#include<iostream>
using namespace std;
long long d[3002][3002], n, m;
long long mod = 1000000007;
int main()
{
cin >> n >> m;
for (int i = 1; i <= n; i++)
{
d[i][0] = 1;
d[i][1] = i*(i - 1) / 2 + 4 * i + 1;
}
for (int i = 1; i <= m; i++)
{
d[0][i] = 1;
d[1][i] = (i*(i - 1) / 2 + 4 * i + 1) % mod;
}
for (long long i = 2; i <= n; i++)
{
for (long long j = 2; j <= m; j++)
{
d[i][j] = ((i*(i - 1) / 2) * d[i - 2][j - 1] + i * 4 * d[i - 1][j - 1] + i*(j - 1)*d[i - 1][j - 2] + d[i][j - 1]) % mod;
}
}
cout << (d[n][m] - 1 + mod) % mod << endl;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
248 KB |
Output is correct |
| 2 |
Correct |
2 ms |
356 KB |
Output is correct |
| 3 |
Correct |
2 ms |
560 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1612 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1612 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1644 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1644 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2040 KB |
Output is correct |
| 11 |
Correct |
2 ms |
2040 KB |
Output is correct |
| 12 |
Correct |
5 ms |
2412 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
248 KB |
Output is correct |
| 2 |
Correct |
2 ms |
356 KB |
Output is correct |
| 3 |
Correct |
2 ms |
560 KB |
Output is correct |
| 4 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 5 |
Correct |
3 ms |
1364 KB |
Output is correct |
| 6 |
Correct |
3 ms |
1612 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1612 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1644 KB |
Output is correct |
| 9 |
Correct |
3 ms |
1644 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2040 KB |
Output is correct |
| 11 |
Correct |
2 ms |
2040 KB |
Output is correct |
| 12 |
Correct |
5 ms |
2412 KB |
Output is correct |
| 13 |
Correct |
2 ms |
2412 KB |
Output is correct |
| 14 |
Correct |
9 ms |
9964 KB |
Output is correct |
| 15 |
Correct |
174 ms |
55464 KB |
Output is correct |
| 16 |
Correct |
13 ms |
55464 KB |
Output is correct |
| 17 |
Correct |
39 ms |
55464 KB |
Output is correct |
| 18 |
Correct |
48 ms |
55464 KB |
Output is correct |
| 19 |
Correct |
195 ms |
63296 KB |
Output is correct |
| 20 |
Correct |
157 ms |
63296 KB |
Output is correct |
| 21 |
Correct |
104 ms |
63296 KB |
Output is correct |
| 22 |
Correct |
100 ms |
63296 KB |
Output is correct |
| 23 |
Correct |
64 ms |
63296 KB |
Output is correct |
| 24 |
Correct |
259 ms |
71108 KB |
Output is correct |
| 25 |
Correct |
196 ms |
71108 KB |
Output is correct |
| 26 |
Correct |
219 ms |
71108 KB |
Output is correct |
| 27 |
Correct |
247 ms |
71108 KB |
Output is correct |
