#include <bits/stdc++.h>
using namespace std;
const int N = 3e3 + 1;
typedef long long ll;
int h, w;
ll d[N][N], f[N][N];
ll base = 1e9 + 7;
ll p(int n, int m)
{
if (n*m == 0) return 1;
if (d[n][m] != -1) return d[n][m];
ll res = 0;
res = (res + 4*m*p(n - 1, m - 1)) % base;
res = (res + p(n - 1, m)) % base;
if (m >= 2) res = (res + m*(m - 1)/2*p(n - 1, m - 2)) % base;
if (n >= 2) res = (res + (n - 1)*m*p(n - 2, m - 1)) % base;
d[n][m] = res;
return res;
}
int main()
{
cin >> h >> w;
memset(d, -1, sizeof(d));
//memset(f, -1, sizeof(f));
//cout << p(h, w) <<' ' << p1(h, w) << endl;
cout << p(h, w) - 1;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
52 ms |
70776 KB |
Output is correct |
| 2 |
Correct |
51 ms |
71004 KB |
Output is correct |
| 3 |
Correct |
60 ms |
71004 KB |
Output is correct |
| 4 |
Correct |
55 ms |
71004 KB |
Output is correct |
| 5 |
Correct |
52 ms |
71096 KB |
Output is correct |
| 6 |
Correct |
54 ms |
71096 KB |
Output is correct |
| 7 |
Correct |
52 ms |
71228 KB |
Output is correct |
| 8 |
Correct |
53 ms |
71228 KB |
Output is correct |
| 9 |
Correct |
52 ms |
71276 KB |
Output is correct |
| 10 |
Correct |
59 ms |
71276 KB |
Output is correct |
| 11 |
Correct |
51 ms |
71276 KB |
Output is correct |
| 12 |
Correct |
62 ms |
71276 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
52 ms |
70776 KB |
Output is correct |
| 2 |
Correct |
51 ms |
71004 KB |
Output is correct |
| 3 |
Correct |
60 ms |
71004 KB |
Output is correct |
| 4 |
Correct |
55 ms |
71004 KB |
Output is correct |
| 5 |
Correct |
52 ms |
71096 KB |
Output is correct |
| 6 |
Correct |
54 ms |
71096 KB |
Output is correct |
| 7 |
Correct |
52 ms |
71228 KB |
Output is correct |
| 8 |
Correct |
53 ms |
71228 KB |
Output is correct |
| 9 |
Correct |
52 ms |
71276 KB |
Output is correct |
| 10 |
Correct |
59 ms |
71276 KB |
Output is correct |
| 11 |
Correct |
51 ms |
71276 KB |
Output is correct |
| 12 |
Correct |
62 ms |
71276 KB |
Output is correct |
| 13 |
Correct |
52 ms |
71276 KB |
Output is correct |
| 14 |
Correct |
52 ms |
71312 KB |
Output is correct |
| 15 |
Correct |
535 ms |
71396 KB |
Output is correct |
| 16 |
Correct |
57 ms |
71396 KB |
Output is correct |
| 17 |
Correct |
96 ms |
71396 KB |
Output is correct |
| 18 |
Correct |
158 ms |
71396 KB |
Output is correct |
| 19 |
Correct |
634 ms |
71460 KB |
Output is correct |
| 20 |
Correct |
515 ms |
71460 KB |
Output is correct |
| 21 |
Correct |
296 ms |
71472 KB |
Output is correct |
| 22 |
Correct |
338 ms |
71472 KB |
Output is correct |
| 23 |
Correct |
244 ms |
71480 KB |
Output is correct |
| 24 |
Correct |
828 ms |
71572 KB |
Output is correct |
| 25 |
Correct |
642 ms |
71572 KB |
Output is correct |
| 26 |
Correct |
690 ms |
71572 KB |
Output is correct |
| 27 |
Correct |
747 ms |
71572 KB |
Output is correct |
