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QOJ
| 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 |
|---|---|---|---|---|---|---|---|---|---|
| #226170 | #5532. Kangaroo | Spouter_27 | 100 ✓ | 5ms | 35092kb | C++14 | 661b | 2023-10-25 17:32:15 | 2023-10-25 17:32:16 |
Judging History
answer
/********************
* author:Spouter_27
* place:spst Alego
* with:marmoreal_777
******************/
#include<bits/stdc++.h>
using namespace std;
//#define int long long
typedef long long ll;
const ll N=2e3+10,mod=1e9+7;
ll n,s,t,f[N][N];
void work(){
scanf("%lld %lld %lld",&n,&s,&t);
f[0][0]=1;
for(int i=1;i<=n;i++){
for(int j=1;j<=i;j++){
if(i!=s&&i!=t){
f[i][j]=f[i-1][j-1]*(j-(i>s)-(i>t))+f[i-1][j+1]*j;
}
else{
f[i][j]=f[i-1][j-1]+f[i-1][j];
}
f[i][j]%=mod;
}
}
printf("%lld\n",f[n][1]);
}
signed main(){
ll T=1;
while(T--){
work();
}
return 0;
}
/*
exSample:
*/
详细
Subtask #1:
score: 6
Accepted
Test #1:
score: 6
Accepted
time: 0ms
memory: 3960kb
input:
7 3 6
output:
14
result:
ok 1 number(s): "14"
Subtask #2:
score: 30
Accepted
Dependency #1:
100%
Accepted
Test #2:
score: 30
Accepted
time: 1ms
memory: 6172kb
input:
39 36 32
output:
964903316
result:
ok 1 number(s): "964903316"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3900kb
input:
26 1 26
output:
955348527
result:
ok 1 number(s): "955348527"
Test #4:
score: 0
Accepted
time: 0ms
memory: 4016kb
input:
40 11 33
output:
695661890
result:
ok 1 number(s): "695661890"
Test #5:
score: 0
Accepted
time: 0ms
memory: 4100kb
input:
39 39 38
output:
717149364
result:
ok 1 number(s): "717149364"
Test #6:
score: 0
Accepted
time: 1ms
memory: 6008kb
input:
40 10 25
output:
912929610
result:
ok 1 number(s): "912929610"
Test #7:
score: 0
Accepted
time: 0ms
memory: 4004kb
input:
37 25 23
output:
250748685
result:
ok 1 number(s): "250748685"
Test #8:
score: 0
Accepted
time: 0ms
memory: 4000kb
input:
39 2 38
output:
624060592
result:
ok 1 number(s): "624060592"
Test #9:
score: 0
Accepted
time: 1ms
memory: 5980kb
input:
40 18 22
output:
739993796
result:
ok 1 number(s): "739993796"
Test #10:
score: 0
Accepted
time: 0ms
memory: 3960kb
input:
40 11 35
output:
135213497
result:
ok 1 number(s): "135213497"
Subtask #3:
score: 15
Accepted
Dependency #1:
100%
Accepted
Dependency #2:
100%
Accepted
Test #11:
score: 15
Accepted
time: 1ms
memory: 8332kb
input:
199 100 70
output:
914653136
result:
ok 1 number(s): "914653136"
Test #12:
score: 0
Accepted
time: 1ms
memory: 8012kb
input:
187 3 40
output:
928785584
result:
ok 1 number(s): "928785584"
Test #13:
score: 0
Accepted
time: 1ms
memory: 7948kb
input:
199 198 197
output:
38412688
result:
ok 1 number(s): "38412688"
Test #14:
score: 0
Accepted
time: 1ms
memory: 6272kb
input:
200 40 140
output:
367088143
result:
ok 1 number(s): "367088143"
Test #15:
score: 0
Accepted
time: 1ms
memory: 8228kb
input:
199 111 3
output:
870834793
result:
ok 1 number(s): "870834793"
Test #16:
score: 0
Accepted
time: 0ms
memory: 8096kb
input:
200 133 73
output:
343127012
result:
ok 1 number(s): "343127012"
Test #17:
score: 0
Accepted
time: 1ms
memory: 8220kb
input:
178 15 163
output:
160852284
result:
ok 1 number(s): "160852284"
Test #18:
score: 0
Accepted
time: 1ms
memory: 6352kb
input:
197 43 79
output:
332057544
result:
ok 1 number(s): "332057544"
Test #19:
score: 0
Accepted
time: 0ms
memory: 6284kb
input:
200 33 79
output:
742545318
result:
ok 1 number(s): "742545318"
Subtask #4:
score: 49
Accepted
Dependency #1:
100%
Accepted
Dependency #2:
100%
Accepted
Dependency #3:
100%
Accepted
Test #20:
score: 49
Accepted
time: 0ms
memory: 14216kb
input:
658 169 438
output:
206087110
result:
ok 1 number(s): "206087110"
Test #21:
score: 0
Accepted
time: 2ms
memory: 14532kb
input:
700 207 509
output:
478311263
result:
ok 1 number(s): "478311263"
Test #22:
score: 0
Accepted
time: 2ms
memory: 14724kb
input:
755 139 507
output:
103783948
result:
ok 1 number(s): "103783948"
Test #23:
score: 0
Accepted
time: 3ms
memory: 34404kb
input:
2000 500 1500
output:
123410309
result:
ok 1 number(s): "123410309"
Test #24:
score: 0
Accepted
time: 0ms
memory: 34240kb
input:
2000 1000 1001
output:
956197482
result:
ok 1 number(s): "956197482"
Test #25:
score: 0
Accepted
time: 3ms
memory: 33888kb
input:
2000 666 1333
output:
993781645
result:
ok 1 number(s): "993781645"
Test #26:
score: 0
Accepted
time: 3ms
memory: 35092kb
input:
1991 198 677
output:
155058730
result:
ok 1 number(s): "155058730"
Test #27:
score: 0
Accepted
time: 5ms
memory: 28772kb
input:
1498 299 659
output:
665757882
result:
ok 1 number(s): "665757882"