#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll dp[3010][3010];
const ll mod = 1'000'000'007;
ll f(ll w, ll h){
if(!w || !h) return 1;
if(w<0 || h<0) return 0;
if(dp[w][h]) return dp[w][h];
ll ret = 0;
ret += f(w, h-1);
(ret += w * 4 * f(w-1, h-1) % mod) %= mod;
(ret += w*(w-1)/2 % mod * f(w-2, h-1) % mod) %= mod;
(ret += w * (h-1) % mod * f(w-1, h-2) % mod) %= mod;
return dp[w][h]=ret;
}
int main()
{
int n, m; cin >> n >> m;
cout << (f(n, m) + mod - 1) % mod << endl;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
484 KB |
Output is correct |
| 3 |
Correct |
2 ms |
540 KB |
Output is correct |
| 4 |
Correct |
2 ms |
672 KB |
Output is correct |
| 5 |
Correct |
4 ms |
980 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1348 KB |
Output is correct |
| 7 |
Correct |
4 ms |
1348 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1348 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1348 KB |
Output is correct |
| 10 |
Correct |
5 ms |
1920 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1920 KB |
Output is correct |
| 12 |
Correct |
8 ms |
2456 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
484 KB |
Output is correct |
| 3 |
Correct |
2 ms |
540 KB |
Output is correct |
| 4 |
Correct |
2 ms |
672 KB |
Output is correct |
| 5 |
Correct |
4 ms |
980 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1348 KB |
Output is correct |
| 7 |
Correct |
4 ms |
1348 KB |
Output is correct |
| 8 |
Correct |
4 ms |
1348 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1348 KB |
Output is correct |
| 10 |
Correct |
5 ms |
1920 KB |
Output is correct |
| 11 |
Correct |
3 ms |
1920 KB |
Output is correct |
| 12 |
Correct |
8 ms |
2456 KB |
Output is correct |
| 13 |
Correct |
3 ms |
2456 KB |
Output is correct |
| 14 |
Correct |
2 ms |
2456 KB |
Output is correct |
| 15 |
Correct |
376 ms |
40844 KB |
Output is correct |
| 16 |
Correct |
23 ms |
40844 KB |
Output is correct |
| 17 |
Correct |
76 ms |
40844 KB |
Output is correct |
| 18 |
Correct |
94 ms |
40844 KB |
Output is correct |
| 19 |
Correct |
421 ms |
47084 KB |
Output is correct |
| 20 |
Correct |
350 ms |
47084 KB |
Output is correct |
| 21 |
Correct |
223 ms |
47084 KB |
Output is correct |
| 22 |
Correct |
225 ms |
47084 KB |
Output is correct |
| 23 |
Correct |
33 ms |
47084 KB |
Output is correct |
| 24 |
Correct |
664 ms |
63996 KB |
Output is correct |
| 25 |
Correct |
463 ms |
63996 KB |
Output is correct |
| 26 |
Correct |
481 ms |
63996 KB |
Output is correct |
| 27 |
Correct |
668 ms |
63996 KB |
Output is correct |
