#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MOD = 1000000007;
const int MAXH = 3005;
const int MAXW = 3005;
int dp[MAXW][MAXH], ds[MAXW][MAXH], dks[MAXW][MAXH];
int H, W;
int main() {
for(int i = 0; i < MAXH; i++) dp[0][i] = dp[i][0] = 1;
for(int i = 0; i < MAXH; i++) ds[0][i] = i+1;
dks[0][0] = 1; for(int i = 1; i < MAXH; i++) dks[0][i] = (dks[0][i-1] + i+1) % MOD;
cin >> H >> W;
for(int w = 1; w <= W; w++) {
for(int h = 1; h <= H; h++) {
int &ret = dp[w][h];
ret = (ll(ds[w-1][h-1]) * w % MOD * 4 + ret) % MOD;
if(1 < h) ret = (ll(dks[w-1][h-2]) * w + ret) % MOD;
if(1 < w) ret = (ll(w) * (w-1) / 2 % MOD * ds[w-2][h-1] + ret) % MOD;
ret = (ret + 1) % MOD;
}
ds[w][0] = 1; for(int j = 1; j <= H; j++) ds[w][j] = (ds[w][j-1] + dp[w][j]) % MOD;
dks[w][0] = 1; for(int j = 1; j <= H; j++) dks[w][j] = (ll(dp[w][j]) * (j+1) + dks[w][j-1]) % MOD;
}
cout << ((dp[W][H] - 1 + MOD) % MOD) << endl;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
12544 KB |
Output is correct |
| 2 |
Correct |
8 ms |
13952 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12416 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12416 KB |
Output is correct |
| 5 |
Correct |
8 ms |
14592 KB |
Output is correct |
| 6 |
Correct |
8 ms |
13312 KB |
Output is correct |
| 7 |
Correct |
8 ms |
14464 KB |
Output is correct |
| 8 |
Correct |
8 ms |
13056 KB |
Output is correct |
| 9 |
Correct |
7 ms |
12416 KB |
Output is correct |
| 10 |
Correct |
9 ms |
14080 KB |
Output is correct |
| 11 |
Correct |
10 ms |
14848 KB |
Output is correct |
| 12 |
Correct |
12 ms |
15872 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
12544 KB |
Output is correct |
| 2 |
Correct |
8 ms |
13952 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12416 KB |
Output is correct |
| 4 |
Correct |
7 ms |
12416 KB |
Output is correct |
| 5 |
Correct |
8 ms |
14592 KB |
Output is correct |
| 6 |
Correct |
8 ms |
13312 KB |
Output is correct |
| 7 |
Correct |
8 ms |
14464 KB |
Output is correct |
| 8 |
Correct |
8 ms |
13056 KB |
Output is correct |
| 9 |
Correct |
7 ms |
12416 KB |
Output is correct |
| 10 |
Correct |
9 ms |
14080 KB |
Output is correct |
| 11 |
Correct |
10 ms |
14848 KB |
Output is correct |
| 12 |
Correct |
12 ms |
15872 KB |
Output is correct |
| 13 |
Correct |
15 ms |
27264 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12544 KB |
Output is correct |
| 15 |
Correct |
194 ms |
75664 KB |
Output is correct |
| 16 |
Correct |
27 ms |
29176 KB |
Output is correct |
| 17 |
Correct |
59 ms |
41504 KB |
Output is correct |
| 18 |
Correct |
66 ms |
41336 KB |
Output is correct |
| 19 |
Correct |
223 ms |
82428 KB |
Output is correct |
| 20 |
Correct |
184 ms |
78968 KB |
Output is correct |
| 21 |
Correct |
133 ms |
69240 KB |
Output is correct |
| 22 |
Correct |
127 ms |
61432 KB |
Output is correct |
| 23 |
Correct |
69 ms |
31992 KB |
Output is correct |
| 24 |
Correct |
305 ms |
106232 KB |
Output is correct |
| 25 |
Correct |
230 ms |
93036 KB |
Output is correct |
| 26 |
Correct |
259 ms |
97272 KB |
Output is correct |
| 27 |
Correct |
289 ms |
104972 KB |
Output is correct |
