#include <bits/stdc++.h>
using namespace std;
const int N = 3e3 + 1;
typedef long long ll;
int n, k;
ll d[N][N], base = 1e9 + 7;
int main()
{
cin >> n >> k;
for (int i = 1; i <= n; ++i) d[i][0] = 1;
for (int i = 1; i <= n; ++i)
for (int j = 1; j < i; ++j)
d[i][j] = ((i - j)*d[i - 1][j - 1] + (j + 1)*(d[i - 1][j])) % base;
cout << d[n][k - 1];
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
504 KB |
Output is correct |
| 2 |
Correct |
3 ms |
592 KB |
Output is correct |
| 3 |
Correct |
2 ms |
592 KB |
Output is correct |
| 4 |
Correct |
2 ms |
592 KB |
Output is correct |
| 5 |
Correct |
2 ms |
620 KB |
Output is correct |
| 6 |
Correct |
3 ms |
620 KB |
Output is correct |
| 7 |
Correct |
3 ms |
732 KB |
Output is correct |
| 8 |
Correct |
3 ms |
732 KB |
Output is correct |
| 9 |
Correct |
3 ms |
732 KB |
Output is correct |
| 10 |
Correct |
2 ms |
744 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
504 KB |
Output is correct |
| 2 |
Correct |
3 ms |
592 KB |
Output is correct |
| 3 |
Correct |
2 ms |
592 KB |
Output is correct |
| 4 |
Correct |
2 ms |
592 KB |
Output is correct |
| 5 |
Correct |
2 ms |
620 KB |
Output is correct |
| 6 |
Correct |
3 ms |
620 KB |
Output is correct |
| 7 |
Correct |
3 ms |
732 KB |
Output is correct |
| 8 |
Correct |
3 ms |
732 KB |
Output is correct |
| 9 |
Correct |
3 ms |
732 KB |
Output is correct |
| 10 |
Correct |
2 ms |
744 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1148 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2300 KB |
Output is correct |
| 13 |
Correct |
5 ms |
2320 KB |
Output is correct |
| 14 |
Correct |
5 ms |
2320 KB |
Output is correct |
| 15 |
Correct |
4 ms |
2368 KB |
Output is correct |
| 16 |
Correct |
5 ms |
2372 KB |
Output is correct |
| 17 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 18 |
Correct |
4 ms |
2372 KB |
Output is correct |
| 19 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 20 |
Correct |
3 ms |
2372 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
504 KB |
Output is correct |
| 2 |
Correct |
3 ms |
592 KB |
Output is correct |
| 3 |
Correct |
2 ms |
592 KB |
Output is correct |
| 4 |
Correct |
2 ms |
592 KB |
Output is correct |
| 5 |
Correct |
2 ms |
620 KB |
Output is correct |
| 6 |
Correct |
3 ms |
620 KB |
Output is correct |
| 7 |
Correct |
3 ms |
732 KB |
Output is correct |
| 8 |
Correct |
3 ms |
732 KB |
Output is correct |
| 9 |
Correct |
3 ms |
732 KB |
Output is correct |
| 10 |
Correct |
2 ms |
744 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1148 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2300 KB |
Output is correct |
| 13 |
Correct |
5 ms |
2320 KB |
Output is correct |
| 14 |
Correct |
5 ms |
2320 KB |
Output is correct |
| 15 |
Correct |
4 ms |
2368 KB |
Output is correct |
| 16 |
Correct |
5 ms |
2372 KB |
Output is correct |
| 17 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 18 |
Correct |
4 ms |
2372 KB |
Output is correct |
| 19 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 20 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 21 |
Correct |
15 ms |
8796 KB |
Output is correct |
| 22 |
Correct |
16 ms |
8816 KB |
Output is correct |
| 23 |
Correct |
17 ms |
8816 KB |
Output is correct |
| 24 |
Correct |
16 ms |
8816 KB |
Output is correct |
| 25 |
Correct |
16 ms |
8828 KB |
Output is correct |
| 26 |
Correct |
16 ms |
8828 KB |
Output is correct |
| 27 |
Correct |
15 ms |
8828 KB |
Output is correct |
| 28 |
Correct |
7 ms |
8828 KB |
Output is correct |
| 29 |
Correct |
3 ms |
8828 KB |
Output is correct |
| 30 |
Correct |
13 ms |
8828 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
504 KB |
Output is correct |
| 2 |
Correct |
3 ms |
592 KB |
Output is correct |
| 3 |
Correct |
2 ms |
592 KB |
Output is correct |
| 4 |
Correct |
2 ms |
592 KB |
Output is correct |
| 5 |
Correct |
2 ms |
620 KB |
Output is correct |
| 6 |
Correct |
3 ms |
620 KB |
Output is correct |
| 7 |
Correct |
3 ms |
732 KB |
Output is correct |
| 8 |
Correct |
3 ms |
732 KB |
Output is correct |
| 9 |
Correct |
3 ms |
732 KB |
Output is correct |
| 10 |
Correct |
2 ms |
744 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1148 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2300 KB |
Output is correct |
| 13 |
Correct |
5 ms |
2320 KB |
Output is correct |
| 14 |
Correct |
5 ms |
2320 KB |
Output is correct |
| 15 |
Correct |
4 ms |
2368 KB |
Output is correct |
| 16 |
Correct |
5 ms |
2372 KB |
Output is correct |
| 17 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 18 |
Correct |
4 ms |
2372 KB |
Output is correct |
| 19 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 20 |
Correct |
3 ms |
2372 KB |
Output is correct |
| 21 |
Correct |
15 ms |
8796 KB |
Output is correct |
| 22 |
Correct |
16 ms |
8816 KB |
Output is correct |
| 23 |
Correct |
17 ms |
8816 KB |
Output is correct |
| 24 |
Correct |
16 ms |
8816 KB |
Output is correct |
| 25 |
Correct |
16 ms |
8828 KB |
Output is correct |
| 26 |
Correct |
16 ms |
8828 KB |
Output is correct |
| 27 |
Correct |
15 ms |
8828 KB |
Output is correct |
| 28 |
Correct |
7 ms |
8828 KB |
Output is correct |
| 29 |
Correct |
3 ms |
8828 KB |
Output is correct |
| 30 |
Correct |
13 ms |
8828 KB |
Output is correct |
| 31 |
Runtime error |
58 ms |
25364 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 32 |
Halted |
0 ms |
0 KB |
- |
