#include <bits/stdc++.h>
#define MOD 1000000007
using namespace std;
long long N, cs, cf, dp[2500][2500];
int main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin>>N>>cs>>cf;
dp[0][0]=1;
for(int i=1; i<=N; i++) {
for(int j=1; j<=N; j++) {
if(i==cs||i==cf) {
dp[i][j]=dp[i-1][j]+dp[i-1][j-1];
}
else dp[i][j]=max((j-(i>cs)-(i>cf)), 0)*dp[i-1][j-1]+j*dp[i-1][j+1];
dp[i][j]%=MOD;
}
}
cout<<dp[N][1];
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
340 KB |
Output is correct |
| 3 |
Correct |
0 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
468 KB |
Output is correct |
| 5 |
Correct |
1 ms |
468 KB |
Output is correct |
| 6 |
Correct |
0 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
468 KB |
Output is correct |
| 8 |
Correct |
0 ms |
468 KB |
Output is correct |
| 9 |
Correct |
0 ms |
468 KB |
Output is correct |
| 10 |
Correct |
0 ms |
468 KB |
Output is correct |
| 11 |
Correct |
0 ms |
468 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
340 KB |
Output is correct |
| 3 |
Correct |
0 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
468 KB |
Output is correct |
| 5 |
Correct |
1 ms |
468 KB |
Output is correct |
| 6 |
Correct |
0 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
468 KB |
Output is correct |
| 8 |
Correct |
0 ms |
468 KB |
Output is correct |
| 9 |
Correct |
0 ms |
468 KB |
Output is correct |
| 10 |
Correct |
0 ms |
468 KB |
Output is correct |
| 11 |
Correct |
0 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 13 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 14 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 15 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 16 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 17 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 18 |
Correct |
1 ms |
1244 KB |
Output is correct |
| 19 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 20 |
Correct |
1 ms |
1364 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
340 KB |
Output is correct |
| 3 |
Correct |
0 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
468 KB |
Output is correct |
| 5 |
Correct |
1 ms |
468 KB |
Output is correct |
| 6 |
Correct |
0 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
468 KB |
Output is correct |
| 8 |
Correct |
0 ms |
468 KB |
Output is correct |
| 9 |
Correct |
0 ms |
468 KB |
Output is correct |
| 10 |
Correct |
0 ms |
468 KB |
Output is correct |
| 11 |
Correct |
0 ms |
468 KB |
Output is correct |
| 12 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 13 |
Correct |
1 ms |
1236 KB |
Output is correct |
| 14 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 15 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 16 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 17 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 18 |
Correct |
1 ms |
1244 KB |
Output is correct |
| 19 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 20 |
Correct |
1 ms |
1364 KB |
Output is correct |
| 21 |
Correct |
3 ms |
6356 KB |
Output is correct |
| 22 |
Correct |
5 ms |
6868 KB |
Output is correct |
| 23 |
Correct |
4 ms |
7708 KB |
Output is correct |
| 24 |
Correct |
24 ms |
39352 KB |
Output is correct |
| 25 |
Correct |
24 ms |
39344 KB |
Output is correct |
| 26 |
Correct |
24 ms |
39420 KB |
Output is correct |
| 27 |
Correct |
25 ms |
39252 KB |
Output is correct |
| 28 |
Correct |
17 ms |
23760 KB |
Output is correct |
