m,j)));
}
if(f[i][j][0]){
f[i+1][j][1]=add(f[i+1][j][1],mul(f[i][j][0],j));
f[i+1][j][0]=add(f[i+1][j][0],mul(f[i][j][0],dec(m,j)));
}
}
}
for(int i=0;i<=n;i++)ans=add(ans,f[n][i][1]);
cout<<ans;
return 0;
}
Details
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Subtask #1:
score: 1
Accepted
Test #1:
score: 1
Accepted
time: 2ms
memory: 3716kb
input:
4 2
output:
10
result:
ok single line: '10'
Test #2:
score: 0
Accepted
time: 2ms
memory: 3556kb
input:
1 1
output:
0
result:
ok single line: '0'
Test #3:
score: 0
Accepted
time: 2ms
memory: 3556kb
input:
1 3
output:
0
result:
ok single line: '0'
Test #4:
score: 0
Accepted
time: 2ms
memory: 3632kb
input:
1 5
output:
0
result:
ok single line: '0'
Test #5:
score: 0
Accepted
time: 2ms
memory: 3496kb
input:
2 2
output:
2
result:
ok single line: '2'
Test #6:
score: 0
Accepted
time: 0ms
memory: 3576kb
input:
2 4
output:
4
result:
ok single line: '4'
Test #7:
score: 0
Accepted
time: 2ms
memory: 3600kb
input:
3 1
output:
1
result:
ok single line: '1'
Test #8:
score: 0
Accepted
time: 2ms
memory: 3712kb
input:
3 3
output:
9
result:
ok single line: '9'
Test #9:
score: 0
Accepted
time: 2ms
memory: 3588kb
input:
3 5
output:
25
result:
ok single line: '25'
Test #10:
score: 0
Accepted
time: 2ms
memory: 3572kb
input:
4 2
output:
10
result:
ok single line: '10'
Test #11:
score: 0
Accepted
time: 0ms
memory: 3656kb
input:
4 4
output:
76
result:
ok single line: '76'
Test #12:
score: 0
Accepted
time: 1ms
memory: 3604kb
input:
5 1
output:
1
result:
ok single line: '1'
Test #13:
score: 0
Accepted
time: 2ms
memory: 3552kb
input:
5 3
output:
117
result:
ok single line: '117'
Test #14:
score: 0
Accepted
time: 2ms
memory: 3552kb
input:
5 5
output:
825
result:
ok single line: '825'
Test #15:
score: 0
Accepted
time: 2ms
memory: 3584kb
input:
7 2
output:
116
result:
ok single line: '116'
Test #16:
score: 0
Accepted
time: 2ms
memory: 3692kb
input:
9 2
output:
496
result:
ok single line: '496'
Test #17:
score: 0
Accepted
time: 2ms
memory: 3612kb
input:
11 2
output:
2028
result:
ok single line: '2028'
Test #18:
score: 0
Accepted
time: 2ms
memory: 3604kb
input:
13 2
output:
8168
result:
ok single line: '8168'
Test #19:
score: 0
Accepted
time: 2ms
memory: 3472kb
input:
10 3
output:
48237
result:
ok single line: '48237'
Subtask #2:
score: 1
Accepted
Test #20:
score: 1
Accepted
time: 2ms
memory: 3532kb
input:
1 2
output:
0
result:
ok single line: '0'
Test #21:
score: 0
Accepted
time: 2ms
memory: 3536kb
input:
1 4
output:
0
result:
ok single line: '0'
Test #22:
score: 0
Accepted
time: 1ms
memory: 3560kb
input:
2 1
output:
1
result:
ok single line: '1'
Test #23:
score: 0
Accepted
time: 2ms
memory: 3496kb
input:
2 3
output:
3
result:
ok single line: '3'
Test #24:
score: 0
Accepted
time: 2ms
memory: 3568kb
input:
2 5
output:
5
result:
ok single line: '5'
Test #25:
score: 0
Accepted
time: 2ms
memory: 3572kb
input:
3 2
output:
4
result:
ok single line: '4'
Test #26:
score: 0
Accepted
time: 1ms
memory: 3652kb
input:
3 4
output:
16
result:
ok single line: '16'
Test #27:
score: 0
Accepted
time: 2ms
memory: 3588kb
input:
4 1
output:
1
result:
ok single line: '1'
Test #28:
score: 0
Accepted
time: 2ms
memory: 3576kb
input:
4 3
output:
33
result:
ok single line: '33'
Test #29:
score: 0
Accepted
time: 1ms
memory: 3684kb
input:
4 5
output:
145
result:
ok single line: '145'
Test #30:
score: 0
Accepted
time: 2ms
memory: 3604kb
input:
5 2
output:
24
result:
ok single line: '24'
Test #31:
score: 0
Accepted
time: 0ms
memory: 3572kb
input:
5 4
output:
352
result:
ok single line: '352'
Test #32:
score: 0
Accepted
time: 2ms
memory: 3556kb
input:
6 2
output:
54
result:
ok single line: '54'
Test #33:
score: 0
Accepted
time: 2ms
memory: 3696kb
input:
8 2
output:
242
result:
ok single line: '242'
Test #34:
score: 0
Accepted
time: 1ms
memory: 3596kb
input:
10 2
output:
1006
result:
ok single line: '1006'
Test #35:
score: 0
Accepted
time: 2ms
memory: 3604kb
input:
12 2
output:
4074
result:
ok single line: '4074'
Test #36:
score: 0
Accepted
time: 0ms
memory: 3640kb
input:
14 2
output:
16358
result:
ok single line: '16358'
Subtask #3:
score: 1
Accepted
Test #37:
score: 1
Accepted
time: 3ms
memory: 20504kb
input:
1689 2
output:
998472085
result:
ok single line: '998472085'
Test #38:
score: 0
Accepted
time: 4ms
memory: 24784kb
input:
2748 2
output:
451726470
result:
ok single line: '451726470'
Test #39:
score: 0
Accepted
time: 4ms
memory: 18720kb
input:
1204 2
output:
449822862
result:
ok single line: '449822862'
Test #40:
score: 0
Accepted
time: 1ms
memory: 24568kb
input:
2727 2
output:
203224669
result:
ok single line: '203224669'
Test #41:
score: 0
Accepted
time: 2ms
memory: 17688kb
input:
984 2
output:
175698237
result:
ok single line: '175698237'
Test #42:
score: 0
Accepted
time: 13ms
memory: 25868kb
input:
3000 2
output:
165694478
result:
ok single line: '165694478'
Subtask #4:
score: 1
Accepted
Test #43:
score: 1
Accepted
time: 1ms
memory: 5852kb
input:
97 83
output:
613159502
result:
ok single line: '613159502'
Test #44:
score: 0
Accepted
time: 3ms
memory: 6056kb
input:
109 112
output:
749531455
result:
ok single line: '749531455'
Test #45:
score: 0
Accepted
time: 0ms
memory: 7680kb
input:
92 84
output:
754509307
result:
ok single line: '754509307'
Test #46:
score: 0
Accepted
time: 3ms
memory: 5692kb
input:
111 116
output:
434377961
result:
ok single line: '434377961'
Test #47:
score: 0
Accepted
time: 3ms
memory: 5740kb
input:
95 82
output:
345936119
result:
ok single line: '345936119'
Test #48:
score: 0
Accepted
time: 2ms
memory: 7820kb
input:
106 94
output:
551192069
result:
ok single line: '551192069'
Test #49:
score: 0
Accepted
time: 3ms
memory: 5812kb
input:
110 94
output:
41938476
result:
ok single line: '41938476'
Subtask #5:
score: 1
Accepted
Test #50:
score: 1
Accepted
time: 3ms
memory: 20440kb
input:
1168 346407973
output:
112579949
result:
ok single line: '112579949'
Test #51:
score: 0
Accepted
time: 2ms
memory: 10192kb
input:
313 68910142
output:
83916341
result:
ok single line: '83916341'
Test #52:
score: 0
Accepted
time: 2ms
memory: 7828kb
input:
161 64396010
output:
499230829
result:
ok single line: '499230829'
Test #53:
score: 0
Accepted
time: 7ms
memory: 26932kb
input:
1836 434479347
output:
873178296
result:
ok single line: '873178296'
Test #54:
score: 0
Accepted
time: 16ms
memory: 23060kb
input:
1588 392
output:
611721416
result:
ok single line: '611721416'
Subtask #6:
score: 1
Accepted
Test #55:
score: 1
Accepted
time: 1ms
memory: 5804kb
input:
123 468402382
output:
827499041
result:
ok single line: '827499041'
Test #56:
score: 0
Accepted
time: 5ms
memory: 19108kb
input:
1016 982915840
output:
813922878
result:
ok single line: '813922878'
Test #57:
score: 0
Accepted
time: 3ms
memory: 16928kb
input:
709 58889328
output:
215179237
result:
ok single line: '215179237'
Test #58:
score: 0
Accepted
time: 2ms
memory: 18176kb
input:
884 504516691
output:
199072709
result:
ok single line: '199072709'
Test #59:
score: 0
Accepted
time: 6ms
memory: 20280kb
input:
1414 131
output:
292793609
result:
ok single line: '292793609'
Subtask #7:
score: 1
Accepted
Test #60:
score: 1
Accepted
time: 2ms
memory: 17476kb
input:
779 140176290
output:
438118426
result:
ok single line: '438118426'
Test #61:
score: 0
Accepted
time: 0ms
memory: 15880kb
input:
488 292223807
output:
720591335
result:
ok single line: '720591335'
Test #62:
score: 0
Accepted
time: 4ms
memory: 17900kb
input:
849 198249514
output:
936832149
result:
ok single line: '936832149'
Test #63:
score: 0
Accepted
time: 9ms
memory: 18560kb
input:
929 316667619
output:
684900471
result:
ok single line: '684900471'
Test #64:
score: 0
Accepted
time: 3ms
memory: 20140kb
input:
1282 216
output:
39918106
result:
ok single line: '39918106'
Subtask #8:
score: 1
Accepted
Test #65:
score: 1
Accepted
time: 9ms
memory: 32840kb
input:
2315 21373850
output:
692830582
result:
ok single line: '692830582'
Test #66:
score: 0
Accepted
time: 12ms
memory: 39912kb
input:
2819 54930015
output:
704850526
result:
ok single line: '704850526'
Test #67:
score: 0
Accepted
time: 22ms
memory: 40832kb
input:
2876 518453378
output:
160061956
result:
ok single line: '160061956'
Test #68:
score: 0
Accepted
time: 13ms
memory: 38588kb
input:
2722 126086649
output:
930849830
result:
ok single line: '930849830'
Test #69:
score: 0
Accepted
time: 18ms
memory: 35612kb
input:
2508 121810583
output:
5167845
result:
ok single line: '5167845'
Test #70:
score: 0
Accepted
time: 13ms
memory: 35492kb
input:
2500 4000
output:
805467400
result:
ok single line: '805467400'
Subtask #9:
score: 1
Accepted
Test #71:
score: 1
Accepted
time: 15ms
memory: 37020kb
input:
2631 684393357
output:
936211679
result:
ok single line: '936211679'
Test #72:
score: 0
Accepted
time: 24ms
memory: 41464kb
input:
2913 516585428
output:
664802101
result:
ok single line: '664802101'
Test #73:
score: 0
Accepted
time: 19ms
memory: 42236kb
input:
2966 566883908
output:
74800796
result:
ok single line: '74800796'
Test #74:
score: 0
Accepted
time: 24ms
memory: 35488kb
input:
2508 135568838
output:
345174594
result:
ok single line: '345174594'
Test #75:
score: 0
Accepted
time: 24ms
memory: 41932kb
input:
2948 557406795
output:
163500664
result:
ok single line: '163500664'
Test #76:
score: 0
Accepted
time: 15ms
memory: 34856kb
input:
2500 1000
output:
996821828
result:
ok single line: '996821828'
Subtask #10:
score: 1
Accepted
Test #77:
score: 1
Accepted
time: 26ms
memory: 42772kb
input:
3000 1000000000
output:
543073891
result:
ok single line: '543073891'
Test #78:
score: 0
Accepted
time: 32ms
memory: 42624kb
input:
3000 999999999
output:
453659722
result:
ok single line: '453659722'
Test #79:
score: 0
Accepted
time: 22ms
memory: 42716kb
input:
3000 999999998
output:
98366752
result:
ok single line: '98366752'
Test #80:
score: 0
Accepted
time: 22ms
memory: 42764kb
input:
2999 1000000000
output:
282559837
result:
ok single line: '282559837'
Test #81:
score: 0
Accepted
time: 17ms
memory: 42620kb
input:
2999 999999999
output:
720365773
result:
ok single line: '720365773'
Test #82:
score: 0
Accepted
time: 17ms
memory: 42764kb
input:
2999 999999998
output:
461705162
result:
ok single line: '461705162'
Test #83:
score: 0
Accepted
time: 8ms
memory: 42580kb
input:
2998 1000000000
output:
842668451
result:
ok single line: '842668451'
Test #84:
score: 0
Accepted
time: 32ms
memory: 42744kb
input:
2998 999999999
output:
304660083
result:
ok single line: '304660083'
Test #85:
score: 0
Accepted
time: 25ms
memory: 42628kb
input:
2998 999999998
output:
92840037
result:
ok single line: '92840037'
Test #86:
score: 0
Accepted
time: 4ms
memory: 25780kb
input:
3000 1
output:
1
result:
ok single line: '1'
Test #87:
score: 0
Accepted
time: 18ms
memory: 27660kb
input:
3000 100
output:
513574771
result:
ok single line: '513574771'